Release version 2.5.0

It turns out that we can allow udev access to any USB hub using DRIVER=="hub"
udev filter, this should make it easier for linux ditros to add proper udev rules.

This change adds more documentation to README, and also adds ready to use udev rule
that should work for any USB hub and any Linux kernel version.

.gitignore

@@ -6,3 +6,7 @@ uhubctl
 
 # Mac symbols
 *.dSYM
+
+# Patches
+*.patch
+*.diff

Formula/uhubctl.rb

@@ -2,8 +2,8 @@ class Uhubctl < Formula
   desc "USB hub per-port power control"
   homepage "https://github.com/mvp/uhubctl"
   head "https://github.com/mvp/uhubctl.git"
-  url "https://github.com/mvp/uhubctl/archive/v2.3.0.tar.gz"
-  sha256 "714f733592d3cb6ba8efc84fbc03b1beed2323918ff33aef01cdb956755be7b7"
+  url "https://github.com/mvp/uhubctl/archive/v2.4.0.tar.gz"
+  sha256 "391f24fd1f89cacce801df38ecc289b34c3627bc08ee69eec515af7e1a283d97"
   license "GPL-2.0"
 
   depends_on "libusb"

LICENSE

@@ -1,6 +1,6 @@
 uhubctl – USB hub per-port power control.
 
-Copyright (c) 2009-2020, Vadim Mikhailov
+Copyright (c) 2009-2022, Vadim Mikhailov
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by

README.md

@@ -20,10 +20,13 @@ This is list of known compatible USB hubs:
 |:-------------------|:-----------------------------------------------------|:------|:----|:----------|:--------|:-----|
 | AmazonBasics       | HU3641V1 ([RPi issue](https://goo.gl/CLt46M))        | 4     | 3.0 |`2109:2811`| 2013    |      |
 | AmazonBasics       | HU3770V1 ([RPi issue](https://goo.gl/CLt46M))        | 7     | 3.0 |`2109:2811`| 2013    |      |
-| AmazonBasics       | HU9003V1EBL                                          | 7     | 3.1 |`2109:2817`| 2018    |      |
-| AmazonBasics       | HU9002V1SBL, HU9002V1ESL                             | 10    | 3.1 |`2109:2817`| 2018    |      |
+| AmazonBasics       | HU9003V1EBL, HUC9003V1EBL                            | 7     | 3.1 |`2109:2817`| 2018    |      |
+| AmazonBasics       | HU9002V1SBL, HU9002V1EBL, HU9002V1ESL ([note](https://bit.ly/3awM2Ei)) | 10    | 3.1 |`2109:2817`| 2018    |      |
 | AmazonBasics       | HUC9002V1SBL, HUC9002V1EBL, HUC9002V1ESL             | 10    | 3.1 |`2109:2817`| 2018    |      |
+| AmazonBasics       | U3-7HUB (only works for 1 charge port)               | 7     | 3.0 |`2109:2813`| 2020    |      |
+| Anker              | AK-A83650A1 ([note](https://git.io/JzpPb))           | 4     | 3.1 |`2109:0817`| 2020    |      |
 | Anker              | AK-68ANHUB-BV7A-0004 ([note](https://git.io/JLnZb))  | 7     | 3.0 |`2109:0812`| 2014    |      |
+| Apple              | Pro Display XDR MWPE2LL/A (internal USB hub)         | 4     | 2.0 |`05AC:9139`| 2019    |      |
 | Apple              | Thunderbolt Display 27" (internal USB hub)           | 6     | 2.0 |           | 2011    | 2016 |
 | Apple              | USB Keyboard With Numeric Pad (internal USB hub)     | 3     | 2.0 |           | 2011    |      |
 | Asus               | Z87-PLUS Motherboard (onboard USB hub)               | 4     | 3.0 |           | 2013    | 2016 |
@@ -32,55 +35,78 @@ This is list of known compatible USB hubs:
 | B+B SmartWorx      | USH304                                               | 4     | 3.0 |`04B4:6506`| 2017    |      |
 | Basler             | 2000036234                                           | 4     | 3.0 |`0451:8046`| 2016    |      |
 | Belkin             | F5U101                                               | 4     | 2.0 |`0451:2046`| 2005    | 2010 |
+| BenQ               | PD2700U 4K Monitor (works only in USB2 mode)         | 4     | 3.1 |`05E3:0610`| 2018    |      |
+| BenQ               | PD3220U                                              | 4     | 3.1 |`05E3:0610`| 2019    |      |
 | Buffalo            | BSH4A05U3BK                                          | 4     | 3.0 |`05E3:0610`| 2015    |      |
-| Bytecc             | BT-UH340                                             | 4     | 3.0 |`2109:8110`| 2010    |      |
+| Bytecc             | BT-UH340 ([warning](https://bit.ly/35BNi5U))         | 4     | 3.0 |`2109:8110`| 2010    |      |
+| Centech            | CT-USB4HUB ReTRY HUB                                 | 4     | 3.1 |`0424:2744`| 2017    |      |
 | Circuitco          | Beagleboard-xM (internal USB hub)                    | 4     | 2.0 |`0424:9514`| 2010    |      |
 | Club3D             | CSV-3242HD Dual Display Docking Station              | 4     | 3.0 |`2109:2811`| 2015    |      |
 | CyberPower         | CP-H420P                                             | 4     | 2.0 |`0409:0059`| 2004    |      |
-| Cypress            | CY4608 HX2VL development kit                         | 4     | 2.0 |`04B4:6570`| 2012    |      |
-| D-Link             | DUB-H4 rev B (silver). Note: rev B7+ not supported   | 4     | 2.0 |`05E3:0605`| 2005    | 2010 |
+| Cypress            | CY4608 HX2VL devkit ([note](https://bit.ly/3sMPfpu)) | 4     | 2.0 |`04B4:6570`| 2012    |      |
 | D-Link             | DUB-H4 rev D,E (black). Note: rev A,C,F not supported| 4     | 2.0 |`05E3:0608`| 2012    |      |
 | D-Link             | DUB-H7 rev A (silver)                                | 7     | 2.0 |`2001:F103`| 2005    | 2010 |
-| D-Link             | DUB-H7 rev D,E (black). Note: rev B,C,F not supported| 7     | 2.0 |`05E3:0608`| 2012    |      |
+| D-Link             | DUB-H7 rev D,E (black). Rev B,C,F,G not supported    | 7     | 2.0 |`05E3:0608`| 2012    |      |
 | Dell               | P2416D 24" QHD Monitor ([note](https://git.io/JUAu8))| 4     | 2.0 |           | 2017    |      |
 | Dell               | S2719DGF 27" WQHD Gaming-Monitor                     | 5     | 3.1 |`0424:5734`| 2018    |      |
 | Dell               | UltraSharp 1704FPT 17" LCD Monitor                   | 4     | 2.0 |`0424:A700`| 2005    | 2015 |
 | Dell               | UltraSharp U2415 24" LCD Monitor                     | 5     | 3.0 |           | 2014    |      |
+| Dell               | UltraSharp U3419W 34" Curved Monitor                 | 6     | 3.0 |           | 2020    |      |
+| Delock             | 62537                                                | 4     | 3.1 |           | 2020    |      |
+| Delock             | 87445 ([note](https://git.io/Jsuz5))                 | 4     | 2.0 |`05E3:0608`| 2009    | 2013 |
 | Elecom             | U2H-G4S                                              | 4     | 2.0 |           | 2006    | 2011 |
 | ExSys              | EX-1113HMS                                           | 16    | 3.1 |           | 2018    |      |
 | GlobalScale        | ESPRESSObin SBUD102 V5                               | 1     | 3.0 |`1D6B:0003`| 2017    |      |
+| Hardkernel         | ODROID-C4 ([note](https://git.io/JG0mP))             | 4     | 3.0 |           | 2020    |      |
 | Hawking Technology | UH214                                                | 4     | 2.0 |           | 2003    | 2008 |
+| Hewlett Packard    | USB-C Dock G5 5TW10AA                                | 5     | 3.0 |`03F0:076B`| 2019    |      |
+| Hewlett Packard    | P5Q58UT                                              | 3     | 3.0 |           | 2019    |      |
+| Inateck            | HB2025A ([USB2 only](https://bit.ly/3wXF5UO))        | 4     | 3.1 |`2109:2822`| 2021    |      |
 | IOI                | U3H415E1                                             | 4     | 3.0 |           | 2012    |      |
-| j5create           | JUH470 (works only in USB2 mode)                     | 3     | 3.0 |`05E3:0610`| 2014    |      |
+| j5create           | JUH377 ([note](https://bit.ly/3Mx9eQI))              | 7     | 3.0 |           | 2016    |      |
+| j5create           | JUH470 ([note](https://bit.ly/3CRWamP))              | 3     | 3.0 |`05E3:0610`| 2014    |      |
 | Juiced Systems     | 6HUB-01                                              | 7     | 3.0 |`0BDA:0411`| 2014    | 2018 |
+| LG Electronics     | 27MD5KL-B monitor                                    | 4     | 3.1 |`043E:9A60`| 2019    |      |
+| LG Electronics     | 27UK850-W monitor                                    | 2     | 3.0 |           | 2018    |      |
 | LG Electronics     | 38WK95C-W monitor                                    | 4     | 3.0 |`0451:8142`| 2018    |      |
 | Lenovo             | ThinkPad Ultra Docking Station (40A20090EU)          | 6     | 2.0 |`17EF:100F`| 2015    |      |
 | Lenovo             | ThinkPad Ultra Docking Station (40AJ0135EU)          | 7     | 3.1 |`17EF:3070`| 2018    |      |
 | Lenovo             | ThinkPad X200 Ultrabase 42X4963                      | 3     | 2.0 |`17EF:1005`| 2008    | 2011 |
 | Lenovo             | ThinkPad X6 Ultrabase 42W3107                        | 4     | 2.0 |`17EF:1000`| 2006    | 2009 |
+| Lenovo             | ThinkPlus 4-in-1 USB-C hub 4X90W86497                | 3     | 3.0 |           | 2021    |      |
+| Lenovo             | ThinkVision T24i-10 Monitor                          | 4     | 2.0 |`17EF:0610`| 2018    |      |
 | Lindy              | USB serial converter 4 port                          | 4     | 1.1 |`058F:9254`| 2008    |      |
-| Linksys            | USB2HUB4                                             | 4     | 2.0 |           | 2004    | 2010 |
+| Linksys            | USB2HUB4 ([note](https://git.io/JYiDZ))              | 4     | 2.0 |           | 2004    | 2010 |
 | Maplin             | A08CQ                                                | 7     | 2.0 |`0409:0059`| 2008    | 2011 |
 | Microchip          | EVB-USB2517                                          | 7     | 2.0 |           | 2008    |      |
 | Microchip          | EVB-USB2534BC                                        | 4     | 2.0 |           | 2013    |      |
+| Microchip          | EVB-USB5807                                          | 7     | 3.1 |           | 2016    |      |
 | Moxa               | Uport-407                                            | 7     | 2.0 |`110A:0407`| 2009    |      |
 | NVidia             | Jetson Nano B01 ([details](https://git.io/JJaFR))    | 4     | 3.0 |           | 2019    |      |
+| NVidia             | Jetson Xavier NX ([details](https://bit.ly/3PN2DDp)) | 4     | 3.0 |           | 2020    |      |
 | Phidgets           | HUB0003_0                                            | 7     | 2.0 |`1A40:0201`| 2017    |      |
 | Plugable           | USB3-HUB7BC                                          | 7     | 3.0 |`2109:0813`| 2015    |      |
-| Plugable           | USB3-HUB7C                                           | 7     | 3.0 |`2109:0813`| 2015    |      |
-| Plugable           | USB3-HUB7-81X                                        | 7     | 3.0 |`2109:0813`| 2012    |      |
+| Plugable           | USB3-HUB7C (only works for 2 charge ports)           | 7     | 3.0 |`2109:0813`| 2015    |      |
+| Plugable           | USBC-HUB7BC (works for 6/7 ports, not the rightmost) | 7     | 3.0 |`2109:0817`| 2021    |      |
+| Plugable           | USB3-HUB7-81X (only works for 2 charge ports)        | 7     | 3.0 |`2109:0813`| 2012    |      |
+| Plugable           | USB3-HUB10-C2 (only works for 2 charge ports)        | 10    | 3.0 |           | 2014    |      |
 | Port Inc           | NWUSB01                                              | 4     | 1.1 |`0451:1446`| 1999    | 2003 |
 | Raspberry Pi       | B+, 2B, 3B ([see below](#raspberry-pi-b2b3b))        | 4     | 2.0 |           | 2011    |      |
 | Raspberry Pi       | 3B+        ([see below](#raspberry-pi-3b))           | 4     | 2.0 |`0424:2514`| 2018    |      |
 | Raspberry Pi       | 4B         ([see below](#raspberry-pi-4b))           | 4     | 3.0 |`2109:3431`| 2019    |      |
 | Renesas            | uPD720202 PCIe USB 3.0 host controller               | 2     | 3.0 |           | 2013    |      |
 | Rosewill           | RHUB-210                                             | 4     | 2.0 |`0409:005A`| 2011    | 2014 |
-| Rosonway           | RSH-A16 ([note](https://git.io/JTawg))               | 16    | 3.2 |`0bda:0411`| 2020    |      |
+| Rosonway           | RSH-518C ([note](https://bit.ly/3kYZUsA))            | 7     | 3.0 |`2109:0817`| 2021    |      |
+| Rosonway           | RSH-A13 ([warning](https://bit.ly/3OToUOL))          | 13    | 3.1 |`2109:2822`| 2021    |      |
+| Rosonway           | RSH-A16 ([note](https://git.io/JTawg), [warning](https://bit.ly/39B0tGS)) | 16    | 3.0 |`0bda:0411`| 2020    |      |
+| Rosonway           | RSH-A104 ([USB2 only](https://bit.ly/3A0qiKF))       | 4     | 3.1 |`2109:2822`| 2022    |      |
 | Sanwa Supply       | USB-HUB14GPH                                         | 4     | 1.1 |           | 2001    | 2003 |
 | Seagate            | Backup Plus Hub STEL8000100                          | 2     | 3.0 |`0BC2:AB44`| 2016    |      |
+| Seeed Studio       | reTerminal CM4104032                                 | 2     | 2.0 |`0424:2514`| 2021    |      |
 | Sunix              | SHB4200MA                                            | 4     | 2.0 |`0409:0058`| 2006    | 2009 |
 | Targus             | PAUH212/PAUH212U                                     | 7     | 2.0 |           | 2004    | 2009 |
 | Texas Instruments  | TUSB4041PAPEVM                                       | 4     | 2.1 |`0451:8142`| 2015    |      |
+| UUGear             | MEGA4 (for Raspberry Pi 4B)                          | 4     | 3.1 |`2109:0817`| 2021    |      |
 
 This table is by no means complete.
 If your hub works with `uhubctl`, but is not listed above, please report it
@@ -112,6 +138,9 @@ Compiling
 This utility was tested to compile and work on Linux
 (Ubuntu/Debian, Redhat/Fedora/CentOS, Arch Linux, Gentoo, openSUSE, Buildroot), FreeBSD, NetBSD, SunOS and MacOS.
 
+> :warning: MacOS 12.4 x86 has [USB stack bug](https://github.com/libusb/libusb/issues/1156) which breaks `uhubctl` operation.
+Solution is to upgrade to MacOS 12.5 which has this bug fixed.
+
 While `uhubctl` compiles on Windows, USB power switching does not work on Windows because `libusb`
 is using `winusb.sys` driver, which according to Microsoft does not support
 [necessary USB control requests](https://social.msdn.microsoft.com/Forums/sqlserver/en-US/f680b63f-ca4f-4e52-baa9-9e64f8eee101).
@@ -186,20 +215,35 @@ Linux USB permissions
 =====================
 
 On Linux, you should configure `udev` USB permissions (otherwise you will have to run it as root using `sudo uhubctl`).
-To fix USB permissions, first run `sudo uhubctl` and note all `vid:pid` for hubs you need to control.
-Then, add one or more udev rules like below to file `/etc/udev/rules.d/52-usb.rules` (replace 2001 with your vendor id):
 
-    SUBSYSTEM=="usb", ATTR{idVendor}=="2001", MODE="0666"
+Starting with Linux Kernel 6.0 there is a standard interface to turn USB hub ports on or off,
+and `uhubctl` will try to use it (instead of `libusb`) to set the port status.
+This is why there are additional rules for 6.0+ kernels.
+There is no harm in having these rules on systems running older kernel versions.
+
+To fix USB permissions, first run `sudo uhubctl` and note all `vid:pid` for hubs you need to control.
+Then, add udev rules like below to file `/etc/udev/rules.d/52-usb.rules`
+(replace `2001` with your hub vendor id, or completely remove `ATTR{idVendor}` filter to allow any USB hub access):
+
+    SUBSYSTEM=="usb", DRIVER=="hub", MODE="0666", ATTR{idVendor}=="2001"
+    # Linux 6.0 or later (its ok to have this block present for older Linux kernels):
+    SUBSYSTEM=="usb", DRIVER=="hub", \
+      RUN="/bin/sh -c \"chmod -f 666 $sys$devpath/*-port*/disable || true\""
 
 Note that for USB3 hubs, some hubs use different vendor ID for USB2 vs USB3 components of the same chip,
-and both need permissions to make uhubctl work properly. E.g. for Raspberry Pi 4B, you need to add these 2 lines:
+and both need permissions to make uhubctl work properly.
+E.g. for Raspberry Pi 4B, you need to add these 2 lines (or remove idVendor filter):
 
-    SUBSYSTEM=="usb", ATTR{idVendor}=="2109", MODE="0666"
-    SUBSYSTEM=="usb", ATTR{idVendor}=="1d6b", MODE="0666"
+    SUBSYSTEM=="usb", DRIVER=="hub", MODE="0666", ATTR{idVendor}=="2109"
+    SUBSYSTEM=="usb", DRIVER=="hub", MODE="0666", ATTR{idVendor}=="1d6b"
 
 If you don't like wide open mode `0666`, you can restrict access by group like this:
 
-    SUBSYSTEM=="usb", ATTR{idVendor}=="2001", MODE="0664", GROUP="dialout"
+    SUBSYSTEM=="usb", DRIVER=="hub", MODE="0664", GROUP="dialout"
+    # Linux 6.0 or later (its ok to have this block present for older Linux kernels):
+    SUBSYSTEM=="usb", DRIVER=="hub", \
+      RUN+="/bin/sh -c \"chown -f root:dialout $sys$devpath/*-port*/disable || true\"" \
+      RUN+="/bin/sh -c \"chmod -f 660 $sys$devpath/*-port*/disable || true\""
 
 and then add permitted users to `dialout` group:
 
@@ -209,6 +253,7 @@ For your `udev` rule changes to take effect, reboot or run:
 
     sudo udevadm trigger --attr-match=subsystem=usb
 
+For your convenience, ready to use udev rule is provided [here](https://github.com/mvp/uhubctl/blob/master/udev/rules.d/52-usb.rules).
 
 
 FAQ
@@ -264,6 +309,8 @@ Per-port power switching:
 
 #### _USB devices are not removed after port power down on Linux_
 
+> :arrow_right: This is fixed by [#450](https://github.com/mvp/uhubctl/pull/450) if you are using Linux kernel 6.0 or later.
+
 After powering down USB port, udev does not get any event, so it keeps the device files around.
 However, trying to access the device files will lead to an IO error.
 
@@ -282,6 +329,8 @@ When you turn power back on, device should re-enumerate properly (no need to cal
 
 #### _Power comes back on after few seconds on Linux_
 
+> :arrow_right: This is fixed by [#450](https://github.com/mvp/uhubctl/pull/450) if you are using Linux kernel 6.0 or later.
+
 Some device drivers in kernel are surprised by USB device being turned off and automatically try to power it back on.
 
 You can use option `-r N` where N is some number from 10 to 1000 to fix this -
@@ -314,6 +363,7 @@ Doing so will confuse internal hub circuitry and will cause unpredictable behavi
 This is the limitation of Raspberry Pi hardware design.
 As a workaround, you can buy any external USB hub from supported list above,
 attach it to any USB port of Raspberry Pi, and control power on its ports independently.
+Also, there are supported hubs designed specifically for Raspberry Pi, e.g. UUGear MEGA4.
 
 For reference, supported Raspberry Pi models have following internal USB topology:
 
@@ -378,12 +428,16 @@ Notable projects using uhubctl
 | [Raspberry Pi Reboot Router](https://bit.ly/3aNbQqs)     | Automatically reboot router if internet isn't working |
 | [Control USB Lamp With Voice](https://bit.ly/2VtW2SX)    | Voice Control of USB Lamp using Siri and Raspberry Pi |
 | [Control USB LED Strip](https://bit.ly/3oVWfeZ)          | Controlling USB powered LED Light Strip               |
+| [Brew beer with Raspberry Pi](https://git.io/JtbLd)      | Automated beer brewing system using Raspberry Pi      |
+| [Webcam On-Air Sign](https://bit.ly/3witNsa)             | Automatically light up a sign when webcam is in use   |
+| [Do it yourself PPPS](https://git.io/J3lHs)              | Solder wires in your USB hub to support uhubctl       |
+| [Python Wrapper for uhubctl](https://github.com/nbuchwitz/python3-uhubctl) | Module to use uhubctl with Python |
 
 
 Copyright
 =========
 
-Copyright (C) 2009-2020 Vadim Mikhailov
+Copyright (C) 2009-2022 Vadim Mikhailov
 
 This file can be distributed under the terms and conditions of the
 GNU General Public License version 2.

VERSION

@@ -1 +1 @@
-2.4.0
+2.5.0

udev/rules.d/52-usb.rules

@@ -0,0 +1,24 @@
+# uhubctl – USB hub per-port power control https://github.com/mvp/uhubctl
+#
+# Copyright (c) 2009-2022, Vadim Mikhailov
+#
+# This file can be distributed under the terms and conditions of the
+# GNU General Public License version 2.
+
+# uhubctl udev rules for rootless operation on Linux for users in group `dialout`.
+#
+# Copy this file to /etc/udev/rules.d, then reboot or run:
+#
+#   sudo udevadm trigger --attr-match=subsystem=usb
+#
+# To add yourself to this permission group, run:
+#
+#   sudo usermod -a -G dialout $USER
+
+# This is for Linux before 6.0:
+SUBSYSTEM=="usb", DRIVER=="hub", MODE="0664", GROUP="dialout"
+
+# This is for Linux 6.0 or later (ok to keep this block present for older Linux kernels):
+SUBSYSTEM=="usb", DRIVER=="hub", \
+  RUN+="/bin/sh -c \"chown -f root:dialout $sys$devpath/*-port*/disable || true\"" \
+  RUN+="/bin/sh -c \"chmod -f 660 $sys$devpath/*-port*/disable || true\""

uhubctl.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2020 Vadim Mikhailov
+ * Copyright (c) 2009-2022 Vadim Mikhailov
  *
  * Utility to turn USB port power on/off
  * for USB hubs that support per-port power switching.
@@ -47,6 +47,10 @@ int snprintf(char * __restrict __str, size_t __size, const char * __restrict __f
 #include <time.h>   /* for nanosleep */
 #endif
 
+#ifdef __gnu_linux__
+#include <fcntl.h> /* for open() / O_WRONLY */
+#endif
+
 /* cross-platform sleep function */
 
 void sleep_ms(int milliseconds)
@@ -221,6 +225,18 @@ static int opt_wait   = 20; /* wait before repeating in ms */
 static int opt_exact  = 0;  /* exact location match - disable USB3 duality handling */
 static int opt_reset  = 0;  /* reset hub after operation(s) */
 static int opt_force  = 0;  /* force operation even on unsupported hubs */
+static int opt_nodesc = 0;  /* skip querying device description */
+#ifdef __gnu_linux__
+static int opt_nosysfs = 0; /* don't use the Linux sysfs port disable interface, even if available */
+#endif
+
+
+static const char short_options[] =
+    "l:L:n:a:p:d:r:w:s:hvefRN"
+#ifdef __gnu_linux__
+    "S"
+#endif
+;
 
 static const struct option long_options[] = {
     { "location", required_argument, NULL, 'l' },
@@ -234,6 +250,10 @@ static const struct option long_options[] = {
     { "wait",     required_argument, NULL, 'w' },
     { "exact",    no_argument,       NULL, 'e' },
     { "force",    no_argument,       NULL, 'f' },
+    { "nodesc",   no_argument,       NULL, 'N' },
+#ifdef __gnu_linux__
+    { "nosysfs",  no_argument,       NULL, 'S' },
+#endif
     { "reset",    no_argument,       NULL, 'R' },
     { "version",  no_argument,       NULL, 'v' },
     { "help",     no_argument,       NULL, 'h' },
@@ -259,6 +279,10 @@ static int print_usage()
         "--repeat,   -r - repeat power off count [%d] (some devices need it to turn off).\n"
         "--exact,    -e - exact location (no USB3 duality handling).\n"
         "--force,    -f - force operation even on unsupported hubs.\n"
+        "--nodesc,   -N - do not query device description (helpful for unresponsive devices).\n"
+#ifdef __gnu_linux__
+        "--nosysfs,  -S - do not use the Linux sysfs port disable interface.\n"
+#endif
         "--reset,    -R - reset hub after each power-on action, causing all devices to reassociate.\n"
         "--wait,     -w - wait before repeat power off [%d ms].\n"
         "--version,  -v - print program version.\n"
@@ -504,6 +528,113 @@ static int get_port_status(struct libusb_device_handle *devh, int port)
 }
 
 
+#ifdef __gnu_linux__
+/*
+ * Try to use the Linux sysfs interface to power a port off/on.
+ * Returns 0 on success.
+ */
+
+static int set_port_status_linux(struct libusb_device_handle *devh, struct hub_info *hub, int port, int on)
+{
+    int configuration = 0;
+    char disable_path[PATH_MAX];
+
+    int rc = libusb_get_configuration(devh, &configuration);
+    if (rc < 0) {
+        return rc;
+    }
+
+    /*
+     * The "disable" sysfs interface is available only starting with kernel version 6.0.
+     * For earlier kernel versions the open() call will fail and we fall back to using libusb.
+     */
+    snprintf(disable_path, PATH_MAX,
+        "/sys/bus/usb/devices/%s:%d.0/%s-port%i/disable",
+        hub->location, configuration, hub->location, port
+    );
+
+    int disable_fd = open(disable_path, O_WRONLY);
+    if (disable_fd >= 0) {
+        rc = write(disable_fd, on ? "0" : "1", 1);
+        close(disable_fd);
+    }
+
+    if (disable_fd < 0 || rc < 0) {
+        /*
+         * ENOENT is the expected error when running on Linux kernel < 6.0 where
+         * sysfs disable interface does not exist yet - no need to report anything in this case.
+         * If the file exists but another error occurs it is most likely a permission issue.
+         * Print an error message mostly geared towards setting up udev.
+         */
+        if (errno != ENOENT) {
+            fprintf(stderr,
+                "Failed to set port status by writing to %s (%s).\n"
+                "Follow https://git.io/JIB2Z to make sure that udev is set up correctly.\n"
+                "Falling back to libusb based port control.\n"
+                "Use -S to skip trying the sysfs interface and printing this message.\n",
+                disable_path, strerror(errno)
+            );
+        }
+
+        return -1;
+    }
+
+    return 0;
+}
+#endif
+
+
+/*
+ * Use a control transfer via libusb to turn a port off/on.
+ * Returns >= 0 on success.
+ */
+
+static int set_port_status_libusb(struct libusb_device_handle *devh, int port, int on)
+{
+    int rc = 0;
+    int request = on ? LIBUSB_REQUEST_SET_FEATURE
+                     : LIBUSB_REQUEST_CLEAR_FEATURE;
+    int repeat = on ? 1 : opt_repeat;
+
+    while (repeat-- > 0) {
+        rc = libusb_control_transfer(devh,
+            LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_OTHER,
+            request, USB_PORT_FEAT_POWER,
+            port, NULL, 0, USB_CTRL_GET_TIMEOUT
+        );
+        if (rc < 0) {
+            perror("Failed to control port power!\n");
+        }
+        if (repeat > 0) {
+            sleep_ms(opt_wait);
+        }
+    }
+
+    return rc;
+}
+
+
+/*
+ * Try different methods to power a port off/on.
+ * Return >= 0 on success.
+ */
+
+static int set_port_status(struct libusb_device_handle *devh, struct hub_info *hub, int port, int on)
+{
+#ifdef __gnu_linux__
+    if (!opt_nosysfs) {
+        if (set_port_status_linux(devh, hub, port, on) == 0) {
+            return 0;
+        }
+    }
+#else
+    (void)hub;
+#endif
+
+    return set_port_status_libusb(devh, port, on);
+}
+
+
 /*
  * Get USB device descriptor strings and summary description.
  *
@@ -535,20 +666,22 @@ static int get_device_description(struct libusb_device * dev, struct descriptor_
     id_product = libusb_le16_to_cpu(desc.idProduct);
     rc = libusb_open(dev, &devh);
     if (rc == 0) {
-        if (desc.iManufacturer) {
-            libusb_get_string_descriptor_ascii(devh,
-                desc.iManufacturer, (unsigned char*)ds->vendor, sizeof(ds->vendor));
-            rtrim(ds->vendor);
-        }
-        if (desc.iProduct) {
-            libusb_get_string_descriptor_ascii(devh,
-                desc.iProduct, (unsigned char*)ds->product, sizeof(ds->product));
-            rtrim(ds->product);
-        }
-        if (desc.iSerialNumber) {
-            libusb_get_string_descriptor_ascii(devh,
-                desc.iSerialNumber, (unsigned char*)ds->serial, sizeof(ds->serial));
-            rtrim(ds->serial);
+        if (!opt_nodesc) {
+            if (desc.iManufacturer) {
+                rc = libusb_get_string_descriptor_ascii(devh,
+                    desc.iManufacturer, (unsigned char*)ds->vendor, sizeof(ds->vendor));
+                rtrim(ds->vendor);
+            }
+            if (rc >= 0 && desc.iProduct) {
+                rc = libusb_get_string_descriptor_ascii(devh,
+                    desc.iProduct, (unsigned char*)ds->product, sizeof(ds->product));
+                rtrim(ds->product);
+            }
+            if (rc >= 0 && desc.iSerialNumber) {
+                rc = libusb_get_string_descriptor_ascii(devh,
+                    desc.iSerialNumber, (unsigned char*)ds->serial, sizeof(ds->serial));
+                rtrim(ds->serial);
+            }
         }
         if (desc.bDeviceClass == LIBUSB_CLASS_HUB) {
             struct hub_info info;
@@ -899,8 +1032,7 @@ int main(int argc, char *argv[])
     int option_index = 0;
 
     for (;;) {
-        c = getopt_long(argc, argv, "l:L:n:a:p:d:r:w:s:hvefR",
-            long_options, &option_index);
+        c = getopt_long(argc, argv, short_options, long_options, &option_index);
         if (c == -1)
             break;  /* no more options left */
         switch (c) {
@@ -914,16 +1046,16 @@ int main(int argc, char *argv[])
             printf("\n");
             break;
         case 'l':
-            strncpy(opt_location, optarg, sizeof(opt_location));
+            snprintf(opt_location, sizeof(opt_location), "%s", optarg);
             break;
         case 'L':
             opt_level = atoi(optarg);
             break;
         case 'n':
-            strncpy(opt_vendor, optarg, sizeof(opt_vendor));
+            snprintf(opt_vendor, sizeof(opt_vendor), "%s", optarg);
             break;
         case 's':
-            strncpy(opt_search, optarg, sizeof(opt_search));
+            snprintf(opt_search, sizeof(opt_search), "%s", optarg);
             break;
         case 'p':
             if (!strcasecmp(optarg, "all")) { /* all ports is the default */
@@ -956,6 +1088,14 @@ int main(int argc, char *argv[])
         case 'f':
             opt_force = 1;
             break;
+        case 'N':
+            opt_nodesc = 1;
+            break;
+#ifdef __gnu_linux__
+        case 'S':
+            opt_nosysfs = 1;
+            break;
+#endif
         case 'e':
             opt_exact = 1;
             break;
@@ -1033,7 +1173,7 @@ int main(int argc, char *argv[])
             continue;
         if (k == 1 && opt_action == POWER_KEEP)
             continue;
-        // if toggle requested, do it only once when `k == 0`
+        /* if toggle requested, do it only once when `k == 0` */
         if (k == 1 && opt_action == POWER_TOGGLE)
             continue;
         int i;
@@ -1052,45 +1192,29 @@ int main(int argc, char *argv[])
             if (rc == 0) {
                 /* will operate on these ports */
                 int ports = ((1 << hubs[i].nports) - 1) & opt_ports;
-                int request = (k == 0) ? LIBUSB_REQUEST_CLEAR_FEATURE
-                                       : LIBUSB_REQUEST_SET_FEATURE;
+                int should_be_on = k;
+
                 int port;
                 for (port=1; port <= hubs[i].nports; port++) {
                     if ((1 << (port-1)) & ports) {
                         int port_status = get_port_status(devh, port);
                         int power_mask = hubs[i].super_speed ? USB_SS_PORT_STAT_POWER
                                                              : USB_PORT_STAT_POWER;
-                        int powered_on = port_status & power_mask;
+                        int is_on = (port_status & power_mask) != 0;
+
                         if (opt_action == POWER_TOGGLE) {
-                            request = powered_on ? LIBUSB_REQUEST_CLEAR_FEATURE
-                                                 : LIBUSB_REQUEST_SET_FEATURE;
+                            should_be_on = !is_on;
                         }
-                        if (k == 0 && !powered_on && opt_action != POWER_TOGGLE)
-                            continue;
-                        if (k == 1 && powered_on)
-                            continue;
-                        int repeat = powered_on ? opt_repeat : 1;
-                        while (repeat-- > 0) {
-                            rc = libusb_control_transfer(devh,
-                                LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_OTHER,
-                                request, USB_PORT_FEAT_POWER,
-                                port, NULL, 0, USB_CTRL_GET_TIMEOUT
-                            );
-                            if (rc < 0) {
-                                perror("Failed to control port power!\n");
-                            }
-                            if (repeat > 0) {
-                                sleep_ms(opt_wait);
-                            }
+
+                        if (is_on != should_be_on) {
+                            rc = set_port_status(devh, &hubs[i], port, should_be_on);
                         }
                     }
                 }
                 /* USB3 hubs need extra delay to actually turn off: */
                 if (k==0 && hubs[i].super_speed)
                     sleep_ms(150);
-                printf("Sent power %s request\n",
-                    request == LIBUSB_REQUEST_CLEAR_FEATURE ? "off" : "on"
-                );
+                printf("Sent power %s request\n", should_be_on ? "on" : "off");
                 printf("New status for hub %s [%s]\n",
                     hubs[i].location, hubs[i].ds.description
                 );