/uhubctl

uhubctl - USB hub per-port power control

Primary LanguageCOtherNOASSERTION

uhubctl

uhubctl is utility to control USB power per-port on smart USB hubs. Smart hub is defined as one that implements per-port power switching.

Original idea for this code was inspired by hub-ctrl.c by Niibe Yutaka: https://www.gniibe.org/development/ac-power-control-by-USB-hub

Compatible USB hubs

Note that very few hubs actually support per-port power switching. Some of them are no longer manufactured and can be hard to find.

This is list of known compatible USB hubs:

Manufacturer Product Ports USB VID:PID Release EOL
Acer BE270U monitor (see) 4 3.0 2109:2811 2016
AmazonBasics HU3641V1 (RPi issue) 4 3.0 2109:2811 2013
AmazonBasics HU3770V1 (RPi issue) 7 3.0 2109:2811 2013
AmazonBasics HU9003V1EBL, HUC9003V1EBL 7 3.1 2109:2817 2018
AmazonBasics HU9002V1SBL, HU9002V1EBL, HU9002V1ESL (note) 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-68ANHUB-BV7A-0004 (note) 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 Z77 Sabertooth Motherboard (onboard USB hub) 6 2.0 2012
Asus Z87-PLUS Motherboard (onboard USB hub) 4 3.0 2013 2016
Aukey CB-C59 4 3.0 2109:2813 2017
B+B SmartWorx UHR204 4 2.0 0856:DB00 2013
B+B SmartWorx USH304 4 3.0 04B4:6506 2017 2019
Basler 2000036234 4 3.0 0451:8046 2016
Belkin F5U101 4 2.0 0451:2046 2005 2010
Belkin F5U238UKCRL-MOB 4 2.0 0409:0059 2004 2010
BenQ PD2700U 4K Monitor (works only in USB2 mode) 4 3.0 05E3:0610 2018
BenQ PD3220U 4 3.1 05E3:0610 2019
Bytecc BT-UH340 (warning) 4 3.0 2109:8110 2010
Centech CT-USB4HUB ReTRY HUB 4 3.0 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
Coolgear USBG-12U2ML 12 2.0 05e3:0607 2015
Cypress CY4608 HX2VL devkit (note) 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). Rev B,C,F,G not supported 7 2.0 05E3:0608 2012
Dell P2416D 24" QHD Monitor (note) 4 2.0 2017
Dell S2719DGF 27" WQHD Gaming-Monitor 5 3.0 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
Dell Wyse 3040 (-f required) 6 3.0 2017
Delock 62537 4 3.0 2017 2021
Delock 87445 (note) 4 2.0 05E3:0608 2009 2013
Elecom U2H-G4S 4 2.0 2006 2011
Gigabyte G27Q monitor (see 4 3.0 2109:0817 2020
GlobalScale ESPRESSObin SBUD102 V5 1 3.0 1D6B:0003 2017
Hardkernel ODROID-C4 (note) 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) 4 3.1 2109:2822 2021
IOI U3H415E1 4 3.0 2012
j5create JUH377 (note) 7 3.0 2016
j5create JUH470 (note) 3 3.0 05E3:0610 2014
Juiced Systems 6HUB-01 7 3.0 0BDA:0411 2014 2018
KUNBUS GmbH RevPi Connect (+) / S / SE 2 2.0 0424:9514 2018
KUNBUS GmbH RevPi Connect 4 2 3.0 2022
KUNBUS GmbH RevPi Core 3 / S / SE 2 2.0 0424:9514 2017
LG Electronics 27MD5KL-B monitor 4 3.0 043E:9A60 2019
LG Electronics 27GL850-B monitor 4 3.0 0451:8142 2019
LG Electronics 27UK850-W monitor 2 3.0 2018
LG Electronics 27UN83A-W monitor 2 3.0 0451:8142 2020
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
Lenovo USB-C to 4 Port USB-A Hub 4 2.0 17EF:103A 2020
Lindy USB serial converter 4 port 4 1.1 058F:9254 2008
Linksys USB2HUB4 (note) 4 2.0 2004 2010
Maplin A08CQ 7 2.0 0409:0059 2008 2011
Metadot Das Keyboard 4 2 3.0 2014
Microchip EVB9512 2 2.0 2009
Microchip EVB-USB2517 7 2.0 2008
Microchip EVB-USB2534BC 4 2.0 2013
Microchip EVB-USB5807 7 3.0 2016
Moxa Uport-407 7 2.0 110A:0407 2009
NVidia Jetson Nano B01 (details) 4 3.0 2019
NVidia Jetson Xavier NX (details) 4 3.0 2020
Phidgets HUB0003_0 7 2.0 1A40:0201 2017
Philips 346B1C UltraWide 34" Curved Monitor 4 3.0 05E3:0610 2019
Plugable USB3-HUB7BC 7 3.0 2109:0813 2015
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-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) 4 2.0 2011
Raspberry Pi 3B+ (see below) 4 2.0 0424:2514 2018
Raspberry Pi 4B (see below) 4 3.0 2109:3431 2019
Raspberry Pi 5 (see below) 4 3.0 1d6b:0002 2023
Renesas uPD720202 PCIe USB 3.0 host controller 2 3.0 2013
Rosewill RHUB-210 4 2.0 0409:005A 2011 2014
Rosonway RSH-518C (note) 7 3.0 2109:0817 2021
Rosonway RSH-A10 (see) 10 3.0 0bda:0411 2020
Rosonway RSH-A13 (warning) 13 3.1 2109:2822 2021
Rosonway RSH-A16 (note, warning) 16 3.0 0bda:0411 2020
Rosonway RSH-A104 (USB2 only) 4 3.1 2109:2822 2022
Rosonway RSH-A107 (aka ikuai A107-5) 7 3.1 0bda:5411 2022
Rosonway RSH-ST07C (only 4) 7 3.0 2109:2822 2023
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
StarTech DKT30CSDHPD3 USB-C Travel Dock 3 3.0 2109:2817 2018
StarTech HB30A4AIB (warning) 4 3.0 2109:2817 2018
Sunix SHB4200MA 4 2.0 0409:0058 2006 2009
System Talks Sugoi USB2-HUB4X 4 2.0 2007
Targus PA095UZ 2 2.0 2004
Targus PAUH212/PAUH212U 7 2.0 2004 2009
Texas Instruments TUSB4041PAPEVM 4 2.1 0451:8142 2015
UUGear MEGA4 (for Raspberry Pi 4B) 4 3.0 2109:0817 2021
VirtualHere USB3 4-port hub (note) 4 3.0 2024

This table is by no means complete. If your hub works with uhubctl, but is not listed above, please report it by opening new issue at https://github.com/mvp/uhubctl/issues, so we can add it to supported table. In your report, please provide exact product model and add output from uhubctl and please test VBUS off support as described below in FAQ.

Note that quite a few modern motherboards have built-in root hubs that do support this feature - you may not even need to buy any external hub.

USB 3.0 duality note

If you have USB 3.0 hub connected to USB3 upstream port, it will be detected as 2 independent virtual hubs: USB2 and USB3, and your USB devices will be connected to USB2 or USB3 virtual hub depending on their capabilities and connection speed. To control power for such hubs, it is necessary to turn off/on power on both USB2 and USB3 virtual hubs for power off/on changes to take effect. uhubctl will try to do this automatically (unless you disable this behavior with option -e).

Unfortunately, while most hubs will cut off data USB connection, some may still not cut off VBUS to port, which means connected phone may still continue to charge from port that is powered off by uhubctl.

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.

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. This may be fixed if libusb starts supporting different driver on Windows.

Note that it is highly recommended to have pkg-config installed (many platforms provide it by default).

First, you need to install library libusb-1.0 (version 1.0.12 or later, 1.0.16 or later is recommended):

  • Ubuntu: sudo apt-get install libusb-1.0-0-dev
  • Redhat: sudo yum install libusb1-devel
  • OpenSUSE: sudo zypper install libusb-1_0-devel
  • MacOS: brew install libusb, or sudo port install libusb-devel
  • FreeBSD: libusb is included by default
  • NetBSD: sudo pkgin install libusb1 gmake pkg-config
  • Windows: TBD?

To fetch uhubctl source and compile it:

git clone https://github.com/mvp/uhubctl
cd uhubctl
make

This should generate uhubctl binary. You can install it in your system as /usr/sbin/uhubctl using:

sudo make install

Note that on some OS (e.g. FreeBSD/NetBSD) you need to use gmake instead to build.

Also, on MacOS you can install uhubctl with all necessary dependencies in one shot using Homebrew tap:

brew tap mvp/uhubctl https://github.com/mvp/uhubctl
brew install uhubctl

To build/install from master branch, use --HEAD:

brew install uhubctl --HEAD

Usage

⚠️ On Linux, use sudo or configure USB permissions as described below!

To list all supported hubs:

uhubctl

You can control the power on a USB port(s) like this:

uhubctl -a off -p 2

This means operate on default smart hub and turn power off (-a off, or -a 0) on port 2 (-p 2). Supported actions are off/on/cycle/toggle (or 0/1/2/3). cycle means turn power off, wait some delay (configurable with -d) and turn it back on. Ports can be comma separated list, and may use - for ranges e.g. 2, or 2,4, or 2-5, or 1-2,5-8.

⚠️ Turning off built-in USB ports may cut off your keyboard or mouse, so be careful which ports you are turning off!

If you have more than one smart USB hub connected, you should choose specific hub to control using -l (location) parameter. To find hub locations, simply run uhubctl without any parameters. Hub locations look like b-x.y.z, where b is USB bus number, and x, y, z... are port numbers for all hubs in chain, starting from root hub for a given USB bus. This address is semi-stable - it will not change if you unplug/replug (or turn off/on) USB device into the same physical USB port (this method is also used in Linux kernel).

Linux USB permissions

On Linux, you should configure udev USB permissions (otherwise you will have to run it as root using sudo uhubctl).

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=="usb", MODE="0666", ATTR{idVendor}=="2001"
# Linux 6.0 or later (its ok to have this block present for older Linux kernels):
SUBSYSTEM=="usb", DRIVER=="usb", \
  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 (or remove idVendor filter):

SUBSYSTEM=="usb", DRIVER=="usb", MODE="0666", ATTR{idVendor}=="2109"
SUBSYSTEM=="usb", DRIVER=="usb", MODE="0666", ATTR{idVendor}=="1d6b"

If you don't like wide open mode 0666, you can restrict access by group like this:

SUBSYSTEM=="usb", DRIVER=="usb", MODE="0664", GROUP="dialout"
# Linux 6.0 or later (its ok to have this block present for older Linux kernels):
SUBSYSTEM=="usb", DRIVER=="usb", \
  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:

sudo usermod -a -G dialout $USER

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.

FAQ

What is USB per-port power switching?

According to USB 2.0 specification, USB hubs can advertise no power switching, ganged (all ports at once) power switching or per-port (individual) power switching. Note that by default uhubctl will only detect USB hubs which support per-port power switching (but you can force it to try operating on unsupported hubs with option -f). You can find what kind of power switching your hardware supports by using sudo lsusb -v:

No power switching:

wHubCharacteristic 0x000a
  No power switching (usb 1.0)
  Per-port overcurrent protection

Ganged power switching:

wHubCharacteristic 0x0008
  Ganged power switching
  Per-port overcurrent protection

Per-port power switching:

wHubCharacteristic 0x0009
  Per-port power switching
  Per-port overcurrent protection

How do I check if my USB hub is supported by uhubctl?

  1. Run sudo uhubctl. If your hub is not listed, it is not supported. Alternatively, you can run sudo lsusb -v and check for Per-port power switching - if you cannot see such line in lsusb output, hub is not supported.
  2. Check for VBUS (voltage) off support: plug a phone, USB light or USB fan into USB port of your hub. Try using uhubctl to turn power off on that port, and check that phone stops charging, USB light stops shining or USB fan stops spinning. If VBUS doesn't turn off, your hub manufacturer did not include circuitry to actually cut power off. Such hub would still work to cut off USB data connection, but it cannot turn off power, and we do not consider this supported device.
  3. If tests above were successful, please report your hub by opening new issue at https://github.com/mvp/uhubctl/issues, so we can add it to list of supported devices. Please do not report unsupported hubs, unless it is different hardware revision of some already listed supported model.

USB devices are not removed after port power down on Linux

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.

This is Linux kernel issue and is fixed since uhubctl 2.5.0 for systems with Linux kernel 6.0 or later.

If you are still using Linux 5.x or older, you can use this workaround for this issue:

sudo uhubctl -a off -l ${location} -p ${port}
sudo udevadm trigger --action=remove /sys/bus/usb/devices/${location}.${port}/

Device file will be removed by udev, but USB device will be still visible in lsusb. Note that path /sys/bus/usb/devices/${location}.${port} will only exist if device was detected on that port. When you turn power back on, device should re-enumerate properly (no need to call udevadm again).

Power comes back on after few seconds on Linux

Some device drivers in kernel are surprised by USB device being turned off and automatically try to power it back on.

This is Linux kernel issue and is fixed since uhubctl 2.5.0 for systems with Linux kernel 6.0 or later.

If you are still using Linux 5.x or older:

You can use option -r N, where N is some number from 10 to 1000 to fix this - uhubctl will try to turn power off many times in quick succession, and it should suppress that.

Disabling USB authorization for device in question before turning power off with uhubctl should help:

echo 0 > sudo tee /sys/bus/usb/devices/${location}.${port}/authorized

If your device is USB mass storage, invoking udisksctl before calling uhubctl should help too:

sudo udisksctl power-off --block-device /dev/disk/...`
sudo uhubctl -a off ...

Multiple 4-port hubs are detected, but I only have one 7-port hub connected

Many hub manufacturers build their USB hubs using basic 4 port USB chips. E.g. to make 7 port hub, they daisy-chain two 4 port hubs - 1 port is lost to daisy-chaining, so it makes it 4+4-1=7 port hub. Similarly, 10 port hub could be built as 3 4-port hubs daisy-chained together, which gives 4+4+4-2=10 usable ports.

Note that you should never try to change power state for ports used to daisy-chain internal hubs together. Doing so will confuse internal hub circuitry and will cause unpredictable behavior.

Raspberry Pi turns power off on all ports, not just the one I specified

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:

Raspberry Pi B+,2B,3B

  • Single hub 1-1, ports 2-5 ganged, all controlled by port 2:

    uhubctl -l 1-1 -p 2 -a 0

    Trying to control ports 3,4,5 will not do anything. Port 1 controls power for Ethernet+WiFi.

Raspberry Pi 3B+

  • Main hub 1-1, all 4 ports ganged, all controlled by port 2 (turns off secondary hub ports as well). Port 1 connects hub 1-1.1 below, ports 2 and 3 are wired outside, port 4 not wired.

    uhubctl -l 1-1 -p 2 -a 0

  • Secondary hub 1-1.1 (daisy-chained to main): 3 ports, port 1 is used for Ethernet+WiFi, and ports 2 and 3 are wired outside.

Raspberry Pi 4B

⚠️ If your VL805 firmware is older than 00137ad (check with sudo rpi-eeprom-update), you have to update firmware to make power switching work on RPi 4B.

  • USB2 hub 1, 1 port, only connects hub 1-1 below.

  • USB2 hub 1-1, 4 ports ganged, dual to USB3 hub 2 below:

    uhubctl -l 1-1 -a 0

  • USB3 hub 2, 4 ports ganged, dual to USB2 hub 1-1 above:

    uhubctl -l 2 -a 0

  • USB2 hub 3, 1 port, OTG controller. Power switching is not supported.

Raspberry Pi 5

Raspberry Pi 5 has two USB2 ports and two USB3 ports (total 4). These ports are connected to 4 distinct USB hubs 1,2,3,4 in really weird configuration (but depending on OS and HW revision hubs of interest can be 2,3,4,5). If USB3 device is connected to blue socket, it will be detected on USB3 hub 2 or 4. If USB2 device is connected to any socket or USB3 device connected to black socket, it will be detected on USB2 hub 1 or 3. Regardless of USB2/USB3 connection type, blue sockets are always port 1, and black sockets are always port 2.

Each of 4 USB onboard hubs advertises as supporting per-port power switching, but this is not true. In reality, Raspberry Pi 5 all 4 ports are ganged together in one group, despite belonging to 4 different logical USB hubs.

To turn off VBUS power it has to be disabled across all onboard hubs and ports with:

uhubctl -l 2 -a 0
uhubctl -l 4 -a 0

To turn it back on:

uhubctl -l 2 -a 1
uhubctl -l 4 -a 1

Note that VBUS power goes down only if all ports are off - enabling any single port enables VBUS back for all 4 ports.

Notable projects using uhubctl

Project Description
Morse code USB light Flash a message in Morse code with USB light
Webcam USB light Turn on/off LED when webcam is turned on/off
Cinema Lightbox Turn on/off Cinema Lightbox from iOS Home app
Build Status Light Create a build status light in under 10 minutes
Buildenlights GitLab/GitHub project build status as green/red light
Weather Station Reset Weather Station when it freezes
sysmoQMOD Reset cellular modems when necessary
Smog Sensor Raspberry Pi based smog sensor power reset
Terrible Cluster Power on/off Raspberry Pi cluster nodes as needed
Ideal Music Server Turn off unused USB ports to improve audio quality
USB drives with no phantom load Power USB drives only when needed to save power
USB drive data recovery Recover data from failing USB hard drive
Control power to 3D printer OctoPrint web plugin for USB power control
USB fan for Raspberry Pi Control USB fan to avoid Raspberry Pi overheating
Raspberry Pi Reboot Router Automatically reboot router if internet isn't working
Control USB Lamp With Voice Voice Control of USB Lamp using Siri and Raspberry Pi
Control USB LED Strip Controlling USB powered LED Light Strip
Brew beer with Raspberry Pi Automated beer brewing system using Raspberry Pi
Webcam On-Air Sign Automatically light up a sign when webcam is in use
Do it yourself PPPS Solder wires in your USB hub to support uhubctl
Open source PPPS hub Open source hardware project for uhubctl compatible hub
Python Wrapper for uhubctl Module to use uhubctl with Python
labgrid Framework for testing embedded Linux on hardware

Copyright

Copyright (C) 2009-2024 Vadim Mikhailov

This file can be distributed under the terms and conditions of the GNU General Public License version 2.