USB auto-suspend

[chrispop99]

Some users on Facebook found they were unable to charge their Android phones. Charging would start, but stop after a few seconds. I was able to replicate the problem with two different Android phones, yet could charge other USB devices.
The problem is related to the auto-suspend feature active in the kernels we use. There is a Wiki article describing how to disable auto-suspend on a device-by-device basis, intended for users of certain scanners, that I would imagine would work for other devices. However for a desktop machine, or a laptop where convenience is more important than battery life, it is possible to disable auto-suspend for all devices by entering the following in a root terminal:

Code: Select all

USB_AUTOSUSPEND=0

Chris

[Jerry3904]

Thanks--I wondered what was going on there. Good work tracking it down!

It would be best if the user never ran into the problem at all...

[fehlix]

Code: Select all

USB_AUTOSUSPEND=0

There are seem to be some other additional nice parameters related to USB and power auto-suspend
within tlp's default's conf file /etc/default/tlp :

Code: Select all

$ grep -i USB /etc/default/tlp 
# Set to 0 to disable, 1 to enable USB autosuspend feature.
USB_AUTOSUSPEND=1
# Exclude listed devices from USB autosuspend (separate with spaces).
# Use lsusb to get the ids.
# Note: input devices (usbhid) are excluded automatically
#USB_BLACKLIST="1111:2222 3333:4444"
# Bluetooth devices are excluded from USB autosuspend:
USB_BLACKLIST_BTUSB=1
# Phone devices are excluded from USB autosuspend:
USB_BLACKLIST_PHONE=0
# Printers are excluded from USB autosuspend:
USB_BLACKLIST_PRINTER=1
# WWAN devices are excluded from USB autosuspend:
USB_BLACKLIST_WWAN=1
# Include listed devices into USB autosuspend even if already excluded
# Use lsusb to get the ids.
#USB_WHITELIST="1111:2222 3333:4444"
# (workaround for USB devices that cause shutdown problems).
#USB_AUTOSUSPEND_DISABLE_ON_SHUTDOWN=1

[Richard]

Really nice to know about this.
I like having it enabled so it turns off idle, external USB drives when
connected to the laptop, but have noticed phone and/or WhatsApp
get disconnected when idle.