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I don't know how , but somehow automatic power-off of usb devices got accidently enabled. Now my usb mouse goes off even if it's idle for 2-3 seconds. it's really irritating.


P.S. This happened after i installed powertop and powernap. May be it has something to do with these two.

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askubuntu.com/questions/285434/… –  Qasim Jun 14 '13 at 14:53

3 Answers 3

up vote 6 down vote accepted

It's PowerNap that's doing this.

You can disable just this part of PowerNap's power savings scripts with:

sudo powernap-action --disable usb_autosuspend
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Just copy paste the following command in terminal and it will disable auto suspending.

Disabling auto suspending USB

    for i in /sys/bus/usb/devices/*/power/autosuspend;
    do echo 2 > $i;

Disable USB autosuspend

for foo in /sys/bus/usb/devices/*/power/level;
do echo on > $foo;
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Disable USB autosuspend is exactly what I was looking for. Here I don't have powernap installed. –  Fernando Kosh Jan 24 '14 at 1:08
Same, I don't have powernap either. This worked for me. –  eggonlegs Feb 25 '14 at 1:10
Is that reboot-persistent ? –  Kwaio Apr 25 '14 at 12:23
nope @Kwaio ... also have a look askubuntu.com/questions/285434/… –  Qasim Apr 25 '14 at 12:37
How to make it reboot-persistent: askubuntu.com/questions/73590/… –  Bryce Sep 18 '14 at 23:54

Could it be that laptop mode tools are causing this? If so, try the following:

  1. optional: Create a backup of /etc/laptop-mode/conf.d/usb-autosuspend.conf by copying it in your home folder:

    cp /etc/laptop-mode/conf.d/usb-autosuspend.conf ~/usb.autosuspend.old
  2. Get the USB ID of your mouse/keyboard


    This will return a list including ID xxxx:xxxx for your mouse/keyboard.

  3. Edit the original usb-autosuspend.conf

    sudo gedit /etc/laptop-mode/conf.d/usb-autosuspend.conf
  4. There will be an entry called AUTOSUSPEND_USBID_BLACKLIST='' change this to AUTOSUSPEND_USBID_BLACKLIST='xxxx:xxxx'

  5. This should stop your USB mouse/keyboard from being suspended. Now you either need to restart your computer or restart laptop-mode using

    sudo service laptop-mode restart

source: http://www.hecticgeek.com/2012/06/fix-usb-mouse-not-working-laptop-mode-tools-ubuntu/

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You find your ID with the command lsusb|grep -i mouse|sed 's/^.* ID //g'|sed 's/ .*$//g' (assuming there is the word "mouse" in the string for your mouse) If you don't find out the ID of your mouse, use watch -d lsusb while you plug in your mouse. –  rubo77 Oct 10 '14 at 22:26

protected by Community Oct 11 '14 at 2:53

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