It's a very old question, related with laptop-mode, but I'll post my solution:
In Ubuntu 14.04 I edited
/etc/laptop-mode/conf.d/usb-autosuspend.conf and change this lines to blacklist
# The list of USB driver types that should not use autosuspend. The driver
# type is given by "DRIVER=..." in a USB device's uevent file.
# Example: AUTOSUSPEND_USBID_BLACKLIST="usbhid usb-storage"
## Old value: AUTOSUSPEND_USBTYPE_BLACKLIST=""
In Ubuntu 12.04 I must to edit
/etc/laptop-mode/conf.d/runtime-pm.conf and change this lines to blacklist
# The list of device driver types that should use autosuspend. The driver
# type is given by "DRIVER=..." in a device's uevent file.
# Example: AUTOSUSPEND_DEVTYPE_WHITELIST="usbhid usb-storage"
## Old value: AUTOSUSPEND_RUNTIME_DEVTYPE_WHITELIST=""
You can also blacklist
usb-storage! and you can also blacklist device by ID (
AUTOSUSPEND_RUNTIME_DEVID_WHITELIST in Ubuntu 12.04 or
AUTOSUSPEND_USBID_BLACKLIST in Ubuntu 14.04).
Then you'll need to restart laptop mode for the changes to take effect:
sudo /etc/init.d/laptop-mode restart
And then replug mouse. The mouse will not suspend again.
This works for me at work (ubuntu 12.04) and home (ubuntu 14.04).
Hope It helps :)