USB wake from suspend udev incantation

[Paul Ausbeck <paula@soe.ucsc.edu>]

I've got a desktop system with no ps/2 ports. I wanted to wake the 
machine from S3 suspend using either the USB keyboard or mouse. After 
researching this topic a bit online, I was unable to find a reasonably 
simple solution. Following some study, I devised the following udev rule 
for enabling the wakeup capability of any attached USB HID device. Or at 
least any directly attached USB HID device. It turns out that the 
"enabled" string has to be present in the power/wakeup file associated 
with the actual device(s) and in the analogous file associated with the 
host controller. Adding intervening hubs would presumably complicate 
matters. The rule is pasted below and in the attached file.

Enjoy.

------------------------------------ 
/etc/udev/rules.d/90-persistent-usb.rules------------------------------------------------------------------

ACTION=="add", SUBSYSTEM=="usb", DRIVER=="usbhid", RUN+="/bin/sh -c 
'echo enabled > /sys$env{DEVPATH}/../../power/wakeup'", RUN+="/bin/sh -c 
'echo enabled > /sys$env{DEVPATH}/../power/wakeup'"
ACTION=="add", SUBSYSTEM=="usb", DRIVER=="usbhid", RUN+="/bin/sh -c 'echo enabled > /sys$env{DEVPATH}/../../power/wakeup'", RUN+="/bin/sh -c 'echo enabled > /sys$env{DEVPATH}/../power/wakeup'"