fn+f1 to turn off monitor power on thinkpad

# ubuntu 10.04

It's based on acpid, acpi-support. while some hotkeys pressed, acpi events are triggered then some handlers be called according to the events respectively. 

/etc/acpi contains scripts for handler, /etc/acpi/events contains the events definition. Now it targets on turn off monitor power because it has to modify some codes in my laptop. Fn+F1 is the hotkey to turn off monitor power.

The screenblank.sh is the handler. It finally calls "xset dpms force off" to turn off monitor power, but before the command becomes effective, it detects some user information. It fails in 3 lines of the file: for x in /tmp/.X11-unix/* , displaynum = `echo $x | sed s#/tmp/.X11-unix/X##` and getXuser because there is no /tmp/.X11-unix folder in my laptop. Subsequently, getXuser is called from /usr/share/acpi-support/power-funcs and it finds the pattern of ":$displaynum". However, there is no colon in the results of command "finger" so it finds nothing.

In the workaround solution, $displaynum is forced to 0 and user=`finger| grep -m1 ":$displaynum " | awk '{print $1}'` is modified to user=`finger| grep -m1 tty | awk '{print $1}'` in the code of getXuser function copied from power-funcs and pasted in screenblank.sh. No code be removed and it can be reverted to the original codes.