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Old 12-22-2010, 07:30 PM   #1
Registered: Apr 2004
Location: Europe
Distribution: Debian, Slackware
Posts: 505

Rep: Reputation: 46
ACPI events in /etc/acpi/events

I've been trying to get Fn+F3 to toggle the backlight on my trusty old Thinkpad R50 running Linux Mint 9 (~ Ubuntu 10.04 with some added codeds and stuff). I tried to do this by adding an event handler (backlight) in /etc/acpi/events:

event=button[ /]screenlock
and a script ( for it in /etc/acpi:

if [ -e /tmp/screenoff ]; then
  sudo /usr/sbin/radeontool light on
  rm -f /tmp/screenoff
  sudo /usr/sbin/radeontool light off
  touch /tmp/screenoff
The result was that it doesn't work. However, if I run a second instance of acpid, the hotkey starts working. Then I took a look at this:

From which I found out that ACPI events are passed to HAL through a socket in /var/run (is that why the /etc/apci/events doesn't work anymore?). In the same document it says that:

hal-addon-acpi currently only handles a very limited set of ACPI events (button, ac_adapter, battery).
Bummer. So it can't be done with HAL and it doesn't work "the old fashioned way". How exactly does it work?

Last edited by alienDog; 12-22-2010 at 08:01 PM.


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