Ubuntu
acpid package

  1. Bug #285323
  2. Comment #57

Comment 57 for bug 285323

Revision history for this message
Kārlis M. (mikelsk) wrote : Re: Losing keyboard and mouse control when changing screen brightness with fn + arrow under intrepid

Same problem on Dell Inspiron 5100 and Ubuntu 8.10.
Turning screen brightness up or down with Fn+Up, Fn+Down results in keyboard not working.
While keyboard is not working:
 1) Mouse is still functional, no problem with pointer moving erratically;
 2) however most menus are not responsive (confirming Endolith's point 1.);
 3) process hald-addon-dell-backlight hogs CPU (confirming Endolith's point 3.);
 4) Fn+Up/Down still works to change screen bightness
Following action bring keyboard back to normal:
 1) Switching to VM (Ctrl+Alt+F1) and back (Ctrl+Alt+F7);
 2) Killing process pgnome-power-manager;
 3) Waiting about 10-15 min;

Other combinations of special keys, such as Fn+PageUp (sound volume up), Fn+PageDown (sound volume down), Fn+End (sound mute/unmute), Fn+Ins (Print Screen) are fully functional and do not cause any problem. However, these do not work while keyboard is blocked after using Fn+Up/Down keys.