Brightness only works using manual controls

Bug #214440 reported by Joss Winn on 2008-04-09
Affects Status Importance Assigned to Milestone
gnome-power-manager (Ubuntu)

Bug Description

Binary package hint: gnome-power-manager

I can control display brightness using the keyboard but the settings in Power Manager preferences, seem to be ignored. For example, when I unplug the AC power, the screen dims, but when I plug it back in again, the screen notifier shows the brightness increasing to about 90% (it is set to be 100% on AC power) but in fact the screen remains dimmed and does not actually increase. If I unplug the AC power again, the display brightness decreases and so on until after unplugging the AC power four times, the display brightness is at its lowest level and plugging in AC power makes no difference to the actual brightness. I can rectify this by using the FN-F11 keys.

I'm running the latest Hardy updates on a Lenovo 3000 N100. I've attached some logs. This is not a recent problem but started occurring a few weeks ago.

Thank you.

Joss Winn (josswinn) wrote :
Joss Winn (josswinn) wrote :


This bug is still around. When I boot up, display brightness is always low and requires manual increasing. Unplugging AC power and then plugging AC power still does not return display brightness back to 100%.


Joss Winn (josswinn) wrote :

This appears to be related to the X intel video module. I've noticed that on boot, the screen dims as the drivers are being loaded, before any Gnome related stuff is introduced.

unggnu (unggnu) wrote :

Closing then for gnome-power-manager. The driver issue is Bug #241867.

Changed in gnome-power-manager:
status: New → Invalid
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