Red Hat Bugzilla – Bug 434964
screen brightness will not stay dim
Last modified: 2013-03-05 22:54:44 EST
Description of problem: If I set screen brightness to less than 100% in power
manager settings or using keyboard the brightness always gradually increases to 100%
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Set brighness to 0% on battery in power manager settings
2. unplug ac
Screen dims when ac is unplugged, then gradually reverts to 100% over about a minute
Screen should dim and stay dim
Same behavior if I set brightness on ac to 0% and plug in cable. If brightness
on ac and battery are both 0% then either action (plugging in or out) dims the
screen, but screen gradually reverts to full brightness over next minute.
If I reset brightness with the keyboard keys, screen still gradually brightens
again. (If I then touch a screen brightness key it reverts directly to dim,
rather than stepping gradually).
The only way I can have a dim screen is to kill gome-power-manager.
I have seen the same bug reported on ubuntu forums.
This has been a consistent problem since upgrading to FC8 over 3 months ago, but
the following steps just fixed it for me (Dell D410):
1. In a terminal (as me, not root):
> killall gnome-power-manager
3. log in again
Without the second half of step 1 the problem was always back after killing X,
logging out or rebooting, so restarting gnome-power-manager within the existing
gnome session appears to be what fixed it.
I can't debug this further since the above fix has survived logging out and in
After a suspend/Resume the problem was back again.
Killing gnome-power-manager did not help -- screen gradually brightened to full
even with gnome-power-manager not running! I've never seen this before. Repeated
kill and restart of gnome-power-manager did not help.
But this time just restarting X fixed it (it never has before).
I don't see any pattern here. For three months one behavior and now something
Same here, on a Lenovo X60s. As long as g-p-m is running, the screen brightness
constantly brighter, in, at least for me, totally random time intervals.
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