Public bug reported:
Binary package hint: gnome-power-manager
I just installed 8.10 Beta. It was no upgrade it was a new installation.
First everything seemed to be fine, but sometimes the backlight of my notebook
(Samsung X20 with intel graphics - chipset) gets darker and darker and after a
while it returns to more brightness.
I still can adjust the brightness using Fn+up and Fn+down, but the whole
intervall I can adjust is darkening and getting more bright. When the
cycle is at its darkest point I can reduce the brightness with Fn+down
to a nearly complete black. At that point the max. Fn+up setting seems
to be darker than the max Fn+down at the brightest point in the cycle.
But - to make it more complicated - it isn't always a real cycle.
Sometimes it only gets darker, perhaps after a time a little bit
brighter and then darker again. Sometimes there are no regular schemes
detectable.
I tried to look in /sys/class/backlight, but that folder contains nothing.
I also took a look at /proc:
[EMAIL PROTECTED] pwd
/proc/acpi/video/GFX0/DD03
[EMAIL PROTECTED] cat info
device_id: 0x0410
type: LCD
known by bios: yes
[EMAIL PROTECTED] cat brightness
<not supported>
At other models there was always a /proc/acpi/video/LCD folder where
brightness could be set using the echo command. I'm not sure if
everythings ok here, because I never looked at the /proc/acpi/video
folder as the brightness adjustments always worked with the Fn-Keys.
Finally:
My main-suspect in that case is the gnome-power-manager, as the cycles stop,
when I kill the gnome-power-manager process. Mostly the cycles reappear when I
restart the gnome-power-manager through typing "gnome-power-manager" in a
terminal. At the moment I'm lucky, g-p-m is running and the brightness remains
constant.
Conclusion:
Something is wrong. Terrible wrong. When you can't see what you are doing all
other bugs are unimportant. :-)
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: brightness g-p-m gnome-power-manager intel-graphics
--
backlight brightness oscillates
https://bugs.launchpad.net/bugs/284550
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