** Changed in: gnome-power
Status: New => Expired
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https://bugs.launchpad.net/bugs/304940
Title:
[Regression intrepid] Screen brightness problems on Acer laptop
Status in Gnome Powermanager:
Expired
Status in “gnome-power-manager” package in Ubuntu:
Triaged
Status in “gnome-power-manager” package in Fedora:
Fix Released
Bug description:
Description of problem:
I have an Acer TravelMate 3260 laptop. The ACPI stuff like bluetooth, screen
brightness etc. is handled by acer-wmi module. In Ubuntu 8.04, brightness
control worked perfectly. On trying the Intrepid LiveCD, I am having the
problems with both control of brightness in preferences, and the on-screen
display which appears when I change brightness using the Fn+Arrow keys. The
problem is described in detail below. The problem is related to
gnome-power-manager per se.
This bug is reproducible on Fedora 10 as well.
How reproducible:
Always
Steps to Reproduce:
1. In g-p-m Preferences, "On AC Power", Set display brightness to XX% doesn't
work
2. Control brightness using Fn+Left/Right arrow keys, OSD shoots beyond max
and min limits
Actual results:
1. The brightness does not reduce/increase
2. The OSD fill increases even after full brightness, and decreases even
after zero
Expected results:
1. Change should take place instantly
2. OSD fill limits should be between actual limits of brightness only
Additional info:
I am pasting this info from fedora, but the same is also applicable from
Intrepid LiveCD.
I can control brightness software-"manually" from the console, by manually
writing and reading entries from
/sys/devices/platform/acer-wmi/backlight/acer-wmi. Here is sample output:
[rohan@fedora acer-wmi]$ pwd
/sys/devices/platform/acer-wmi/backlight/acer-wmi
[rohan@fedora acer-wmi]$ cat max_brightness
15
[rohan@fedora acer-wmi]$ cat actual_brightness
10
[rohan@fedora acer-wmi]$ echo 5 | sudo tee brightness
5
[rohan@fedora acer-wmi]$ cat brightness
5
[rohan@fedora acer-wmi]$ cat actual_brightness
5
[rohan@fedora acer-wmi]$
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