Comment 12 for bug 304940

Description of problem:
I just installed F10 on my Acer TravelMate 3260 laptop. The ACPI stuff like bluetooth, screen brightness etc. is handled by acer-wmi module. In Fedora 9, brightness control worked perfectly. In Fedora 10, 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.

Version-Release number of selected component (if applicable):
gnome-power-manager-2.24.1-3.fc10.i386

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 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]$