Public bug reported:
Binary package hint: gnome-power-manager
The Fn+Home and Fn+End used to control brightness do not work in gutsy.
What works:
- adjusting brightness with Fn+Home/Fn+End on the console
- adjusting brightness with Fn+Home/Fn+End while plain X is running from the
console
- adjusting brightness with Fn+Home/Fn+End while gnome session is running and
when gnome-power-manager is killed.
What does not work:
- adjusting brightness from the brightness applet
- adjusting brightness with Fn+Home/Fn+End while gnome session is running.
II have debugged hald and gnome power manager and here are my findings.
When Fn+Home/Fn+End is pressed, hald receives the GetBrightness message,
and calls /usr/lib/hal/scripts/hal-system-lcd-get-brightness. This
script correctly uses
/sys/class/backligh/thinkpad_panel/actual_brightness and reports correct
brightness level via exit value.
hald sends (probably a wrong) response to gnome-power-manager and gnome-
power-manager always reports
[gpm_brightness_lcd_get_hw] gpm-brightness-lcd.c:116 (15:17:07):
GetBrightness returned level: 0
as a result of this new wrong brightness value is computed and sent back
to hald via SetBrightness.
hald invokes /usr/lib/hal/scripts/hal-system-lcd-set-brightness with the
new brightness level (which is incorrectly computed) and sets it
correctly to hardware.
Removing /usr/lib/hal/scripts/hal-system-lcd-set-brightness makes the
stuff work again, although he brightness level indicator always shows
the level of 0.
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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brightness indicator does not work on thinkpad
https://bugs.launchpad.net/bugs/137972
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