Public bug reported:
Binary package hint: gnome-power-manager
GPM apparently does not know how to dim the backlight of my Samsung Q45
laptop.
[gpm_backlight_brightness_evaluate_and_set] gpm-backlight.c:365 (20:25:20):
no dimming hardware
[gpm_backlight_sync_policy] gpm-backlight.c:161 (20:25:20): choosing
sensible default
[gpm_backlight_sync_policy] gpm-backlight.c:163 (20:25:20): laptop, so use
GPM_DPMS_METHOD_OFF
[gpm_backlight_sync_policy] gpm-backlight.c:195 (20:25:20): BACKLIGHT
parameters 0 0 1800, method '4'
This leads to the problems that when going to battery the screen is not dimmed
and when the idle timeout kicks in the screen is blanked, but the backlight
stays on!
The xbacklight tool works just fine with this laptop.
I'll attach dmesg and debug output from GPM.
** Affects: gnome-power
Importance: Unknown
Status: Unknown
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: q45
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gpm does not dim backlight on Q45
https://bugs.launchpad.net/bugs/221478
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