http://bugzilla.kernel.org/show_bug.cgi?id=14313
Summary: Backlight brightness control needs screen turning off
and on again to take effect
Product: ACPI
Version: 2.5
Kernel Version: 2.6.31-gentoo
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
I have an Acer 6935G.
When I change the brightness with the function keys, it does register in both
/sys/devices/platform/acer-wmi/backlight/acer-wmi/{actual_brightness,brightness},
but it doesn't have any effect on the screen's actual brightness until the
screen is turned off and on again with FN+F6.
I believe this might be a regression, since I think I can remember it used to
work at some point. But I have tried lots of different kernel versions and I
can't find one where it worked, so maybe I imagined this.
If I echo 9 > brightness, the screen brightness does not change even if I
toggle the screen's brightness.
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