https://bugzilla.kernel.org/show_bug.cgi?id=15764
Summary: Samsung P460 screen brightness control does not work
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32-19
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=25948)
--> (https://bugzilla.kernel.org/attachment.cgi?id=25948)
dmesg
System: Samsung P460 notebook, BIOS-version 07LQ (current version)
Core 2 Duo P7350 2x 2.00GHz, Intel GMA X4500HD IGP
$ cat /proc/acpi/video/GFX0/DD04/brightness
levels: 25 35 45 60 70 80 90 100
current: 100
$ echo -n 25 > /proc/acpi/video/GFX0/DD04/brightness
has no effect on the brightness
It seems to me that this is caused by the system BIOS:
$ dmesg | grep brightness
[ 0.208482] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC
function
I also tried booting with acpi_osi=Linux but with no changes.
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