https://bugzilla.kernel.org/show_bug.cgi?id=43307
Summary: Brightness control does not work on HP Pavilion
dv6-6b45eo laptop
Product: ACPI
Version: 2.5
Kernel Version: 3.4.0
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=73432)
--> (https://bugzilla.kernel.org/attachment.cgi?id=73432)
dmesg with acpi.debug_level=39 acpi.debug_layer=0x10000000
Setting display brightness level, either via the hotkeys or via
/sys/class/backlight/acpi_video1/brightness, has no effect.
Booting with acpi_backlight=vendor does not make the hotkeys work (but removes
the device from /sys/class/backlight).
Changing the brightness via /sys/class/backlight/acpi_video1/brightness has
only the result that the new value can after that be read from brightness or
actual_brightness.
Booting with acpi.debug_level=39 acpi.debug_layer=0x10000000 reports finding 11
backlight levels:
[ 45.528981] video-0732 [00] video_init_brightness : found 11 brightness
levels
OTOH dmesg contains this message (this may be related to the fact that this
laptop has dual Intel/Radeon GPUs):
[ 45.529448] video: probe of LNXVIDEO:00 failed with error -5
See attachments:
1) dmesg with acpi.debug_level=39 acpi.debug_layer=0x10000000
2) lspci -vvv output
3) acpidump output
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