https://bugzilla.kernel.org/show_bug.cgi?id=41112
Summary: HP EliteBook 8460p - Screen brightness not working
Product: ACPI
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Setting brightness level on HP EliteBook 8460p is not working. I tried these
commans:
# cat /sys/class/backlight/acpi_video0/max_brightness
20
# cat /sys/class/backlight/acpi_video0/brightness
20
# echo 0 > /sys/class/backlight/acpi_video0/brightness
# cat /sys/class/backlight/acpi_video0/brightness
0
# echo 20 > /sys/class/backlight/acpi_video0/brightness
# cat /sys/class/backlight/acpi_video0/brightness
20
It did not show me any error, but screen brightness was not changed. And
setting brightness with Fn keys does not working (xev see scancodes, but
nothing happened).
When I disabled ACPI (with acpi=off in grub) brightness keys started working,
but xev does not see scancodes. And all other Fn keys does not working (when
acpi is disabled).
And it is possible to change brightness (with Fn keys) in Grub. But when linux
kernel is loaded (with enabled acpi) brightness keys stop working.
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