https://bugzilla.kernel.org/show_bug.cgi?id=42861
Cheppes <chep...@mailinator.com> changed:
What |Removed |Added
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CC| |chep...@mailinator.com
--- Comment #2 from Cheppes <chep...@mailinator.com> 2012-08-28 17:29:35 ---
I have a similar problem, it seems to come from a bug in the /sys interface.
Here is what I have on boot:
# cd /sys/class/backlight
# grep -H '' */*(.)
acpi_video0/actual_brightness:7
acpi_video0/bl_power:0
acpi_video0/brightness:7
acpi_video0/max_brightness:7
acpi_video0/type:firmware
intel_backlight/actual_brightness:4648
intel_backlight/bl_power:0
intel_backlight/brightness:4648
intel_backlight/max_brightness:4648
intel_backlight/type:raw
And here is what happens when I change the value:
# echo 0 >acpi_video0/brightness
# grep -H '' */*(.)
acpi_video0/actual_brightness:7
acpi_video0/bl_power:0
acpi_video0/brightness:0
acpi_video0/max_brightness:7
acpi_video0/type:firmware
intel_backlight/actual_brightness:309
intel_backlight/bl_power:0
intel_backlight/brightness:4648
intel_backlight/max_brightness:4648
intel_backlight/type:raw
The ACPI backend doesn't return the updated value for actual_brightness. This
throws off the user space tools that rely on this interface, like the intel
xorg video driver.
PS: the "samsung" interface that appears when setting acpi_backlight=vendor is
even buggier.
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