On 01/11/2014 11:22 AM, Bradley Baetz wrote:
> Hi,
>
> I have a Dell Vostro 3560 laptop, with hybrid graphics (intel + radeon).
>
> This exposes 3 backlight devices - acpi_video0, acpi_video1, and
> intel_backlight. Only the intel_backlight/brightness file actually
> changes the backlight. Is this a kernel bug, or should userspace
> 'know' which backlight file to use based on which graphics device is
> active? XFCE picks the first one it finds (acpi_video0), which doesn't
> work.
Solving it from userspace:
You can specify which backlight interface to use by editing /etc/xorg.conf:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that works here
Driver "intel"
BusID "PCI:0:2:0"
EndSection
See https://wiki.archlinux.org/index.php/Backlight
solving it from kernel space:
Since the firmware claims support of win8, you can forget the
acpi_backlight=vendor cmdline option and just use video.use_native_backlight=1.
Hope it helps.
-Aaron
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