[SOLVED] Backlight keys not working

The backlight keys on my laptop aren't working in arch. xbacklight also does not work. Both of these things work in Ubuntu. Here is my GRUB_CMDLINE_LINUX_DEFAULT:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 acpi_backlight=vendor acpi_osi=Linux radeon.modeset=1"
When I installed Ubuntu, I had to add "acpi_backlight=vendor acpi_osi=Linux", although that doesn't seem to be helping here.
in /sys/class/backlight I see acpi_video0, acpi_video1, and intel_backlight. After echoing values into all of them, only intel_backlight seems to do anything. On Ubuntu, the only thing I see in that folder is intel_backlight.
Does anyone have any suggestions? The wiki doesn't have anything I haven't already tried.
Last edited by gsingh93 (2013-07-23 16:02:39)

I figured it out.
I confirmed from Xorg.0.log that acpi_video1 was being used instead of intel_backlight. However, I had already tried the fix here: http://bugs.debian.org/cgi-bin/bugrepor … =651741#73, which is also mentioned by WonderWoofy, but X server wouldn't start. I tried it again, but this time I took a look at the logs and I realized that the fix listed in the bug report has two Identifier lines, causing X server to not start. I removed the Card0 line and X started fine and I was able to control the backlight. I'll add this information to the bug report.
Thanks for the help.
Last edited by gsingh93 (2013-07-23 16:03:03)

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[SOLVED] Backlight keys not working

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