[Solved] Backlight stopped working after upgrade

Hi,
I've been using Arch for a couple months now, and I had set up the backlight by adding the acpi_backlight=vendor kernel paramter.
I recently upgraded my system, and everything seems to be working, but now the backlight is set to some default value and doesn't change. My /etc/default/grub still has the kernel parameter in it.
$ xbacklight
100.000000
$ xbacklight -set 50
$ xbacklight
100.000000
Here is the kernel I've upgraded to:
$ uname -a
Linux choochootrain 3.8.5-1-ARCH #1 SMP PREEMPT Fri Mar 29 19:18:14 CET 2013 x86_64 GNU/Linux
I don't know much about mkinitcpio.conf, but upgrading the kernel didn't change any of the modules being loaded..
Does anyone have any idea what else could be causing this? Let me know what other information would be useful here!
Last edited by choochootrain (2013-05-22 00:07:13)

I upgraded from 3.6.9.1 -> 3.8.5.1, and I have an integrated Intel video card
$ lspci -v | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
I tried removing the acpi_backlight parameter, but no luck.
My laptop is a Toshiba Portege z930, so there are vendor specific entries in /sys
$ ls /sys/class/backlight
acpi_video0 intel_backlight toshiba
which I assume is why the original acpi_backlight=vendor worked.
Do you think this could be a kernel specific issue? I may end up downgrading until I can resolve this, as the backlight is blindingly bright right now

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