After the upgrade to 13.10 Saucy Salamander, the brightness controls stopped working. This worked fine from 12.04 throughout.

Does anyone have an idea how I can fix this? If not, can you point me at the right package to file a bug against?

Bug I filed so far:

https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1241745

Solutions I have tried:

/etc/default/grub

Changed this line to several options:

GRUB_CMDLINE_LINUX="" →

1. GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"


2. GRUB_CMDLINE_LINUX="acpi_backlight=vendor"


3. GRUB_CMDLINE_LINUX=”acpi_osi="!Windows 2012"

sudo update-grub

None worked.

I also tried to use xbacklight, which didn't work either. xbacklight -get wouldn't return anything.