I have this problem too. I can not change brightness level with Fn keys untill I add acpi_backlight=vendor as a kernel parametar. Then everything works fine.
version info:
kernel: 2.6.31-rc3 mesa: 7.5rc4 xf86-video-intel 2.7.99.902 xorg-server: 1.6.2 Dell Vostro 1310
I have this problem too. I can not change brightness level with Fn keys untill I add acpi_backlight= vendor as a kernel parametar. Then everything works fine.
version info:
kernel: 2.6.31-rc3
mesa: 7.5rc4
xf86-video-intel 2.7.99.902
xorg-server: 1.6.2
Dell Vostro 1310