Comment 33 for bug 1163720

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Addie MacGruer (addiemacgruer) wrote : Re: Brightness control broken on XPS13 with 3.8.0-16 and 3.8.0-22

Hi Daniel. Had to do a reinstall; hadn't left any space on the drive for an EFI partition.

I installed the Ubuntu 13.04 x64 release, which came with the 3.8.0-19 kernel. This had a strange result, which was that the screen was fixed to minimum (backlight off) brightness, and wouldn't change. Doing a software update to 3.8.0-27 fixed the issue, and resulted in the normal operation which I was expecting.

My previous installation, which booted in legacy bios, had also been updated to 3.8.0-27. Brightness wasn't operational on boot or after resume until a script like Frank's was run.