Uli Armbruster, Fri 2011-11-11 @ 17:14:16+0100: > Ok here on my laptop it's definitely hardware-based, the backlight > doesn't work in the first moment, when the laptop is cold. I just > booted my cold laptop into 3.0.7 linux-rt and it happened there as > well. It seems that we have symptomatically similar but unrelated problems, then. I've only ever seen this problem with 3.1, and never with any earlier kernel.