Finally I`m able to use linux-rt with the desired resolution again. The solution was to first remove any fglrx-driver. Then I fully deinstalled the linux kernels and xserver-xorg and then reinstalled those. Why didn`t I try that before?? Conlusion: I`ll never touch that fglrx driver again!! I guess either of the installation or deinstallation of the fglrx driver didn`t work properly and damaged some file or another. At least now I know that the fglrx driver definitetly doesn`t work with linux-rt. Anyway, thanks to everyone for your help!! Cheers Matthias _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user