Comment 7 for bug 539579

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Alexander Stedile (alexander-stedile) wrote :

My graphics adapter is an ATI Mobility Radeon X1400. Adding radeon.modeset=0 to the GRUB command line seemed to avoid this problem.
See also https://wiki.ubuntu.com/X/KernelModeSetting

I can't remember where, but I read that this option is a workaround needed until Kernel version 2.6.34.