Bug#618942: Similar issue with 2:1.7.7-13
Having a similar issue on wheezy with 2:1.7.7-13. Downgrading
xserver-xorg-core, xserver-common and xserver-xephyr to 2:1.7.7-11
solved the issue here. Running AMD64 with a Radeon HD 5600.
/ndlarsen
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