Bug#551387: stable vs testing xorg

["M" <martin@luminoussheep.net>]

In addition to the kernel errors in 2:2.11.0-1 I find some errors in xorg
log:

(WW) intel(0): i830_uxa_pixmap_swap_bo_with_image: bo map failed
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(EE) intel(0): Failed to submit batch buffer, expect rendering corruption
or even a frozen display: Input/output error.
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error
(WW) intel(0): i830_uxa_prepare_access: gtt bo map failed: Input/output error