Bug#682099: xserver-xorg-video-ati: EXAPixmaps=On screen tearing at high resolution under certain configurations

[Nix]

On 24 Oct 2012, Benjamyn Ward verbalised:

> There's an ext4 bug floating around. Just watch which kernel you
> install if you're using the ext4 file system.
>
> https://lkml.org/lkml/2012/10/23/779

This is less problematic than we thought at first. It appears to cause
fs damage only if you reboot *while unmounting* a dirty fs. Simple
reboots of dirty fses do not cause corruption.

(Also, this happens with 3.6.1 as well, though it is harder to trigger.
It may happen with much older kernels. I still have to test that, and
since this is not my day job...)

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