Carlo,
since 3.5.0-22.34, several MC related patches[0] have landed in the kernel for
quantal. Could you please try the latest version available from -updates and
see if this is still an issue? Thanks.
[0]
54fce73 drm/radeon: disable the crtcs in mc_stop (evergreen+) (v2)
0dfac2f drm/radeon: properly lock disp in mc_stop/resume for evergreen+
16bf4c2 drm/radeon/evergreen+: wait for the MC to settle after MC blackout
9d49c9d drm/radeon: fix MC blackout on evergreen+
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1112898
Title:
video error with ubuntu 12.10 and kernels after 3.50.21
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