OK then. I would blame bypass but based on comment #5 you're effectively
saying bypass is not the problem (because it still happens with bypass
disabled).

Other changes that landed between those two package versions (r1028..1033) are 
relatively insignificant. So the possibilities are:
1. One of those insignificant changes has caused the problem; or
2. You made a mistake when trying the workaround from bug 1218735; or
3. You downgraded some other package which has fixed the problem.

I think #3 is now most likely, so... Using the "working" packages,
please run "ps auxw | grep mir" and verify for us that Mir is in fact
running. Also try "ps auxw | grep unity-system-compositor".

Please also try generating a full package list for both the working and 
non-working states, with:
    dpkg -l > working.txt
and then break it again before doing:
    dpkg -l > nonworking.txt
and attach those.

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1218815

Title:
  [radeon] Graphic glitches and screen corruption (vertical lines) on
  XMir surfaces only

To manage notifications about this bug go to:
https://bugs.launchpad.net/xmir/+bug/1218815/+subscriptions

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