Public bug reported:

Upgrading to kernel 3.5.0-22 from 3.5.0-21 has broken my multiple
monitor setup using the open-source radeon driver. My DVI monitor
suffers from display corruption when booting, and can only run in mirror
mode with my second VGA monitor. Plugging in only one monitor fixes the
problem, but only allows the one display to be used.

Booting into kernel 3.5.0-21 fixes all issues and everything operates
normally.

I believe this is related to kernel changes in the DRM/radeon drivers
made upstream and first spotted in xorg-edgers a while back in #1093753,
although the proposed commit patch there did not resolve all issues.

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1105510

Title:
  [radeon] regression from 3.5.0-22 from 3.5.0-21 for multi-monitor
  setups

Status in “xorg-server” package in Ubuntu:
  New

Bug description:
  Upgrading to kernel 3.5.0-22 from 3.5.0-21 has broken my multiple
  monitor setup using the open-source radeon driver. My DVI monitor
  suffers from display corruption when booting, and can only run in
  mirror mode with my second VGA monitor. Plugging in only one monitor
  fixes the problem, but only allows the one display to be used.

  Booting into kernel 3.5.0-21 fixes all issues and everything operates
  normally.

  I believe this is related to kernel changes in the DRM/radeon drivers
  made upstream and first spotted in xorg-edgers a while back in
  #1093753, although the proposed commit patch there did not resolve all
  issues.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1105510/+subscriptions

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