[Bug 1174495] [NEW] kwin instability with r600 radeon and high monitor resolutions

[sfar]

Public bug reported:

I think the version of kwin included in 13.04 contains a known bug as described here:
https://bugs.kde.org/show_bug.cgi?id=315089
https://bugs.freedesktop.org/show_bug.cgi?id=61182

My understanding of the problem is as follows:
* The Mesa radeon r600 driver recently added support for MSAA GLX visuals
* Kwin isn't aware of MSAA properties and happens to (incorrectly) pick MSAA visuals for everything
* These visuals occupy a large amount of memory when running at high monitor resolutions
*  Mesa is "only" capable of mapping 256MB of visuals into CPU address space at once
* Kwin's oversize visuals exceeds this limit, resulting in constant crashes

The two radeon systems I have both crash immediately after logging in,
when running with at a resolution of 2560x1440 and desktop effects
enabled. After restarting kwin, a crash can be induced by performing
actions that triggers desktop effects/animations. The resulting
callstack is as given in the linked KDE bug.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: kde-window-manager 4:4.10.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Mon Apr 29 19:53:57 2013
InstallationDate: Installed on 2013-04-27 (2 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: kde-workspace
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1174495

Title:
  kwin instability with r600 radeon and high monitor resolutions

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