** Changed in: cogl (Ubuntu Raring)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1174495
Title:
Window Managers instability with r600 radeon and high monitor
resolutions
Status in Compiz:
In Progress
Status in Compiz 0.9.9 series:
In Progress
Status in Mesa:
Unknown
Status in “cogl” package in Ubuntu:
New
Status in “compiz” package in Ubuntu:
In Progress
Status in “kde-workspace” package in Ubuntu:
Fix Committed
Status in “mesa” package in Ubuntu:
Confirmed
Status in “cogl” source package in Raring:
Confirmed
Status in “compiz” source package in Raring:
In Progress
Status in “kde-workspace” source package in Raring:
Fix Committed
Status in “cogl” source package in Saucy:
New
Status in “compiz” source package in Saucy:
In Progress
Status in “kde-workspace” source package in Saucy:
Fix Committed
Bug description:
[Impact]
KWin 4.10.2 is using MSAA visuals with 13.04's mesa. This is unintended and
leads to resource exhaustion which eventually crashes kwin.
This affects all users on the r600 with sufficiently sized displays.
[Test Case]
Run Kwin on the r600, if it does not crash after a while we are happy.
[Regression Potential]
None, the fix was done by an upstream KWin and Mesa developer plus it has
been incorporated into Fedora for a while plus it was used elsewhere in KWin
already but not in this specific code path.
[Other Info]
None.
--------------------------------------
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 attached.
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)
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