** Description changed: [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. + KWin 4.10.2 and Compiz 0.9.9 are using MSAA visuals with 13.04's mesa. + This is unintended and leads to resource exhaustion which eventually crashes the WM. 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. + Run Kwin or Unity with an r600 card, if it does not crash after a while we are happy. - [Regression Potential] + [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 + ProblemType: BugDistroRelease: 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 + MarkForUpload: TrueSourcePackage: kde-workspace UpgradeStatus: No upgrade log present (probably fresh install) + + -------------------------------------- + + Compiz (unity) is affected by the same issue as shown in this + stacktrace: + + http://paste.ubuntu.com/5661055/
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1174495 Title: Window Managers instability with r600 radeon and high monitor resolutions To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/1174495/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
