** 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. + 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)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1174495 Title: kwin instability with r600 radeon and high monitor resolutions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1174495/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
