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Description of problem: With the Mesa installed by default in Fedora 15 (05/09/2011 snapshot) I have no blur in KWin. This was fixed on 5/10/2011. The link is here. https://bugs.freedesktop.org/show_bug.cgi?id=37042 The solution is to push a Mesa package rebased on a snapshot taken later than 05/10/2011.
mesa-7.11-0.11.20110525.0.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/mesa-7.11-0.11.20110525.0.fc15
Package mesa-7.11-0.11.20110525.0.fc15: * should fix your issue, * was pushed to the Fedora 15 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing mesa-7.11-0.11.20110525.0.fc15' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/mesa-7.11-0.11.20110525.0.fc15 then log in and leave karma (feedback).
Same with the Intel G33. Update mesa to mesa-7.11-0.11.20110525.0.fc15 don't resolve this problem.
@Stas If you read the upstream Bugzilla, this bug is indeed a typo that snuck into Mesa 2011-09-05 snapshot, and was fixed upstream the following day. Due to a strain of bad luck, Fedora got the buggy snapshot, and this bug report was filed as a "low hanging fruit" (easily solvable bug). Your problem certainly seems to be more serious than mine, and different. Please, file a bug against Mesa's Bugzilla, and when they got a fix, file another against Fedora Bugzilla, requesting the inclusion of the fixed package. mesa-7.11.0.11.20110525.0.fc15 fixes my issue.
mesa-7.11-0.11.20110525.0.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.