Ubuntu
mesa package

  1. Bug #1061073
  2. Comment #69

Comment 69 for bug 1061073

Revision history for this message
Adam Lyall (magicmyth) wrote :

I was running 12.04 with the KDE 4.92 backports just fine. I decided to test out the latest Mesa using oibaf graphic drivers PPA which usually contains Mesa from master (9.1). After installing this I got the issue in this bug report. However, at the time I chalked it up to issues in the latest commits to master. I purged those drivers which made KWin work great again (Mesa 8.0.4) and decided to upgrade to 12.10 which brought with it Mesa 9.0 stable and the exact same issues I had with Mesa master.

Looking over the bug report it seems part of the issue stems from MSAA being used with KWin due to a mistake by an algorithm which the GLES version of Kwin does not do. I decided to test this and installed kde-window-manager-gles. Ran "kwin_gles --replace" and performance was massively improved. However I still have the screen corruptions plus the other re-draw errors mentioned about KWIN GLES.

Note I can still get some corruptions even with composite suspended as shown in the attached screen of krunner.

This is on a Lenovo x230t with a Intel HD4000 gpu from the i7-3520M