Also, it would be useful if you could retest with ppa:xorg-edgers if you can reproduce the bug. I've been working on adding more assertions to the DRI handling which flagged a few potential issues - though I can't tell if the bug you've encountered is one of those.
Also, it would be useful if you could retest with ppa:xorg-edgers if you can reproduce the bug. I've been working on adding more assertions to the DRI handling which flagged a few potential issues - though I can't tell if the bug you've encountered is one of those.