Comment 34 for bug 62135

I'm not using Beryl, but the compositor of the xfce4 window manager, so I cannot help you there. I've uploaded the package that I've been using successfully since Oct 24, though. You might try that and see if it helps. If not, I suppose there's something wrong with Beryl.
<http://home.teleos-web.de/obrackmann/libgl1-mesa-dri_6.5.1~20060817-0ubuntu3+local1_i386.deb>