Comment 74 for bug 561734

If you are still seeing this can you please give the following information:

The graphics card you have from:

lspci|grep -i vga

Whether you have any proprietary graphics drivers installed; I think the following should say that:

jockey-text -l

The version of quadrapassel you have:
dpkg -l quadrapassel|cat

and finally what mesa stuff you have installed:
dpkg -l \*mesa\*|grep ^ii

and maybe the output of glxinfo

Dave