Hi, Radeon VE is affected as well: 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon VE QY (prog-if 00 [VGA]) Subsystem: ATI Technologies Inc Radeon 7000/Radeon VE I checked with kernel 2.4.19 & 2.4.20, both the same black glxgears window. Furthermore I first downgred xserver-xfree86 - still the same. Downgrading xlibsmesa3 to 4.2.1-3 finally resolved the problem so it looks like the bug actually belongs to xlibmesa3-gl. Regards, -- Guido