Hi I tested squeeze amd64 with an ATI HD3400 (R600) graphic card. 1/ It works with non-free firmware and driver (fglrx). glxinfo ok glxgears thousands fps extremetuxracer more than 100 fps 2/ i tried with radeonhd driver and miserably failed: glxinfo -> segfault anything with GL -> segfault i tested lincity-ng : * SDL only works * GL -> segfault i followed http://wiki.debian.org/AtiHowTo and now don't know what to do :-( any advice/url/... is welcome Alain.