Hi, First sorry for the lateness of my answer, and thanks Jocelyn, your solution worked. Unfortunately, I can't tell if the version 1:0.2.904+svn842-2 of the openchrome package works because I switched to sid. However, I can tell the sid version (1:0.2.904+svn920-1) is working correctly without needing the 'Option "ActiveDevice" "CRT" trick'. Every problems I got are now fixed.