I have the same issue. See #370382 and https://bugs.freedesktop.org/show_bug.cgi?id=7112
I discovered that the problem is in acceleration. Workaround is to disable acceleration :( Section "Device" Identifier "s3_trio64v2" Driver "s3" Option "noaccel" ^^^^^^ ^^^^^^^^^ Option "DPMS" EndSection -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]