The problem is the package s3savage-driver ii s3savage-drive 1.1.23t-1 S3 Savage drivers for XFree86 4.x
jb22:~# dpkg -L s3savage-driver /. /usr /usr/X11R6 /usr/X11R6/lib /usr/X11R6/lib/modules /usr/X11R6/lib/modules/drivers /usr/X11R6/lib/modules/drivers/savage_drv.o package diverts others to: /usr/share/s3savage-driver/diversions/savage_drv.o /usr/share /usr/share/doc /usr/share/doc/s3savage-driver /usr/share/doc/s3savage-driver/README.Debian /usr/share/doc/s3savage-driver/copyright /usr/share/doc/s3savage-driver/changelog.Debian.gz dpkg -L xserver-xfree86 tells the following: /usr/X11R6/lib/modules/drivers/savage_drv.o diverted by s3savage-driver to: /usr/share/s3savage-driver/diversions/savage_drv.o So the X Server tries to use the driver for the old X Server Version 4.2.x instead of it's own driver. I removed s3savage-driver and restored the driver savage_drv.o from xserver-xfree86 and now it works fine. --