Failed to load module "sis671" after upgrade to 10.10

After upgrade to 10.10 (Maverick) I do not get a GUI (is this a bug?). After reboot a black screen was shown with the possibility to login. That works.

Part of /var/log/xorg.0.log:
[ 13.092] (II) LoadModule: "sis671"
[ 13.093] (II) Loading /usr/lib/xorg/modules/drivers/sis671_drv.so
[ 13.093] dlopen: /usr/lib/xorg/modules/drivers/sis671_drv.so:
undefined symbol: miEmptyData
[ 13.093] (EE) Failed to
load /usr/lib/xorg/modules/drivers/sis671_drv.so
[ 13.094] (II) UnloadModule: "sis671"
[ 13.094] (EE) Failed to load module "sis671" (loader failed, 7)
[ 13.094] (EE) No drivers available.
[ 13.094]
Fatal server error:
[ 13.094] no screens found

In 10.04 (Lucid) I had added sis671_drv.la and sis671_drv.so to /usr/lib/xorg/modules/drivers/
According to "ls /usr/lib/xorg/modules/drivers/" they are still there but they are the only two drivers that are colored green.

PART of /etc/X11/xorg.conf:
 Driver "sis671"
        VendorName "Silicon Integrated Systems [SiS]"
        BoardName "771/671 PCIE VGA Display Adapter"
        BusID "PCI:1:0:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device "Card0"
        Monitor "Monitor0"
        SubSection "Display"
                Viewport 0 0
                Depth 1
                Modes "800x600" "1280x1024" # "1680x1050"
        EndSubSection

The resolution with the live-usb of 10.10 is "800x600"