Comment 73 for bug 33617

I just saw this problem on a clean install of Feisty 7.04 on a T20 - it was intermittent while I was installing, so I did actually manage to install off the live CD. But after I enabled ACPI (by adding acpi=force to the boot options) X never started again, just hung with a blank screen.

Adding
 Option "BusType" "PCI"
to the xorg.conf file as described above fixed it for me.

As a side note: DRI also works (the bit depth in the default install is set to 16). Also, someone mentioned adding savage to /etc/modules, but I did not need to do this.