I have the same problem: 12.04 is fine, but 12.10 or 12.04.02 is broken. The output of "lspci -d 5333: -nn": 01:00.0 VGA compatible controller [0300]: S3 Inc. VT8636A [ProSavage KN133] AGP4X VGA Controller (TwisterK) [5333:8d02] (rev 01)
I have the same problem: 12.04 is fine, but 12.10 or 12.04.02 is broken. The output of "lspci -d 5333: -nn":
01:00.0 VGA compatible controller [0300]: S3 Inc. VT8636A [ProSavage KN133] AGP4X VGA Controller (TwisterK) [5333:8d02] (rev 01)