Confirming that the problem is present in fresh LiveUSB sessions of Ubuntu 9.04, but not Ubuntu 8.10.
In OpenArena, the corruption was present in all resolutions except for 1360x768 where the screen rendered everything rather normally aside from a flashing black box that occasionally appeared. I imagine that if the game had a native 1440x900 resolution mode, it would render similarly, if not perfectly.
Confirming that the problem is present in fresh LiveUSB sessions of Ubuntu 9.04, but not Ubuntu 8.10.
In OpenArena, the corruption was present in all resolutions except for 1360x768 where the screen rendered everything rather normally aside from a flashing black box that occasionally appeared. I imagine that if the game had a native 1440x900 resolution mode, it would render similarly, if not perfectly.