Comment 2 for bug 154290

Indeed. I managed to get some games to go to fullscreen, but then they on their own switched back to windowed, while playing (no, I didnt pressed alt-enter).

This is not Xgl only. I disabled Xgl (I think) with the disabled .configs option, but still same thing (although other things did improve instead)

ubuntu 8.04 amd64 nvidia 8600 gt