I did some more research (as if I hadn't google my fingertips off before :P) and it seems it's this issue seen with Doom3: http://zerowing.idsoftware.com/linux...d1aba2d5ba6336
Strange, Doom3 ran fine under 2.6.9. Trying this patch http://ck.kolivas.org/patches/2.6/2....ive_list.patch
Edit: Yes, that little patch did it. Time they move that kind of b0rking to a 2.7 branch.