Hello, some news about the bug: I had the occasion to temporarily change my graphics card and try a Radeon 9250 (detected as "9200PRO 5960"). Doing so my 1400x1050 mode definition was accepted and I could use it. So the bug may be related to the tdfx driver, or, the other way round, the radeon driver does something to enable the acceptance of the mode. -- Hope this helps, Fabien.