So I have come across a slight issue (I think). For s&g's I installed Open Arena for some old school fun and this is where my issues have arisen.
Open Arena is running quite slow (seen max 25fps but ave of about 8fps), I take this as it's a resolution issues. My screen is native 1920x1080, so the pi boots into this resolution. OA doesn't seem to be able to change out of this as I suspect is due to the Pi's HDMI setup.
I tried forcing the HDMI group and mode, this is where the problem is btw, and all it seems to be doing is dropping it straight to G:1 M:1 no matter what mode I set it to, if I change to G:2 i get no visuals (which I believe to be my screen, not the Pi).
Am I missing a key element to forcing the group and mode? Is there another setting I should be changing aswell?
Currently the set up is: Pi > HDMI > DVI > Screen. Audio Via 3.5mm.
Other than Group and mode changes config.txt is per Raspbian Wheezy standard. I have tried upping the GPU ram to 256MB, and booting only to terminal. other than getting FPS up to 25 (while not moving or looking at anything other than a blank wall) there was negligeable performance difference.