[ubuntu] [Karmic] Randomly lost my 1680x1050 resolution after switching NVidia to ATI

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http://ubuntuforums.org – A few weeks back my NVidia card committed suicide. I was using onboard graphics for a bit, but it was painful for Compiz. Upgraded to an ATI card about a week back and had no problems until my computer randomly freaked out in the middle of usage (literally was just watching a video when this happened) and kicked me from 1680x1050 to 1600x1200. Now I can't get 1680x1050 back on my choice of resolutions. I've modified xorg.conf about a billion times and am getting nowhere. From what I've read, it seems like Karmic doesn't use xorg as much and things are now "autodetected" http://ubuntuforums.org/showthread.php?t=800354 I can't seem to get this autodetect to work. Somebody please help. Let me know what more info I can provide and I'll gladly add it. Thanks, Neil (Hardware)