This command eliminates BLACK EDGES from BIG screens like 50" Panasonic TX-P50X10Y plasma. might work with others aswell.
sudo aticonfig --set-pcs-val=MCIL,DigitalHDTVDefaultUnderscan,0
HUGE Thanks for KULIMAZI who picked it from http://wiki.cchtml.com/index.php/Configuring
I bookmarked and browsed through it also, but the THING was well hidden among the DUAL HEAD stuff. I'm VEEERY happy now. I searched the solution for this too long.
i'm embarassed to say how long BUT this is the GREATEST thing ever happened to me with linux. ..and i knew it can't be so complicated. See Kulimazi's reply in this
Ubuntu topic about year ago http://ubuntuforums.org/showthread.php?t=1409508 simple, beautiful and genious ...