Hello Mathew,
Sorry, I didn't see that you are using fglrx. I think there's a catalyst GUI or something with the overscan options. I can't help you there though because I've only ever used xf86-video-ati. Additionally, your monitor may have overscan settings. Unfortunaly i have no choice. xf86-video-ati does not support my Ati 7750.
Thanks for your help, you pointed me to sometign i could investage. So after some time here is the solution aticonfig --set-pcs-val=MCIL,DigitalHDTVDefaultUnderscan,0 As root, this persist between reboots, but not between driver upgrades (not tested myself yet). Another option can be adding this to your $HOME/.xprofile aticonfig --set-dispattrib=dfp5,positionX:0 aticonfig --set-dispattrib=dfp5,positionY:0 aticonfig --set-dispattrib=dfp5,sizeX:1920 aticonfig --set-dispattrib=dfp5,sizeY:1080 Being dfp5 the name of your devive. also adjusting the resolution of course. -- Regards, Alfredo Palhares