Screen Scaling Issues
> 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
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
As root, this persist between reboots, but not between driver upgrades (not tested myself
Another option can be adding this to your $HOME/.xprofile
Being dfp5 the name of your devive. also adjusting the resolution of course.