[mythtv-users] Open Radeon drivers with cloned displays, or proprietary drivers with Mythtv?

[PlainFaceBoy]

The proprietary radeon drivers work ok for me in that I can use my HDMI and 
VGA screens cloned at 1280x768, and I can adjust the overscan on the HDMI  - 
using the Catalyst control centre. Card is a HD 7750.

Big problem is though, I can't get into my Mythtv set up menus - front end 
(some eg video playback) or back end set up.
See my previous post - "Mythtv - backend set up, and some frontend menus not 
working (with Radeon 7750)". I select them, but nothing happens, but I can 
escape out back to the menu.

My two options seem to be get the mythtv menus to work with the proprietary 
drivers?

Or go back to the open drivers.
I know these work ok with mythtv, as I removed the proprietary drivers and 
it was ok....
But, can anyone help me set these up so I can use two cloned 'displays' 
(both on same TV - VGA and HDMI).
Cloning only works with resolutions common to both - highest is 640x480, so 
not really much good.
HDMI is always off the edge of the screen as well, but there's no option to 
adjust overscan?
With the proprietary drivers and the catalyst control centre I could adjust 
these, and  I had other options for resolutions for both eg 1280x768 - but 
these doesn't exist in the display settings with the open driver.
I tried creating a xorg.conf file and editing that, but that didn't work out 
well :-/

Can anyone help?