Problems with Dual Display with Radeon Mobility 7500

Marko Vojinovic vvmarko at gmail.com
Fri Aug 21 22:08:27 UTC 2009


On Friday 21 August 2009 18:20:06 William M. Quarles wrote:
> I'm trying to set up a spanning desktop on my Dell Latitude C640 laptop,
> which has an ATI Radeon Mobility 7500 graphics chipset and a Dell 1504FP
> LCD monitor in analog (VGA) mode. I use Gnome on Fedora 10.
>
> I can (sometimes) get the spanning desktop to work using
> System/Preferences/Hardware/Screen Resolution from the Gnome menu with
> the laptop configured to be on the left, and the external display
> configured to be on the right. However, this is actually the opposite of
> my physical setup at my desk. Every time that I try to switch the
> displays to their actual layout, the desktop still spans, but the
> displays are mirrored, which is not only useless, but can also cause
> problems, especially when sometimes it results in the display without
> the top and bottom bars missing (!). Does anybody know how I can get
> this work properly with the laptop on the right and the external monitor
> on the left?

I would try to do it from the command line first, using xrandr. You can put all 
desktops left, right, up, down of each other, overlap, rotate, reflect 
sideways, upside-down, inside-out, and whatnot...

When you sort out the options that make it work as you wish, you can put it in 
~/.login or /etc/rc.local or whereever...

man xrandr

HTH, :-)
Marko





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