Problems with Dual Display with Radeon Mobility 7500

[William M. Quarles]

Marko Vojinovic wrote:
> 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

Cool, I just ran xrandr --output VGA-0 --left-of LVDS and it worked!

So if I were to report a bug in the Gnome tool that seems to be screwing 
this up, should I report it against the gnome-display-properties 
application, and thus the control-center RPM? Or should I report it 
against something at a lower level?

Thanks,
William