Sucess with dual monitors

[Marius Gedminas]

On Sat, Jun 24, 2006 at 10:22:12PM +0100, phenix777 wrote:
> Regardin xorg.conf:
> 
> I have 2 Devices set
> 
> I have 2 Monitors set
> 
> I have 2 Screens set
> 
> 
> 
> These all work fine.  X froze on me a few times but now it's running
> fine.  However, what I have is two mirrored monitors.
...
> If it helps, here is the relevant portion of xorg.conf:
> 
> =====
> Section "Device"
> 	Identifier	"ATI Technologies, Inc. RV350 AP [Radeon 9600]"
> 	Driver		"ati"
> 	BusID		"PCI:01:00:0"
> 	Screen 0
> 	Option		"UseFBDev"	"true"
> EndSection
> 
> Section "Device"
> 	Identifier	"ATI Technologies, Inc. RV350 AP [Radeon 9600] Secondary"
> 	Driver		"ati"
> 	BusID		"PCI:01:00:1"
> 	Screen 1
> 	Option		"UseFBDev"	"true"
> EndSection

I heard that you have to specify the *same* BusID for both heads if you
have a Radeon card and want Xinerama.  The second PCI ID is just a fake
to enable Windows to recognize that this card is able to do dual-head.

So, try BusID "PCI:01:00:0" in both Device sections.  It worked for me
with my Radeon 7500.

Alternatively, you may want to try MergedFB mode.  It has certain
advantages: you can switch between dual-head and clone mode without
restarting X (and killing all open programs).  There was a time when
Xinerama was incompatible with DRI (3D acceleration), and the only way
to get both DRI and dual-head was to use MergedFB.

Marius Gedminas
-- 
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