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External Monitor from PowerBook5,6

On Fri, Apr 08, 2005 at 09:11:40AM +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2005-04-07 at 17:07 +0200, Bernhard Reiter wrote:
> > I am having a post Februaray Powerbook5,6 here with German keyboard
> > 
> > Someone told me that xorg releases could do external SVGA mirroring
> > for the previous powerbook models 15" with ati. Did somebody test this
> > with the new February Powerbook 15" model?
> It should work

Trying 6.8.2 I have problems.
(there are nice instructions to compile it on

It seems that most options of Mirroring and the CRT2 in the radeon drivers
need to use MergeFB. However so far I can only see something if I 
specify Option "UseFBDev" "true" and thus MergeFB gets disabled.
When MergeFB is in place, even without error messages I have a black
laptop screen (with one horizontal dark line in the lower part).
Whether I have a second screen attached or not makes no difference.

Trying multihead with two Screens after the example from
also was not successful. I tried with VGA Flatpanel what has 1280x1024 
dimensions. This was also unsuccessful.
When enabling UseFBDev for the second screen then I could see something
on it: Moving the mouse. Still it was not working in a way that it
could be used at all.

What should I try to come closer to a useful Mirror mode?
Can somebody confirm that UseFBDev is required for the laptop panel?

> > lspci -v
> > 0000:00:10.0 VGA compatible controller: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10] (prog-if 00 [VGA])
> >         Subsystem: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]
> >         Flags: bus master, 66MHz, medium devsel, latency 255, IRQ 48
> >         Memory at b8000000 (32-bit, prefetchable) [size=128M]
> >         I/O ports at 802400 [size=256]
> >         Memory at b0000000 (32-bit, non-prefetchable) [size=64K]
> >         Expansion ROM at f1000000 [disabled] [size=128K]
> >         Capabilities: [58] AGP version 2.0
> >         Capabilities: [50] Power Management version 2

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