ATI Radeon 7500 Mobile (On Dell 5100) with External Monitor

[bob franken]

>From: Alex Deucher <alexdeucher at gmail.com>
> > >On Wed, 02 Mar 2005 11:12:37 -0500, bob franken <zonyl at hotmail.com> 
>wrote:
> > > > Hi All,
> > > >
> > > >    I have an ATI Radeon 7500 Mobile video card in my Dell 5100 that
> > >doesnt
> > > > appear to play nice when I hookup up an external monitor.   My 
>laptop
> > >LCD
> > > > alone works with the config generated by X -configure, however, when 
>I
> > >plug
> > > > in an external monitor, neither display then works.  I noticed that
> > >X.org is
> > > > showing drastically different information about the DAC detected for
> > >Primary
> > > > and Secondary devices when the ext monitor is connected and when it 
>is
> > >not
> > > > (possibly DDC is getting messed up?)
> > > >
> > > >    I tried all sorts of different options in the ATI man page, 
>without
> > >any
> > > > success in getting both displays working at the same time
> > >(MonitorLayout,
> > > > MergedFB, CRT2xxxx, etc).
> > > >
> > > > My config:
> > > > http://www.sharpee.com/xorg.conf.new
> > > > Without ext monitor (LCD works fine)
> > > > http://www.sharpee.com/noext.txt
> > > > With ext monitor (Neither display works)
> > > > http://www.sharpee.com/yesext.txt
> > > >
> > > >     Any help would be greatly appreciated!
> > > >
> > > > Thanks,
> > > > -J
> > > >
> > >
> > >it's not detecting your setup correctly.  to force the correct
> > >configuration, uncomment this line:
> > >Option     "MonitorLayout" "LVDS, CRT"
> > >what are yout trying to accomplish?  dualhead?  clone?
> > >
> > >Alex
> >
> > Enabling the MonitorLayout allows the LCD to show up when the ext 
>monitor is
> > displayed, however, I still get no video on the ext monitor.   At a high
> > level, I am just trying to use my ext monitor (NEC: G90FB) with my 
>laptop
> > (in clone mode) when docked.
> >
> > new config (with MonitorLayout and MergedFB enabled):
> > http://www.sharpee.com/xorg.conf.merged
> >
> > new out:
> > http://www.sharpee.com/mergedfb.out
> >
> > Thanks
> > -J
> >
>
>The external monitor is trying to use 2048x1536, I supect you need to
>specify some modes in the screen section of your config:
>
>	SubSection "Display"
>		Viewport   0 0
>		Depth     16
>                Modes           "1024x768" "800x600" "640x480"
>	EndSubSection
>

Added those modes and still dont see anything on my ext monitor.   FWIW: 
Every other time I initially start the X server the external monitor jumps 
out of power save mode for a couple of secs then returns to power save mode.

config with modes:
http://www.sharpee.com/xorg.conf.modes
output with modes:
http://www.sharpee.com/modes.txt

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