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

[Alex Deucher]

On Wed, 02 Mar 2005 13:54:17 -0500, bob franken <zonyl at hotmail.com> wrote:
> 
> 
> >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 


Alex