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

[Alex Deucher]

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