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

[bob franken]

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

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