This happens to me as well. I'm running Edgy on a thinkpad laptop with a
Radeon 9600-based card. Using the 'radeon' driver, external VGA works
fine, but DVI doesn't work. When using fglrx, everything works fine.
Another thing that may be related:
cat /proc/acpi/ibm/video
shows "dvi: disabled" when using radeon, and "dvi: enabled" when using fglrx.
This cannot be changed (in either case) by doing:
echo dvi_enable/disable > /proc/acpi/ibm/video
--
[radeon] can't do dual-link tmds, or second tmds transmitter
https://launchpad.net/bugs/27466
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