Wow!  You're right.  I should have gone back and reviewed the earlier
log files.

In the learning I've done since jumping into this situation, I think I
understand what your problem is:

In the situation when the EDID transfer is good, if the display offers a
mode line that the BIOS does not support, you will lose.

In the Xorg.log file you attached on 3/9/2007, indeed there's a good
EDID transfer.  A detailed modeline is supplied for 1280x800, but then
there are no 1280x800 configurations offered by the BIOS.  (If I've
understood how the log file works, and my assumption that the detailed
mode specs are from the BIOS, whereas the 1280x800 spec is from the
monitor.)

I have also been tracking my symptom in another bug.  I apologize for
inadvertently hijacking your bug.

-Bill

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[regression] 7.2 broke vesa: "No matching modes found"
https://bugs.launchpad.net/bugs/89853
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