Just an update to post #182, I was able to restore functionality only by
reinstalling from the 10.04.1 ISO distribution image that had the
2.6.32-24 kernel.

I used meld to compare my two machines running 2.6.32-25, the one that
was broken had been updated to 2.6.32-26 by update manager, then I tried
to go back to 2.6.32-25. This left slight differences (0.1 rev) in Xorg
and Plymouth that maybe were related to this bug. Anyway, there was no
way I could find to get back to the state where the internal monitor
would come on without plugging in an external monitor, even under
previous kernels linked by grub and the recovery modes.

The version of plymouth on the working machine was 0.8.2-2ubuntu2, the broken 
was 0.8.2-2ubuntu2.1
the version of Xorg on the working machines was xserver-common 
2:1.7.6-2ubuntu7.3 and broken version was 7.4. Similarly grub had slight 
differences version 1.98-1ubuntu7 to 1.98-1ubuntu8. From what I can tell by 
reading various wikis, hard to image much else video related other than 
plymouth and xserver is running at the time the splash screen goes dark after 
grub menu. Plugging in a monitor during the plymouth splash or the login screen 
instantly would restore the internal display.

Looking forward to hearing some more test reports of the ppa kernel post
and bios fix of previous two posts.  I may be able to dedicate one
machine to testing later this week.

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https://bugs.launchpad.net/bugs/561802

Title:
  [i915] blank screen on Latitude E6410 (NOT E6510)

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