On further experimentation I have found that the video cutoff is triggered on
init by ureadahead, and will re-occur anytime ureadahead is reprofiled or was
last profiled on a boot invoking this bug. Since it does not occur with kernels
prior to 2.6.34-(anything)-generic, it must be in the kernel somewhere.
Removing /etc/init/ureadahead.conf and /etc/init/ureadahead-other.conf prevents
video cutoff, at cost of about 15 sec boot time penalty. Similar time penalty
or worse if video cutoff occurs with ureadahead.conf installed.
The boot time penalty of either accepting the video cutoff(which delays the
desktop) or removing ureadahead is significant but less that the time lost
fixing this after each and every update that reprofiles ureadahead.
If this but gets to the final release, people using the AMD 785 chipset will
need to install kernel 2.6.32-(anything)-generic, boot from it once so
ureadahead can get a good boot to profile, then boot the normal kernel. This
will have to be repeated any time an update reprofiles ureadahead.
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ATI Video output cuts off completely during boot for several seconds
https://bugs.launchpad.net/bugs/599196
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