Recent 6-beta issue: high delay when loading kernel on thinkpad on battery

[Martin Cracauer]

I cannot nail down when exactly this issue was introduced but I think
it was recently.  I remember to boot this laptop fine when on battery
during summer.

Recent 6-betas make my thinkpad R40 wait for 80 seconds when loading
the kernel (after announcing kernel version but before probing
devices), when it is on battery power.  On A/C the delay is normal.

This is a boot -v screenshot photo of the stage where it is hanging:
http://wavehh.dyndns.org/tmp/thinkpad-6beta-delay.jpg

As you can see, -v doesn't give a clue what it is doing.  It is
hanging there doing nothing before reloading the kernel modules.

dmesg, acpi stats, kernel config etc is all on:
http://www.cons.org/cracauer/machines/grisu/

I just updated these files to be from a -v boot when on A/C.

Any idea what this can be caused by? Any additional tests or info I
can provide?

Martin
-- 
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Martin Cracauer <cracauer at cons.org>   http://www.cons.org/cracauer/
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 stepping on the keys. No, I don't have an infinite number of cats.