On Sat, Mar 22, 2008 at 06:54:05PM -0700, Arthur Mesh wrote:
> Hello,
> Found an interesting behavior on a Thinkpad T61 running a week old 
> 4.3-current i386 GENERIC. Whenever it boots plugged in to AC, dmesg 
> recognizes SpeedStep and hw.setperf becomes available through sysctl(8). 
> On the other hand, whenever it boots while it's on battery, dmesg 
> doesn't recognize SpeedStep. acpidump is attached. There is even a 
> subtle difference in dmesgs

change the bios settings that force the cpu to be throttled whenever on
battery.

works for me on my x61s.

Cheers,

-0-
-- 
Barometer, n.:
        An ingenious instrument which indicates what kind of weather we
are having.
                -- Ambrose Bierce, "The Devil's Dictionary"

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