[gentoo-laptop] Dell Inspiron boot on battery slowness

[Will Briggs <will@burnieanglican.org.au>]

G'day all,

Having an interesting phenomenon when I boot my Dell Inspiron 6400 to
linux without AC plugged in.  The boot process is as slow as a dog, all
the fans are maxed "on", and cpufrequency shifting gets stuck at 1 GHz
like the governor is not working (and the slowness is more than what the
cpu frequency shifting would cause).

However if I boot with AC and then unplug it everything works well under
battery - cpu steps up and down with demand, fans behave properly etc.

I wondered at first if the BIOS switches stuff off under battery so that
various modules don't load or something but there's nothing obvious in
dmesg and lsmod looks fine - and I've check out BIOS settings to see if
there's anything - and there isn't.

Any clue where to begin diagnosing such an issue?

W.
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