Re: HP nc6400 v.03 or v.05 laptop ACPI fails after reboot, works again after booting windows

["Lincoln Baxter, III" <lincolnbaxter@gmail.com>]

> It was suggested to me to open a kernel bug (possibly starting under
> ACPI), however I never got to it.. I don't know where kernel bugs are
> reported officially, and was busy at the time. (still am). I do try and
> reply to others with the same problems though... finding the webpage
> which suggested that fix was not trivial!
>
> My lid switch is just above the keyboard, on the right hand side of the
> left hand screen hinge. It is just a tiny piece of plastic protruding
> from the case. Push it, and the screen goes off. Hold it, and wiggle the
> mouse (touchpad), and the naughty screen comes back on.
>
> Most importantly for me, the workaround brings the max CPU speed
> available with speed step back to what it is supposed to be on my
> laptop, and the BIOS actually boots much faster.
>
> Peter C.
>
>
>   

Well. I just tested the lid, and I don't seem to have that problem.
I also don't think I have an external lid-switch, because I really can't 
find it anywhere... anyway.

Your workaround got me past the buggy/slow booting; however, there's 
another problem that I've found that is just about as annoying. And I'm 
hoping that someone will have an idea.

When I boot the computer with ACPI support, there's an audible hum that 
comes from the CPU whenever the processor is idle.
This hum does not occur in windows, and when I boot with "noapic 
pci=noapic acpi=off" in the kernel options, the sound is gone.

Does anyone have any ideas how I can fix this? Is it possible to load 
ACPI as a module? Should I play around with which ACPI features are 
compiled in, and see which one, if it is just one, is the kicker?

Thanks again for all of your help,
Lincoln