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

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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
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