[Bug 217247] [acpi] r265474 makes 11.0R unusable with Atom 330

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217247

--- Comment #8 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Stéphane Lesimple from comment #7)
I also asked for sysctl output.

>From what I see in the dmesg, your CPU's LAPIC does not work in C2/C3.  The
fact that TSC is also not invariant forced the kernel to disable C2/C3
entrance, which you noted as well.

There is also r309189 which downgrades LAPIC eventtimer quality.  I am not sure
that the commit is important for your machine, since it refuses to enter C2 at
all.

Yes, I probably also want to see verbose dmesg and sysctl output for 11.0.  I
might provide a recipe to restore C2/C3 usage after I see the data.

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