Broken APIC on my laptop or bug in FreeBSD?

[Giorgos Keramidas]

On Sun, 20 Jul 2008 01:33:30 +0300, Giorgos Keramidas <keramida at ceid.upatras.gr> wrote:
> On Sat, 19 Jul 2008 17:03:08 -0400, "Alexandre \"Sunny\" Kovalenko" <gaijin.k at gmail.com> wrote:
>> Are you by any chance using cx_lowest="C3" (or "LOW") in your
>> rc.conf? I have seen these symptoms (including mouse inducement of
>> the typed characters) when cpu0 on my laptop went to C3. Nowadays I
>> have C3 on cpu1 and C2 on cpu0 and life is good. Then again, I am
>> running RELENG_7 (which AFAICR was 7-CURRENT at the time), so YMMV.
>
> Ah, good point.  I have indeed performance_cx_lowest="LOW" in rc.conf.
>
> I'll remove that and try again with the APIC enabled...

That was it.  Thanks!

  # sysctl -a | egrep -e 'cx_(usage|support)'
  dev.cpu.0.cx_supported: C1/1 C2/1 C3/57
  dev.cpu.0.cx_usage: 100.00% 0.00% 0.00%
  dev.cpu.1.cx_supported: C1/1 C2/1 C3/57
  dev.cpu.1.cx_usage: 100.00% 0.00% 0.00%

With anything except "C1" the CPU is obviously too slow to do anything
useful :-)