Powerd makes computer hang

[Nate Lawson]

Tim Dettloff wrote:
> Hi
> 
> I have installed FreeBSD 6.1-RELEASE on my Compaq Presario 2656AU
> laptop, but it occasionally hangs. I traced the problem to powerd so I
> made a script that kept changing the clock rate by setting the sysctl
> dev.cpu.0.freq. This script normally makes the computer hang within 10
> seconds or so.
> 
> I then added a few printf's here and there which have let me to
> believe that the problem is somewhere in
> sys/dev/acpica/acpi_throttle.c, acpi_thr_set
> It only prints the first letter of a printf just after the line
> THR_SET_REG(sc->cpu_p_cnt, p_cnt);
> 
> The problem happens with and without cpufreq.ko loaded. The kernel is 
> GENERIC.
> 
> Any Ideas?

dmesg would be a good start.  Is there some cpufreq driver running 
besides acpi_throttle?  Add hint.acpi_throttle.0.disabled="1" in 
loader.conf, reboot, and then retry your test.

My guess is acpi_throttle is just a wrapper around p4-tcc on your system.

-- 
Nate