Powerd makes computer hang

[Nate Lawson]

Kevin Oberman wrote:
>> Date: Thu, 24 Aug 2006 16:47:38 +1000
>> From: Peter Jeremy <peterjeremy at optushome.com.au>
>> Sender: owner-freebsd-acpi at freebsd.org
>>
>>
>> --jRHKVT23PllUwdXP
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>> I've just upgraded my HP nx6125 to an up-to-date -current and
>> my powerd(8) emulator[1] still wedges it solid.
>>
>> [1] A perl script that pseudo-randomly changes dev.cpu.0.freq
> 
> Also, I think that debug.cpufreq.lowest can be used to limit the low
> speed and avoid the ones that cause hangs.

That, and if you find the problem driver, you can just disable it 
individually.  example:
hint.p4tcc.0.disabled="1"

If that doesn't work, try disabling acpi_throttle the same way. 
Figuring out which cpufreq drivers are attached on your system would be 
a good start (dmesg | grep cpu).

All other cpufreq drivers will continue to function just fine.  That's 
why the title of this message is misleading.  cpufreq is a framework, 
not a single driver.  It's like saying "PCI makes my system hang".

-- 
Nate