Re: cpufreq and kernel >2.6.15.6 is limited

[Eric Sandall <eric@sandall.us>]

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Robert Hancock wrote:
> Dave Jones wrote:
>> On Tue, May 30, 2006 at 05:25:26PM -0700, Eric Sandall wrote:
>>  >  > It seems that any kernel on my Dell Inspiron 5100 after 2.6.15.6
>>  > (including 2.6.17-rc5) 'breaks' my cpufreq in that up to and including
>>  > 2.6.15.6 I can scale between 300MHz-2.4GHz, but after (starting with
>>  > 2.6.16) I can only scale between 2.1GHz and 2.4GHz.
>>  >  > I've attached the files, sorted by kernel, I assume may be
>> helpful. Let
>>  > me know if you need any more.
>>
>> It may have worked in the past, but the CPU has an errata which makes
>> it an unsafe operation to scale below 2GHz.
> 
> There was some discussion about whether this was correct or not in this
> thread:
> 
> http://groups.google.ca/group/fa.linux.kernel/browse_thread/thread/d5b5905d7f1aa221/66c41ee3a26583b3
> 
> 
> Did this ever get resolved? From my reading of the N60 erratum,
> disabling the 12.5% duty cycle sounds like this should be enough,
> disabling everything under 2GHz is not necessary..

I would definitely prefer that approach of removing the problem
frequency rather than all 8.

- -sandalle

- --
Eric Sandall                     |  Source Mage GNU/Linux Developer
eric@sandall.us                  |  http://www.sourcemage.org/
http://eric.sandall.us/          |  SysAdmin @ Shock Physics @ WSU
http://counter.li.org/  #196285  |  http://www.shock.wsu.edu/
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