Wrong dev.cpu.0.freq_levels values

[Pierre-Luc Drouin]

Kevin Oberman wrote:
>> Date: Wed, 01 Apr 2009 23:16:13 -0400
>> From: Pierre-Luc Drouin <pldrouin at pldrouin.net>
>> Sender: owner-freebsd-acpi at freebsd.org
>>
>> I tried disabling both p4tcc and acpi_throttle by putting the following 
>> in /boot/device.hints:
>> hint.p4tcc.0.disabled="1"
>> hint.acpi_throttle.0.disabled="1"
>>
>> It reduced the number of levels, but I still don't have a level 2000 as 
>> I used to get:
>> dev.cpu.0.freq: 1500
>> dev.cpu.0.freq_levels: 1500/-1 1200/-1 1000/-1 800/-1 600/-1
>> dev.est.0.%desc: Enhanced SpeedStep Frequency Control
>> dev.est.0.freq_settings: 1500/-1 1200/-1 1000/-1 800/-1 600/-1
>>
>> Pierre-Luc Drouin
>>
>> Nate Lawson wrote:
>>     
>>> Pierre-Luc Drouin wrote:
>>>   
>>>       
>>>> Hello,
>>>>
>>>> I have noticed that FreeBSD gets the wrong CPU frequency levels for my
>>>> Pentium M 2GHz. It used to work correctly with older versions of
>>>> FreeBSD, but I noticed that this was not working properly when I
>>>> installed 7.1 and this is still not working with -stable:
>>>>
>>>>     
>>>>         
>>>   
>>>       
>>>> dev.cpu.0.freq: 1500
>>>> dev.cpu.0.freq_levels: 1500/-1 1312/-1 1200/-1 1050/-1 1000/-1 875/-1
>>>> 800/-1 700/-1 600/-1 525/-1 450/-1 375/-1 300/-1 225/-1 150/-1 75/-1
>>>> dev.est.0.%desc: Enhanced SpeedStep Frequency Control
>>>> dev.est.0.freq_settings: 1500/-1 1200/-1 1000/-1 800/-1 600/-1
>>>>
>>>> Is there a way to fix this?
>>>>     
>>>>         
>>> There's nothing wrong. You just got more levels using p4tcc (another
>>> cpufreq device). So use it as-is, or disable the p4tcc driver and
>>> acpi_throttle drivers.
>>>
>>>       
>
> There is a problem, of course. I had the same issue with my 2GHz Pentium
> M. It was easy to fix, but totally counter-intuitive.
>
> Build your kernel without "device cpufreq" and it will all work
> fine. Here is what I see without CPUFREQ:
> dev.cpu.0.freq_levels: 2000/27000 1750/23625 1600/22600 1400/19775 1333/19666 1166/17207 1066/16733 932/14641 800/13800 700/12075 600/10350 500/8625 400/6900 300/5175 200/3450 100/1725
>
> These are the correct values.
>
> Also, when on battery, the CPU changes the available frequencies so that
> the top one is 800 MHz. This is not a powerd thing. It's entirely BIOS.
>   
Yep, that did it. Thanks! This is quite counter-intuitive effectively!

Pierre-Luc Drouin