Date: Thu, 02 Apr 2009 10:51:22 -0400 From: Pierre-Luc Drouin <pldrouin@pldrouin.net> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-acpi@freebsd.org Subject: Re: Wrong dev.cpu.0.freq_levels values Message-ID: <49D4D0EA.1050108@pldrouin.net> In-Reply-To: <200904020908.00723.jhb@freebsd.org> References: <20090402033543.43DDD1CC0B@ptavv.es.net> <200904020908.00723.jhb@freebsd.org>
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John Baldwin wrote:
> On Wednesday 01 April 2009 11:35:43 pm Kevin Oberman wrote:
>
>>> Date: Wed, 01 Apr 2009 23:16:13 -0400
>>> From: Pierre-Luc Drouin <pldrouin@pldrouin.net>
>>> Sender: owner-freebsd-acpi@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
>
> Hmm, that means one of the cpufreq drivers is busted I think. Can you try
> disabling all of them to see which one is the problem (est perhaps?) Also,
> can you show the 'devinfo' output for your cpu0 device (and its child
> devices) in the cpufreq and non-cpufreq cases?
>
>
est0 seems to be the problem. When I have the cpufreq driver in my
kernel, that I disable est0 and that I leave p4tcc0 and acpi_throttle0
enabled, the output from sysctl is right. If I disable p4tcc0 and
acpi_throttle0 and that I leave est0 enabled, the highest level is 1500
rather than 2000. Here is the output from devinfo that concerns cpu0:
cpu0 pnpinfo _HID=none _UID=0 at handle=\_PR_.CPU0
ACPI I/O ports:
0x1014
0x1015
0x1016
est0
p4tcc0
acpi_perf0
acpi_throttle0
cpufreq0
Pierre-Luc Drouin
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