Re: cpufreq limits avilable frequencies to 800MHz on git kernel

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From: Thomas Renninger
Date: Tuesday, May 27, 2008 - 2:35 am

On Mon, 2008-05-26 at 18:15 +0200, Arkadiusz Miskiewicz wrote:
This looks ok...
I'd expected:
[ 4216.175414] cpufreq-core: CPU 0: _PPC is 4 - frequency limited
Then it should be limited and get unlimited with e.g.:
[ 4216.175414] cpufreq-core: CPU 0: _PPC is 0 - frequency not limited

AFAIK, max_freq should only get limited via passive cooling or explicit
BIOS limitation via _PPC.

The video driver is rather broken, especially on ThinkPads arbitrary HW
might get accessed, better blacklist video in modprobe.conf for now.
Probably unrelated, just to be sure...

Some strange frequency targets, min freq is 800.000 Khz, I wonder where
these values are coming from:
May 26 17:40:57 tarm kernel: [ 2319.124990] cpufreq-core: target for CPU
0: 400000 kHz, relation 0
May 26 17:40:57 tarm kernel: [ 2319.125141] acpi-cpufreq:
acpi_cpufreq_target 400000 (0)
May 26 17:59:39 tarm kernel: [ 3441.125163] cpufreq-core: target for CPU
0: 571428 kHz, relation 0
May 26 17:39:57 tarm kernel: [ 2259.125137] cpufreq-core: target for CPU 0: 342857 kHz, relation 0


The bad seems to happen at the end at 17:59 (the rest of the logs should
be rather uninteresting). There the frequency gets limited to 800. Then
every about 2-3 (18:02, 18:04)  mins something odd is happening:
The limitation falls away (2000 is allowed again) and ten seconds later
the frequency is limited again.

It already starts before...:
17:59:54 limited to 800
18:02:15 unlimited, max_freq 2000
18:02:28 limited to 800
18:04:20 unlimited, max_freq 2000
18:05:14 limited to 800
18:07:00 unlimited, max_freq 2000
18:10:34 limited to 800


Sorry, but I currently do not have time to look deeper at this.
I try to look at it the next days, if I haven't answered until Sa, I
won't be able to for the next 2 weeks.

   Thomas

(stripped)
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Messages in current thread:
cpufreq limits avilable frequencies to 800MHz on git kernel, Arkadiusz Miskiewicz, (Fri May 23, 10:44 am)
Re: cpufreq limits avilable frequencies to 800MHz on git k ..., Arkadiusz Miskiewicz, (Sun May 25, 2:36 am)
Re: cpufreq limits avilable frequencies to 800MHz on git k ..., Arkadiusz Miskiewicz, (Mon May 26, 12:07 am)
Re: cpufreq limits avilable frequencies to 800MHz on git k ..., Arkadiusz Miskiewicz, (Mon May 26, 9:15 am)
Re: cpufreq limits avilable frequencies to 800MHz on git k ..., Arkadiusz Miskiewicz, (Mon May 26, 9:23 am)
Re: cpufreq limits avilable frequencies to 800MHz on git k ..., Thomas Renninger, (Tue May 27, 2:35 am)
[PATCH] Re: cpufreq limits avilable frequencies to 800MHz ..., Thomas Renninger, (Thu Jul 17, 6:48 am)