linux-kernel - Re: bug? acpi p-state + ondemand keeps dropping max freq

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Message-ID: <20080607213918.GC1746@elf.ucw.cz>
Date:	Sat, 7 Jun 2008 23:39:18 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	pavel@...e.cz, auke-jan.h.kok@...el.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	len.brown@...el.com, cpufreq@...ts.linux.org.uk,
	davej@...emonkey.org.uk
Subject: Re: bug? acpi p-state + ondemand keeps dropping max freq

Hi!

> I've consistently experienced the following bizarre problem since 2.6.20, all the
> way up to 2.6.25.3 (regressed yesterday and each of these kernels exposes this
> behaviour):
> 
> /sys/devices/system/cpu/cpu0/cpufreq # grep . *
> affected_cpus:0
> cpuinfo_cur_freq:800000
> cpuinfo_max_freq:1866000
> cpuinfo_min_freq:800000
> scaling_available_frequencies:1866000 1600000 1333000 1066000 800000
> scaling_available_governors:ondemand performance
> scaling_cur_freq:800000
> scaling_driver:acpi-cpufreq
> scaling_governor:ondemand
> scaling_max_freq:800000
> scaling_min_freq:800000
> 
> 
> 
> Notice that scaling_mx_freq dropped down to the lowest possible value and as such
> my CPU is only working at 800MHz. At boot time this field properly displays
> 1866MHz and everything works OK. After a certain period (?) this value drops down
> and I cannot manually elevate it back to the normal level:
> 
> # echo 1866000 > scaling_max_freq ; cat scaling_max_freq
> 800000
> # echo 1866000 > scaling_max_freq ; cat scaling_max_freq
> 800000
> 
> 
> This renders my Dothan to utterly poor speeds. (standard T43)
> 
> performance cpufreq governor makes no difference - I still can't change the
> frequency upper/lower values.

Hmm, I have similar problem in Novell bugzilla, on very different hw:

https://bugzilla.novell.com/show_bug.cgi?id=396311

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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