linux-kernel - Re: 3.9.0 + CONFIG_X86_INTEL_PSTATE=y -> ThinkPad T420 with i5 lost ACPI functionality

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Date:	Fri, 03 May 2013 21:36:54 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Toralf Förster <toralf.foerster@....de>,
	Dirk Brandewie <dirk.brandewie@...il.com>
Cc:	linux-acpi@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Dirk Brandewie <dirk.j.brandewie@...el.com>
Subject: Re: 3.9.0 + CONFIG_X86_INTEL_PSTATE=y  -> ThinkPad T420 with i5 lost ACPI functionality

On Friday, May 03, 2013 06:55:37 PM Toralf Förster wrote:
> The following file doesn't exists at my Gentoo Linux
> /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
> in 3.9.0 if I activate CONFIG_X86_INTEL_PSTATE=y 
> 
> That means, that a command like
> 
> $> echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
> 
> in /etc/rc.local is now no longer working.
> A high fan +  high temperature are the result, even if just the BOINC client
> is run with low prio (nice 19) in the back ground.
> 
> Manually loading the missing module won't work too :
> 
> $> modprobe acpi_cpufreq
> modprobe: ERROR: could not insert 'acpi_cpufreq': Device or resource busy
> 
> Is the behaviour a bug or a feature ?

The thermal management problem is not an intentional outcome, definitely.

> In the later case: How can I achieve the previous behaviour back ?
> 
> This issue might affect the RH EL kernel too [1] where I observed a similar behaviour.
> 
> 
> [1] http://elrepo.org/bugs/view.php?id=379

Dirk, is this the problem we were talking about recently or something else?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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