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

["Rafael J. Wysocki" <rjw@sisk.pl>]

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.