linux-kernel - Re: [REGRESSION] 3.15: Seems to turbo mode Intel Sandybridge Dual Core without need, overheating CPU

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Message-ID: <1773550.hda5I1At4Q@vostro.rjw.lan>
Date:	Tue, 10 Jun 2014 00:20:20 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Martin Steigerwald <Martin@...htvoll.de>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [REGRESSION] 3.15: Seems to turbo mode Intel Sandybridge Dual Core without need, overheating CPU

On Monday, June 09, 2014 11:41:40 PM Martin Steigerwald wrote:
> Am Montag, 9. Juni 2014, 23:33:43 schrieb Martin Steigerwald:
> > Hi!
> > 
> > Added linux-pm to Cc. Also reboots seems to fix up the condition:
> > 
> > merkaba:~> grep . /sys/devices/system/cpu/cpu[0-3]/cpufreq/cpuinfo_cur_freq
> > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:830957
> > /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_cur_freq:819628
> > /sys/devices/system/cpu/cpu2/cpufreq/cpuinfo_cur_freq:800000
> > /sys/devices/system/cpu/cpu3/cpufreq/cpuinfo_cur_freq:813476
> > merkaba:~> sensors                                                         
> > acpitz-virtual-0
> > Adapter: Virtual device
> > temp1:        +71.0°C  (crit = +98.0°C)
> > 
> > coretemp-isa-0000
> > Adapter: ISA adapter
> > Physical id 0:  +71.0°C  (high = +86.0°C, crit = +100.0°C)
> > Core 0:         +70.0°C  (high = +86.0°C, crit = +100.0°C)
> > Core 1:         +71.0°C  (high = +86.0°C, crit = +100.0°C)
> > 
> > thinkpad-isa-0000
> > Adapter: ISA adapter
> > fan1:        3137 R
> > 
> > 
> > Still hot in here and after reboot and login into KDE session there is quite
> > some CPU activity for a while.
> > 
> > But way better than before.
> > 
> > I can test whether this also happens with ACPI cpufreq driver.
> > 
> > I think I didn´t see this with 3.14.
> 
> Its not just me:
> 
> Please change intel_pstate default to disable
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647

Did you test the 3.15-rc kernels?  If so, do they have this problem too?

Rafael

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