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

[Rafael J. Wysocki]

On Tuesday, June 10, 2014 12:11:50 AM Martin Steigerwald wrote:
> Am Dienstag, 10. Juni 2014, 00:20:20 schrieb Rafael J. Wysocki:
> > 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:        +71.0ÂC  (crit = +98.0ÂC)
> > > > 
> > > > coretemp-isa-0000
> > > > Adapter: ISA adapter
> > > > Physical id 0:  +71.0ÂC  (high = +86.0ÂC, crit = +100.0ÂC)
> > > > Core 0:         +70.0ÂC  (high = +86.0ÂC, crit = +100.0ÂC)
> > > > Core 1:         +71.0ÂC  (high = +86.0ÂC, crit = +100.0ÂC)
> > > > 
> > > > 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 didnÂt 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?
> 
> I think I saw this with 3.15-rc7 as well. Not so sure about 3.15-rc5.
> 
> I now switched to acpi + ondemand governor which seems to work better, as I
> posted. I still hit cpu throttling, but well its hot inside here. And maybe the fan
> also needs some cleaning.
> 
> Anyway, need to get some sleep now. I can test with rc7, rc5 and probably
> some older rc as I still have those available. Will take some time tough.

Well, my point really is whether or not there is a kernel where you didn't have
this problem with intel_pstate (ie. there is a regression in intel_pstate).

Rafael

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