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

["Rafael J. Wysocki" <rjw@rjwysocki.net>]

On Tuesday, June 10, 2014 12:20:20 AM Rafael J. Wysocki wrote:
> 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?

Or is that just you have tried intel_pstate for the first time?

Rafael