On Fri, 2016-11-04 at 21:44 +0100, Pavel Machek wrote:

Hi!

quoted

quoted

Let me try v4.9-rc2... that works ok (cpus at the high frequency
during the kernel build). Unfortunately that sends my cpus to 99C
temperature range (and eventually forces emergency shutdown).

This we have to debug. Do you see same line like 
"
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit:1000000
"
If not we need
to find out why.

I'd prefer mails over bugzilla for now...

4.9-rc2 has bios_limit:

pavel@duo:~$ cat /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
1833000

and it has thermal zones:

/sys/devices/virtual/thermal/thermal_zone0/trip_point_0_temp 127000
/sys/devices/virtual/thermal/thermal_zone0/trip_point_0_type critical
/sys/devices/virtual/thermal/thermal_zone1/trip_point_0_temp 97000
/sys/devices/virtual/thermal/thermal_zone1/trip_point_0_type critical
/sys/devices/virtual/thermal/thermal_zone1/trip_point_1_temp 92500
/sys/devices/virtual/thermal/thermal_zone1/trip_point_1_type passive

It will not act if there is no binding information. Do you have more
files in this folder?

grep -r . * in /sys/class/thermal will be helpful.

..so it should slow down CPU at 92C.

So lets push the temperature up a bit...

sudo watch cat /proc/acpi/ibm/thermal
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit
/sys/devices/virtual/thermal/thermal_zone1/temp  /sys/devices/system/
cpu/cpu0/cpufreq/cpuinfo_cur_freq

temperatures:   98 49 -128 85 28 -128 28 -128 49 58 -128 -128 -128
-128 -128 -128
1833000
95000
1833000

Hmm. bios_limit does not seem to change, even when the temperature is
clearly above the trip point. (It is also interestng that acpi/ibm
reports bigger temperatures than
/sys/devices/virtual/thermal/thermal_zone1/temp . I have seen 103C
there.)

Probably they are showing package and core temperature or have a
different sampling interval.

Try enabling thermald service in Debian. it has access to more knobs to
control thermals.

Thanks,
Srinivas