https://bugzilla.kernel.org/show_bug.cgi?id=100121
Bug ID: 100121
Summary: CPU fan speed going up and down (Intel Core i7 870)
Product: ACPI
Version: 2.5
Kernel Version: at least 4.0.4 and 4.0.5, probably all 4.*.*
Hardware: x86-64
OS: Linux
Tree: Fedora
Status: NEW
Severity: low
Priority: P1
Component: Power-Fan
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Overview
========
After installation of the first version 4.*.* kernel the fan speed of my CPU is
going up and down. It stays at ~400 RPM for about 10-15 seconds then peaks to
~3000 RPM for about one second then goes down again, and repeat that
indefinitely. That happens for no apparent reason, CPU is more or less idle.
CPU temperature seems to be stable at around 40° C.
Steps to Reproduce
==================
Install kernel 4.0.4-202.fc21.x86_64 on a Fedora 21 machine with an Intel Core
i7 870 processor. Or run a live DVD with Fedora 22. This bug occurs 100% of the
time.
Expected Results
================
Stable low fan speed.
Build / System
==============
Dist: Fedora 21
CPU: Intel Core i7 870
I tested with the following kernel builds, all showed the behavior described
above:
4.0.4-201.fc21.x86_64
4.0.4-202.fc21.x86_64
4.0.5-200.vanilla.stable.knurd.1.fc21.x86_64
The first two are from the official fedora repos, the third is from the
kernel-vanilla-stable repo (see
https://fedoraproject.org/wiki/Kernel_Vanilla_Repositories). So I suspect that
the fedora patches are not causing this bug.
Additional Information
======================
This bug was originally reported on the Fedora bugtracker
(https://bugzilla.redhat.com/show_bug.cgi?id=1225869), there are two other
people who have the same problem in the following configuration:
Fedora 22, kernel 4.0.4-301.fc22.x86_64, Intel Core i7 860
With the prior Fedora 21 kernels (3.19.7-200.fc21 and older) the fan behaved as
expected, stable and low speed.
Output of $ sensors
-------------------
i8k-virtual-0
Adapter: Virtual device
Processor Fan: 3269 RPM
Motherboard Fan: 807 RPM
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +44.0°C (high = +83.0°C, crit = +99.0°C)
Core 1: +44.0°C (high = +83.0°C, crit = +99.0°C)
Core 2: +46.0°C (high = +83.0°C, crit = +99.0°C)
Core 3: +47.0°C (high = +83.0°C, crit = +99.0°C)
it8720-isa-0a10
Adapter: ISA adapter
in0: +0.86 V (min = +0.00 V, max = +4.08 V) ALARM
in1: +3.04 V (min = +0.00 V, max = +4.08 V) ALARM
in2: +3.36 V (min = +0.00 V, max = +4.08 V) ALARM
+5V: +3.02 V (min = +0.00 V, max = +4.08 V) ALARM
in4: +3.02 V (min = +0.00 V, max = +4.08 V) ALARM
in5: +2.16 V (min = +0.00 V, max = +4.08 V) ALARM
in6: +2.16 V (min = +0.00 V, max = +4.08 V) ALARM
5VSB: +2.98 V (min = +0.00 V, max = +4.08 V) ALARM
Vbat: +2.99 V
fan1: 3245 RPM (min = 0 RPM)
fan2: 801 RPM (min = 0 RPM)
temp1: +127.0°C (low = -1.0°C, high = +127.0°C) ALARM sensor =
thermal diode
temp2: +22.0°C (low = -1.0°C, high = +127.0°C) ALARM sensor =
thermistor
temp3: -53.0°C (low = -1.0°C, high = +127.0°C) sensor = Intel PECI
cpu0_vid: +0.000 V
intrusion0: ALARM
-----------------------
an a second later
i8k-virtual-0
Adapter: Virtual device
Processor Fan: 445 RPM
Motherboard Fan: 818 RPM
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +41.0°C (high = +83.0°C, crit = +99.0°C)
Core 1: +44.0°C (high = +83.0°C, crit = +99.0°C)
Core 2: +46.0°C (high = +83.0°C, crit = +99.0°C)
Core 3: +44.0°C (high = +83.0°C, crit = +99.0°C)
it8720-isa-0a10
Adapter: ISA adapter
in0: +1.23 V (min = +0.00 V, max = +4.08 V)
in1: +3.04 V (min = +0.00 V, max = +4.08 V)
in2: +3.36 V (min = +0.00 V, max = +4.08 V)
+5V: +3.02 V (min = +0.00 V, max = +4.08 V)
in4: +3.02 V (min = +0.00 V, max = +4.08 V)
in5: +2.16 V (min = +0.00 V, max = +4.08 V)
in6: +2.16 V (min = +0.00 V, max = +4.08 V)
5VSB: +2.98 V (min = +0.00 V, max = +4.08 V)
Vbat: +2.99 V
fan1: 441 RPM (min = 0 RPM)
fan2: 812 RPM (min = 0 RPM)
temp1: +127.0°C (low = -1.0°C, high = +127.0°C) sensor = thermal
diode
temp2: +22.0°C (low = -1.0°C, high = +127.0°C) sensor = thermistor
temp3: -53.0°C (low = -1.0°C, high = +127.0°C) sensor = Intel PECI
cpu0_vid: +0.000 V
intrusion0: ALARM
Output of $ cat /proc/cpuinfo | grep "model name"
-------------------------------------------------
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
model name : Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
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