From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 86461] New: intel_pstate does not obey min/max frequencies set
by user
Date: Fri, 17 Oct 2014 09:21:52 +0000
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To: cpufreq@vger.kernel.org
https://bugzilla.kernel.org/show_bug.cgi?id=86461
Bug ID: 86461
Summary: intel_pstate does not obey min/max frequencies set by
user
Product: Power Management
Version: 2.5
Kernel Version: 3.17-rc5
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
Assignee: cpufreq@vger.kernel.org
Reporter: patrakov@gmail.com
Regression: No
# uname -a
Linux aep-vaio 3.17.0-rc5 #1 SMP PREEMPT Thu Sep 18 23:13:08 YEKT 2014 x86_64
Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz GenuineIntel GNU/Linu
# echo 2400000 | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_min_freq
# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 2.40 GHz and 3.50 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 804 MHz (asserted by call to hardware).
analyzing CPU 1:
driver: intel_pstate
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 2.40 GHz and 3.50 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 885 MHz (asserted by call to hardware).
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 2.40 GHz and 3.50 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 800 MHz (asserted by call to hardware).
analyzing CPU 3:
driver: intel_pstate
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 0.97 ms.
hardware limits: 800 MHz - 3.50 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 2.40 GHz and 3.50 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 822 MHz (asserted by call to hardware).
As you see, my attempt to force the minimum frequency to 2.4 GHz has been
ignored.
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