You have been subscribed to a public bug:
http://askubuntu.com/questions/789096/cant-scale-frequencies-of-amd-
turion-cpu-it-always-jumps-to-lowest
The CPU does not scale frequency on kernel "4.2.0-41-generic
#48~14.04.1-Ubuntu SMP Fri Jun 24 17:09:15". The notebook behaves very
slow despite on Windows Vista it works great.
Cpufreq-info program shows that there is a limit on the frequency setting
between 800MHz and 800MHz. I tried to impose the frequency by setting the
"performance policy" or by setting the limit in /etc/default/cpufrequency, but
it does not work.
Next I tried to check the BIOS limits, because there are some suggestions that
some battery/power supply problems could cause the BIOS to set the limits on
CPU freq but it is not there.
The CPU freq scaling works good on 'linux-image-4.1.26-040126-generic'
kernel. It does not work on this kernel "4.2.0-41-generic" and "linux-
headers-4.2.0-38-generic". The current workaround is to switch off the
ACPI by "acpi=off" boot parameter. Using this setting the CPU frequency
scaling works but it makes the system single CPU core only.
Hardware: HP Compaq 6715B notebook with AMD Turion CPU TL-58 and
powernow-k8 cpufreq driver. I've heard some posts that on others HP
notebooks there are similar problems with the freq scaling.
$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpuf...@vger.kernel.org, please.
analyzing CPU 0:
driver: powernow-k8
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0 1
maximum transition latency: 109 us.
hardware limits: 800 MHz - 1.90 GHz
available frequency steps: 1.90 GHz, 1.80 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 800 MHz and 800 MHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
cpufreq stats: 1.90 GHz:0,07%, 1.80 GHz:0,00%, 1.60 GHz:0,00%, 800 MHz:99,93%
(1)
analyzing CPU 1:
driver: powernow-k8
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0 1
maximum transition latency: 109 us.
hardware limits: 800 MHz - 1.90 GHz
available frequency steps: 1.90 GHz, 1.80 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 800 MHz and 800 MHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
cpufreq stats: 1.90 GHz:0,07%, 1.80 GHz:0,00%, 1.60 GHz:0,00%, 800 MHz:99,93%
(1)
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-41-generic 4.2.0-41.48~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-41.48~14.04.1-generic 4.2.8-ckt11
Uname: Linux 4.2.0-41-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Jul 1 23:49:34 2016
InstallationDate: Installed on 2016-04-08 (83 days ago)
InstallationMedia: Kubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64
(20160217.1)
SourcePackage: linux-lts-wily
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Affects: linux-lts-xenial (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug kernel-bug kernel-da-key patch trusty
--
Cannot scale AMD Turion CPU frequency. It runs on lowest 800MHz
https://bugs.launchpad.net/bugs/1598312
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