** Also affects: linux via http://bugzilla.kernel.org/show_bug.cgi?id=189291 Importance: Unknown Status: Unknown
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1598312 Title: Cannot scale AMD Turion CPU frequency. It runs on lowest 800MHz Status in Linux: Unknown Status in linux package in Ubuntu: Confirmed Status in linux-lts-xenial package in Ubuntu: Confirmed Bug description: 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) To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1598312/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
