Description of problem: The module powernow_k8 is not loaded automatically. This means that the CPU runs at it's max speed all the time. Which isn't a good thing in a hardware menant to be used in laptops. It has a huge impact on the battery life. How reproducible: Easiest way is to install powertop and in the frequency stats tab you can see clearly that the CPU only has a single mode. Steps to Reproduce: 1.Just run powertop to verify available modes for the cpu 2.Load manually #modprobe powernow_k8 3.Run again powertop to see that now it supports several frequencies. Additional details: Although having the module loaded the CPU runs always at it's max speed because the cpufreq governor is set by default to "performance", on a laptop it should be set to "ondemand"
Component: Installer => RPM PackagesAssignee: bugsquad => tmbSource RPM: (none) => kernel
I just read somewhere that powernow_k8 has been deprecated in kernel since kernel 3.7. It has been replaced by acpi_cpufreqd. Please post the output of "cpupower frequency-info".
CC: (none) => philippe.l
sorry that would be acpi_cpufreq without the "d".
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Status: NEW => RESOLVEDResolution: (none) => OLD
Seems this issue still persists or came back. With acpi-cpufreq, and the default governor being set to ondemand, affected CPU is Phenom II 720 and it seems to have worked OK with mga3 and mga4. Check https://forums.mageia.org/en/viewtopic.php?f=7&t=9801 FWIW, the wiki article about cpupower that mentions powernow_k8 to be deprecated in favour of acpi-cpufreq is this one: https://wiki.archlinux.org/index.php/CPU_frequency_scaling#CPU_frequency_driver I wonder why we still have it as kernel module if it's deprecated? Anyways, the CPU is running at full speed by default due to the performance governor, and that's a bad thing and a regression compared to mga4.
Status: RESOLVED => REOPENEDCC: (none) => doktor5000Version: 2 => CauldronResolution: OLD => (none)
Whiteboard: (none) => MGA5TOO
Summary: Powersaving module "powernow_k8" not loaded automatically on AMD E2 (brazos) => AMD cpu running at full speed with default 'performance' cpufreq governor
(In reply to Florian Hubold from comment #5) > Anyways, the CPU is running at full speed by default due to the performance > governor, and that's a bad thing and a regression compared to mga4. According to bug 13368 and bug 14584 this is expected and required for Intel CPU's, as those do only support performance or powersave, and cpufreq service will fail if something else is set. Hence performance is the default. So we need an Errata entry for the default cpufreq governor being "performance" and AMD CPU users might need to switch that actively to "ondemand". In effect similar to https://wiki.mageia.org/en/Mageia_2_Errata#Powersaving_features_not_enabled_by_default_on_AMD_E2_.28brazos.29_CPU.27s but slightly different wording. Added https://wiki.mageia.org/en/Mageia_5_Errata#default_cpufreq_governor_is_performance.2C_some_.5BAMD.5D_users_might_need_to_switch_to_ondemand *** This bug has been marked as a duplicate of bug 14584 ***
Status: REOPENED => RESOLVEDResolution: (none) => DUPLICATEWhiteboard: MGA5TOO => INERRATA