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[Bug 1421793] Re: intel_pstate is always reported to be set to 'performance'

 

*-cpu                   
       description: CPU
       product: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
       vendor: Intel Corp.
       physical id: 4
       bus info: cpu@0
       version: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
       serial: To Be Filled By O.E.M.
       slot: U3E1
       size: 3072MHz
       capacity: 3072MHz
       width: 64 bits
       clock: 100MHz
       capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cpufreq
       configuration: cores=4 enabledcores=4 threads=8

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https://bugs.launchpad.net/bugs/1421793

Title:
  intel_pstate is always reported to be set to 'performance'

Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  as in - 
  cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver 
  intel_pstate

  cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
  performance
  performance
  performance
  performance
  performance
  performance
  performance
  performance

  cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
  2400000
  2400187
  2400093
  2394468
  2397281
  2400000
  2400093
  2401125

  In 15.04 it is reported at performance at login, then switches to
  powersave after a min. or so

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified: boot/vmlinuz-3.16.0-30-generic]
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Feb 13 14:13:57 2015
  InstallationDate: Installed on 2015-02-08 (5 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150203.2)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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References