kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Tags added: latest-bios-2jkt49aus

** Tags added: needs-upstream-testing

** Tags added: regression-potential

** Tags removed: regression-potential
** Tags added: regression-release

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https://bugs.launchpad.net/bugs/962947

Title:
  CPU scaled back to very slow speed, cannot increase speed

Status in The Linux Kernel:
  Incomplete
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  It appears that my 1.86GHz  Intel Core2 CPU is only running at 700Mhz.
  The attached files show (in /proc/cpu) that the cpu is actually a
  1.86Ghz, but cpufreq only lets me set a maximum of 700mhz. I am
  running precise amd64 on a 3.2.0-20-generic kernel, though the same
  was seen linux-image-3.2.0-19-generic as well I believe.

  The system is a Lenovo ThinkCentre 8810-91G, and the bios is the
  latest one available. The bios doesn't show any cpu limiting options
  or restrictions, and shows the cpus as the expected 1.86Mhz (though I
  think that is just model information rather than the current clock
  speed). I cannot see any overclocking options in the bios.

  $cpufreq-info 
  cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
  Report errors and bugs to cpufreq@xxxxxxxxxxxxxxx, please.
  analyzing CPU 0:
    driver: acpi-cpufreq
    CPUs which run at the same hardware frequency: 0 1
    CPUs which need to have their frequency coordinated by software: 0
    maximum transition latency: 10.0 us.
    hardware limits: 600 MHz - 700 MHz
    available frequency steps: 700 MHz, 600 MHz
    available cpufreq governors: conservative, ondemand, userspace, powersave, performance
    current policy: frequency should be within 600 MHz and 700 MHz.
                    The governor "ondemand" may decide which speed to use
                    within this range.
    current CPU frequency is 600 MHz.
    cpufreq stats: 700 MHz:69.61%, 600 MHz:30.39%  (3179)
  analyzing CPU 1:
    driver: acpi-cpufreq
    CPUs which run at the same hardware frequency: 0 1
    CPUs which need to have their frequency coordinated by software: 1
    maximum transition latency: 10.0 us.
    hardware limits: 600 MHz - 700 MHz
    available frequency steps: 700 MHz, 600 MHz
    available cpufreq governors: conservative, ondemand, userspace, powersave, performance
    current policy: frequency should be within 600 MHz and 700 MHz.
                    The governor "ondemand" may decide which speed to use
                    within this range.
    current CPU frequency is 700 MHz.
    cpufreq stats: 700 MHz:59.66%, 600 MHz:40.34%  (4168)

  ACPI appears to be reporting a bios limit on the CPU, though I have no
  idea why.

  $for i in /sys/devices/system/cpu/cpu0/cpufreq/*; do echo $i; sudo cat $i ; done
  /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus
  0
  /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
  700000
  /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
  700000
  /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
  700000
  /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
  600000
  /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency
  10000
  /sys/devices/system/cpu/cpu0/cpufreq/related_cpus
  0 1
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
  700000 600000 
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
  conservative ondemand userspace powersave performance 
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
  700000
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
  acpi-cpufreq
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
  ondemand
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
  700000
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
  600000
  /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
  <unsupported>

  I can't recall if this was an issue on oneiric or not as I never
  looked at the cpufreq before. It may or may not be a new issue.

  I'm not entirely sure if this is a kernel bug or something else (like
  ACPI), but am happy to try various other kernels to see if they help.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-20-generic 3.2.0-20.32
  ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  anton      4977 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Fri Mar 23 09:59:01 2012
  HibernationDevice: RESUME=/dev/mapper/vg0-swap
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100701)
  MachineType: LENOVO 881091G
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-20-generic root=/dev/mapper/vg0-ubuntu ro quiet splash vt.handoff=7
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/12/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 2JKT49AUS
  dmi.board.name: LENOVO
  dmi.board.vendor: LENOVO
  dmi.board.version: NONE
  dmi.chassis.asset.tag: �������������������������
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: NONE
  dmi.modalias: dmi:bvnLENOVO:bvr2JKT49AUS:bd12/12/2008:svnLENOVO:pn881091G:pvrThinkCentreM55:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct3:cvrNONE:
  dmi.product.name: 881091G
  dmi.product.version: ThinkCentre M55
  dmi.sys.vendor: LENOVO

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