kernel-packages team mailing list archive

[Rocko <rockorequin@xxxxxxxxxxx>]

Public bug reported:

I notice that turbostat shows all cpus stuck at the minimum 800MHz (see
attached log) on my system, even after rebooting twice. I used "stress
--cpu 8" to confirm that the frequencies remained at 800MHz even under
load.

It looks like the system is using the acpi-cpufreq driver with the
ondemand governor (has the default been changed so it does not use intel
p-state, as per
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647?).

The only unusual thing I had done prior to this was to boot into the
weekly build of 3.12-rc3 just prior (this kernel kept the frequencies
rather high, typically over 2GHz, ie using a lot more power than usual,
so I rebooted back into the standard kernel).

This is the contents of the files in
/sys/devices/system/cpu/cpu0/cpufreq/:

affected_cpus:
0
bios_limit:
2001000
cpuinfo_cur_freq:
800000
cpuinfo_max_freq:
2001000
cpuinfo_min_freq:
800000
cpuinfo_transition_latency:
10000
freqdomain_cpus:
0 1 2 3 4 5 6 7
related_cpus:
0
scaling_available_frequencies:
2001000 2000000 1900000 1800000 1700000 1600000 1500000 1400000 1300000 1200000 1100000 1000000 900000 800000 
scaling_available_governors:
conservative ondemand userspace powersave performance 
scaling_cur_freq:
800000
scaling_driver:
acpi-cpufreq
scaling_governor:
ondemand
scaling_max_freq:
2001000
scaling_min_freq:
800000
scaling_setspeed:
<unsupported>
stats:

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-9-generic 3.11.0-9.16
ProcVersionSignature: Ubuntu 3.11.0-9.16-generic 3.11.2
Uname: Linux 3.11.0-9-generic x86_64
ApportVersion: 2.12.5-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  rocko      2813 F.... pulseaudio
Date: Tue Oct  1 10:13:24 2013
InstallationDate: Installed on 2012-08-25 (401 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120724.2)
MachineType: Dell Inc. Dell System XPS L502X
MarkForUpload: True
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-9-generic root=UUID=67083065-b92e-4596-a218-817c1dfc8ae7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-9-generic N/A
 linux-backports-modules-3.11.0-9-generic  N/A
 linux-firmware                            1.115
SourcePackage: linux
UpgradeStatus: Upgraded to saucy on 2013-09-01 (30 days ago)
dmi.bios.date: 05/29/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0NJT03
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L502X
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug saucy

** Attachment added: "log output from the turbostat command"
   https://bugs.launchpad.net/bugs/1233479/+attachment/3852207/+files/turbostat%20log

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https://bugs.launchpad.net/bugs/1233479

Title:
  CPUs stuck at minimum frequency with ondemand cpufreq governor, even
  after reboot

Status in “linux” package in Ubuntu:
  New

Bug description:
  I notice that turbostat shows all cpus stuck at the minimum 800MHz
  (see attached log) on my system, even after rebooting twice. I used
  "stress --cpu 8" to confirm that the frequencies remained at 800MHz
  even under load.

  It looks like the system is using the acpi-cpufreq driver with the
  ondemand governor (has the default been changed so it does not use
  intel p-state, as per
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647?).

  The only unusual thing I had done prior to this was to boot into the
  weekly build of 3.12-rc3 just prior (this kernel kept the frequencies
  rather high, typically over 2GHz, ie using a lot more power than
  usual, so I rebooted back into the standard kernel).

  This is the contents of the files in
  /sys/devices/system/cpu/cpu0/cpufreq/:

  affected_cpus:
  0
  bios_limit:
  2001000
  cpuinfo_cur_freq:
  800000
  cpuinfo_max_freq:
  2001000
  cpuinfo_min_freq:
  800000
  cpuinfo_transition_latency:
  10000
  freqdomain_cpus:
  0 1 2 3 4 5 6 7
  related_cpus:
  0
  scaling_available_frequencies:
  2001000 2000000 1900000 1800000 1700000 1600000 1500000 1400000 1300000 1200000 1100000 1000000 900000 800000 
  scaling_available_governors:
  conservative ondemand userspace powersave performance 
  scaling_cur_freq:
  800000
  scaling_driver:
  acpi-cpufreq
  scaling_governor:
  ondemand
  scaling_max_freq:
  2001000
  scaling_min_freq:
  800000
  scaling_setspeed:
  <unsupported>
  stats:

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-9-generic 3.11.0-9.16
  ProcVersionSignature: Ubuntu 3.11.0-9.16-generic 3.11.2
  Uname: Linux 3.11.0-9-generic x86_64
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  rocko      2813 F.... pulseaudio
  Date: Tue Oct  1 10:13:24 2013
  InstallationDate: Installed on 2012-08-25 (401 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120724.2)
  MachineType: Dell Inc. Dell System XPS L502X
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-9-generic root=UUID=67083065-b92e-4596-a218-817c1dfc8ae7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-9-generic N/A
   linux-backports-modules-3.11.0-9-generic  N/A
   linux-firmware                            1.115
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-09-01 (30 days ago)
  dmi.bios.date: 05/29/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0NJT03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.

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