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[Launchpad Bug Tracker <1035050@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1035050

Title:
  Unable to set scaling frequency on cpu with Precise server

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I noticed this on a machine I won't have access to any longer after
  filing this :( but I'm fairly sure this is not specific to this
  machine.

  While testing, the cpu frequency scaling tests failed.  Looking a bit
  into what's going in, the problem is that the test is unable to set
  the scaling frequency in sysfs.   I did some digging and in some cases
  this is due to the governor being used at the time.  The userspace
  governor has to be A: supported by the kernel and B: in use before you
  can do anything with scaling_setfrequency.

  So here's what I see:

  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ cat scaling_governor 
  userspace
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ cat scaling_setspeed 
  1200000
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ cat scaling_cur_freq 
  1200000
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ cat scaling_driver 
  acpi-cpufreq
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ cat scaling_available_frequencies 
  2601000 2600000 2500000 2400000 2300000 2200000 2100000 2000000 1900000 1800000 1700000 1600000 1500000 1400000 1300000 1200000 
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ sudo echo 2600000 > scaling_setspeed 
  -bash: scaling_setspeed: Permission denied
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ sudo echo "2600000" > scaling_setspeed 
  -bash: scaling_setspeed: Permission denied
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ sudo echo "2600000" >> scaling_setspeed 
  -bash: scaling_setspeed: Permission denied
  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ sudo echo 2600000 >> scaling_setspeed 
  -bash: scaling_setspeed: Permission denied

  And in the kernel config:

  leo@ubuntu:/sys/devices/system/cpu/cpu0/cpufreq$ grep -i userspace /boot/config-3.2.0-23-generic 
  # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
  CONFIG_CPU_FREQ_GOV_USERSPACE=y
  # CONFIG_DM_LOG_USERSPACE is not set
  CONFIG_REGULATOR_USERSPACE_CONSUMER=m
  CONFIG_DEVFREQ_GOV_USERSPACE=y
  CONFIG_OCFS2_FS_USERSPACE_CLUSTER=m
  # CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER is not set

  So everything appears to be in place, but I just can't change the frequency...
  --- 
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 Aug  8 15:09 seq
   crw-rw---T 1 root audio 116, 33 Aug  8 15:09 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu5
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=e0b9d529-6f55-4fb6-b76d-d82b076ccc96
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
  IwConfig:
   lo        no wireless extensions.
   
   eth1      no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: Quanta S210-X12RS
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=c37eac21-f72f-44ad-b8e8-dd4945cc3582 ro
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-23-generic N/A
   linux-backports-modules-3.2.0-23-generic  N/A
   linux-firmware                            1.79
  RfKill: Error: [Errno 2] No such file or directory
  StagingDrivers: mei
  Tags:  precise staging
  Uname: Linux 3.2.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  WifiSyslog:
   
  dmi.bios.date: 07/05/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: S2RS3A15
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: S210-X12RS
  dmi.board.vendor: Quanta
  dmi.board.version: 31S2RMB0050
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Quanta
  dmi.chassis.version: To be filled by O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS2RS3A15:bd07/05/2012:svnQuanta:pnS210-X12RS:pvrTobefilledbyO.E.M.:rvnQuanta:rnS210-X12RS:rvr31S2RMB0050:cvnQuanta:ct17:cvrTobefilledbyO.E.M.:
  dmi.product.name: S210-X12RS
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Quanta

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