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

Jeff Lane, I've also noticed that one may not adjust things echo'ing to
/sys/* as either a standard user, or via sudo, requiring sudo su, so
this would not be limited to just setting the cpu frequency. Using sudo
su is my expectation as this is what accomplishes these types of brute
force changes. However, I would defer what the proper expectation is to
the Ubuntu Kernel Team.

Despite this, as a potential WORKAROUND, would you be able to set the
desired cpu frequency via cpufreq-selector (provided by the gnome-
applets package)?

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

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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:
  Incomplete

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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