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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