Ubuntu
linux package

cpufreq_ondemand scales in steps

Bug #681016 reported by tsg1zzn on 2010-11-24

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	linux (Ubuntu)	Expired	Low	Unassigned

Bug Description

Ondemand cpu scaling policy is supposed to run at minimum speed and increase immediately to maximum speed when there is cpu load. However, CPU Frequency Scaling Monitor 2.30.0 (gnome applet) shows that sometimes speeds in between minimum and maximum are used, even when ondemand is selected.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.33
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
   Subdevices: 0/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC268 Analog [ALC268 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: trond 1596 F.... pulseaudio
/dev/snd/pcmC0D0p: trond 1596 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf8300000 irq 46'
   Mixer name : 'Realtek ALC268'
   Components : 'HDA:10ec0268,10280275,00100003'
   Controls : 12
   Simple ctrls : 7
Date: Wed Nov 24 17:01:34 2010
HibernationDevice: RESUME=/dev/sda7
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928)
MachineType: Dell Inc. Vostro1710
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=d38e9c68-1752-4dd8-92d0-59d48e3946a0 ro quiet splash
ProcEnviron:
LANGUAGE=en
PATH=(custom, user)
LANG=en_GB.utf8
SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
0: dell-wifi: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
dmi.bios.date: 10/09/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.name: 0X805C
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnDellInc.:bvrA10:bd10/09/2008:svnDellInc.:pnVostro1710:pvrNull:rvnDellInc.:rn0X805C:rvr:cvnDellInc.:ct8:cvrN/A:
dmi.product.name: Vostro1710
dmi.product.version: Null
dmi.sys.vendor: Dell Inc.

See original description

Tags:

Revision history for this message

tsg1zzn (tsg1zzn) wrote on 2010-11-24:

AcpiTables.txt Edit (169.9 KiB, text/plain; charset="utf-8")
AlsaDevices.txt Edit (403 bytes, text/plain; charset="utf-8")
BootDmesg.txt Edit (58.8 KiB, text/plain; charset="utf-8")
Card0.Amixer.values.txt Edit (1.6 KiB, text/plain; charset="utf-8")
Card0.Codecs.codec.0.txt Edit (8.2 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (1.0 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (1.8 KiB, text/plain; charset="utf-8")
IwConfig.txt Edit (245 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (15.7 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (634 bytes, text/plain; charset="utf-8")
PciMultimedia.txt Edit (586 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (1.5 KiB, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.6 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (2.7 KiB, text/plain; charset="utf-8")
UdevDb.txt Edit (136.2 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (272.0 KiB, text/plain; charset="utf-8")
WifiSyslog.txt Edit (1.8 KiB, text/plain; charset="utf-8")

tsg1zzn (tsg1zzn) on 2010-11-24

description:

updated

Revision history for this message

Jeremy Foshee (jeremyfoshee) wrote on 2010-12-01:

Hi tsg1zzn,

If you could also please test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

tags:	added: kj-triage
Changed in linux (Ubuntu):
status:	New → Incomplete

Revision history for this message

tsg1zzn (tsg1zzn) wrote on 2010-12-02:

Screenshot-1.png Edit (4.4 KiB, image/png)

I installed a new kernel from here: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.37-rc2-maverick/

For some reason the default mode was performance, not ondemand. So I set both cores to ondemand, and it still occassionally scales in steps.

tags:	removed: needs-upstream-testing
Changed in linux (Ubuntu):
status:	Incomplete → New

Brad Figg (brad-figg) on 2010-12-04

tags:

added: acpi-apic

Revision history for this message

tsg1zzn (tsg1zzn) wrote on 2010-12-10:

After installing the new kernel, the governor type isn't saved when rebooting (it always defaults to performance). How do I make it stick to ondemand?

Brad Figg (brad-figg) on 2011-05-04

Changed in linux (Ubuntu):
status:	New → Confirmed

Revision history for this message

penalvch (penalvch) wrote on 2012-07-27:

tsg1zzn, thank you for reporting this and helping make Ubuntu better. Maverick reached EOL on April 10, 2012.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We were wondering if this is still an issue in a supported release? If so, can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command in a supported release from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please do not test the kernel in the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. As well, please comment on which kernel version specifically you tested.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream', and comment as to why specifically you were unable to test it.

Please let us know your results. Thanks in advance.

Helpful Bug Reporting Links:
https://help.ubuntu.com/community/ReportingBugs#Bug_Reporting_Etiquette
https://help.ubuntu.com/community/ReportingBugs#A3._Make_sure_the_bug_hasn.27t_already_been_reported
https://help.ubuntu.com/community/ReportingBugs#Adding_Apport_Debug_Information_to_an_Existing_Launchpad_Bug
https://help.ubuntu.com/community/ReportingBugs#Adding_Additional_Attachments_to_an_Existing_Launchpad_Bug

apport-collect -p linux <replace-with-bug-number>

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream', and comment as to why specifically you were unable to test it.

Please let us know your results. Thanks in advance.

tags:	added: needs-upstream-testing
Changed in linux (Ubuntu):
importance:	Undecided → Low
status:	Confirmed → Incomplete

Revision history for this message

Launchpad Janitor (janitor) wrote on 2012-09-25:

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

Changed in linux (Ubuntu):
status:	Incomplete → Expired

Report a bug

This report contains Public information

Everyone can see this information.

You are

Subscribing...

Edit bug mail

Other bug subscribers

Bug attachments

Add attachment

Remote bug watches

Bug watches keep track of this bug in other bug trackers.

Ubuntulinux package

cpufreq_ondemand scales in steps

Bug Description

Other bug subscribers

Bug attachments

Remote bug watches

Ubuntu
linux package