Comment 22 for bug 1188647

I think we need to know if intel_pstate is more stable in 4.x series,
because the new releases. If it keeps unstable may be disable by
default is the better choice.

2015-08-27 14:33 GMT-03:00 Colin Ian King <email address hidden>:
> Enabling intel-pstate on the 3.13 kernel was deemed problematic for
> several reasons. However, I have backported all of the changes upto
> 4.2-rc8 to 3.13 and re-enabled the intel-pstate driver for testing. I
> have performed a boot smoke test with this kernel and I think it needs
> some deeper testing to see if it resolves your issues.
>
> The kernel packages can be found in:
>
> http://kernel.ubuntu.com/~cking/intel-pstate
>
> Please can you see if these help.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1188647
>
> Title:
> Please change intel_pstate default to disable
>
> Status in linux package in Ubuntu:
> Fix Released
>
> Bug description:
> 3.9 introduced a new default governor on SandyBridge CPUs called
> INTEL_PSTATE which, when built in and enabled (the default), removes
> all other governors (like our usual default, ondemand). 3.10 extended
> this to Ivybridge generation CPUs.
>
> In theory, this isn't an awful thing, as the new Intel pstate governor
> should be higher performance and give better power savings. In
> theory.
>
> In practice, it drives my CPUs to max frequency nearly constantly,
> spins my fans like mad and, somehow, does all of this while also
> eating enough CPU time in kernel threads to make my machine choppy,
> unresponsive, and unable to do simple things like play videos when I
> get off work.
>
> Therefore, I propose that we, for now, toggle intel_pstate to disable
> by default (I am using intel_pstate=disable on my command line right
> now, with great success), so it's still built in, and people can play
> with it, but it's off by default.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 13.10
> Package: linux-image-3.9.0-4-generic 3.9.0-4.9
> ProcVersionSignature: Ubuntu 3.9.0-4.9-generic 3.9.4
> Uname: Linux 3.9.0-4-generic x86_64
> ApportVersion: 2.10.2-0ubuntu1
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: adconrad 2574 F.... pulseaudio
> CurrentDmesg:
> [ 30.633035] init: plymouth-stop pre-start process (2079) terminated with status 1
> [ 36.086916] br0: port 1(eth0) entered forwarding state
> Date: Fri Jun 7 08:48:56 2013
> HibernationDevice: RESUME=UUID=73040efa-baec-458a-8307-3bca07b26c3c
> InstallationDate: Installed on 2012-12-09 (179 days ago)
> InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20121209)
> MachineType: LENOVO 4173LPB
> MarkForUpload: True
> ProcFB: 0 inteldrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-4-generic root=UUID=2222aad5-ef31-4428-973f-71740fc7cb6a ro intel_pstate=disable quiet splash vt.handoff=7
> RelatedPackageVersions:
> linux-restricted-modules-3.9.0-4-generic N/A
> linux-backports-modules-3.9.0-4-generic N/A
> linux-firmware 1.109
> SourcePackage: linux
> UpgradeStatus: No upgrade log present (probably fresh install)
> dmi.bios.date: 09/13/2012
> dmi.bios.vendor: LENOVO
> dmi.bios.version: 8CET55WW (1.35 )
> dmi.board.asset.tag: Not Available
> dmi.board.name: 4173LPB
> dmi.board.vendor: LENOVO
> dmi.board.version: Not Available
> dmi.chassis.asset.tag: No Asset Information
> dmi.chassis.type: 10
> dmi.chassis.vendor: LENOVO
> dmi.chassis.version: Not Available
> dmi.modalias: dmi:bvnLENOVO:bvr8CET55WW(1.35):bd09/13/2012:svnLENOVO:pn4173LPB:pvrThinkPadT420s:rvnLENOVO:rn4173LPB:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
> dmi.product.name: 4173LPB
> dmi.product.version: ThinkPad T420s
> dmi.sys.vendor: LENOVO
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1188647/+subscriptions

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