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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