Comment 0 for bug 1743269

I have a Lenovo Thinkpad X230 with an Intel Core i5-3210M CPU. I'm using Xubuntu 17.10 (Description: Ubuntu 17.10, Release: 17.10). I use tlp 1.0-1~artful in order to improve battery performance, particularly enabling the Intel P-state performance scaling. In Xubuntu 17.04 it worked flawlessly, but when I upgraded to 17.10 the processor doesn't scale anymore. I ran all the updates and it's not working. I also did a clean install using another hard drive and the problem persist.

I searched the tlp forums and similar problems pointed to a kernel bug, so I'm filing this report.

I tested different mainline kernels in order to see what kernel version is causing the problem:

Up to mainline kernel 4.12.14 generic, P-state scaling is OK
Kernel 4.13 generic up to kernel 4.14.12 generic, P-state scaling is not working
Kernel 4.14.13 generic up to 4.15 rc7 generic, P-state scaling is OK

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-25-generic 4.13.0-25.29
ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
Uname: Linux 4.13.0-25-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: eduar 1686 F.... pulseaudio
CurrentDesktop: XFCE
Date: Sun Jan 14 18:46:27 2018
HibernationDevice: RESUME=UUID=ec172c41-ddb8-4d67-8249-390aa1bb6331
InstallationDate: Installed on 2017-02-07 (341 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: LENOVO 232032U
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-25-generic root=UUID=a5c459a3-f6c9-40cd-a648-e7b8b28a2ee6 ro radeon.dpm=1 quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-25-generic N/A
 linux-backports-modules-4.13.0-25-generic N/A
 linux-firmware 1.169.1
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2018-01-13 (1 days ago)
dmi.bios.date: 09/25/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ETB0WW (2.70 )
dmi.board.asset.tag: Not Available
dmi.board.name: 232032U
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG2ETB0WW(2.70):bd09/25/2017:svnLENOVO:pn232032U:pvrThinkPadX230:rvnLENOVO:rn232032U:rvrNODPK:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad X230
dmi.product.name: 232032U
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO