** Changed in: linux (Ubuntu Artful)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1743269
Title:
P-state not working in kernel 4.13
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Artful:
Fix Committed
Status in linux source package in Bionic:
Fix Committed
Bug description:
== SRU Justification ==
Commits b29c6ef7bb12 and 7d5905dc14a8 fix a regression in Artful. They
were both added to mainline in v4.15-rc1 and fix the following two commits:
b29c6ef7bb12 Fixes: 4815d3c56d1e (cpufreq: x86: Make scaling_cur_freq behave
more as expected)
7d5905dc14a8 Fixes: 890da9cf0983 (Revert "x86: do not use cpufreq_quick_get()
for /proc/cpuinfo "cpu MHz"")
According to the bug report, P-state is not working in Artful, but it was
working
in Zesty. This bug is happening on a Lenovo Thinkpad X230 with an Intel Core
i5-3210M CPU.
The bug reporter is using CPU scaling to improve battery life.
== Fixes ==
b29c6ef7bb12 ("x86 / CPU: Avoid unnecessary IPIs in arch_freq_get_on_cpu()")
7d5905dc14a8 ("x86 / CPU: Always show current CPU frequency in /proc/cpuinfo")
== Regression Potential ==
Low. The two commit fix a current regression and have had additiona upstream
reviews
from being send to stable.
## Original Bug Description ##
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
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