This change was made by a bot.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1815214
Title:
Lenovo T480: throttling CPU issue
Status in linux package in Ubuntu:
Confirmed
Bug description:
On Linux OS the CPU package power limit (PL1/2) is set wrong reducing
drastically CPU performance under load.
Apparently many Lenovo laptops (certified for Ubuntu) are affected.
The problem is described in details here:
https://www.reddit.com/r/thinkpad/comments/870u0a/t480s_linux_throttling_bug/
There is "hacky" workaround (not compatible with SecureBoot, a Python
script writing MSR registers periodically) :
https://github.com/erpalma/throttled
There is also a thread on Lenovo forum: https://forums.lenovo.com/t5
/Linux-Discussion/X1C6-T480s-low-cTDP-and-trip-temperature-in-
Linux/td-p/4028489
I confirm the issue affect my machine running the latest kernel
(4.15.0-45-generic, although bug affects previous releases as well)
and using the latest firmware from Lenovo (1.19).
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-45-generic 4.15.0-45.48
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: afiergol 4050 F.... pulseaudio
/dev/snd/pcmC0D0p: afiergol 4050 F...m pulseaudio
/dev/snd/controlC0: afiergol 4050 F.... pulseaudio
CurrentDesktop: GNOME
Date: Fri Feb 8 17:14:17 2019
HibernationDevice: RESUME=UUID=7b4a9d17-f6d7-42ed-8f12-34f46c41cc6c
InstallationDate: Installed on 2018-04-05 (309 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64
(20180228)
MachineType: LENOVO 20L6S04200
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-45-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash nogpumanager
intel_iommu=on,igfx_off iommu=pt kvm.ignore_msrs=1 vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-45-generic N/A
linux-backports-modules-4.15.0-45-generic N/A
linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-08-22 (170 days ago)
dmi.bios.date: 11/07/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N24ET44W (1.19 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20L6S04200
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN24ET44W(1.19):bd11/07/2018:svnLENOVO:pn20L6S04200:pvrThinkPadT480:rvnLENOVO:rn20L6S04200:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T480
dmi.product.name: 20L6S04200
dmi.product.version: ThinkPad T480
dmi.sys.vendor: LENOVO
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815214/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
