[Bug 1855178] [NEW] pstate

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Rik Mills (rikmills):

LSB Release: Ubuntu 19.10
Package: linux-image-5.3.0-23-generic
Hardware:  System76 Galago Pro v4 (i7-8750H), Clevo-960rd (i7-9750H)

Expected results:
CPU should be governed by Intel P-State and should normally idle between 400 and 800 MHz when not loaded.

Actual results:
After update, CPU frequency remains pegged at maximum at all times.  This sucks battery life and overheats the laptop.

Steps to reproduce:
1. Install Ubuntu 19.10 from official media. Kernel installed will be 5.3.0-18-generic
2. Check CPU frequencies. They will typically idle around 800MHz.  Loading the system will spike to max frequencies (4.5 for 9750H, 4.2 for 8750H).
3. Upgrade system. Kernel will update to 5.3.0-23-generic
4. Reboot.
5. Monitor CPU frequencies again. This time, all core will remain at max frequencies.

Additional information:

1. Geekbench v4 multi-core scores are cut in half (26K vs 13K) after update. Single-core scores drop around 20%.  This does not occur in 19.04 or 18.04. Confirmed on multiple 960rd systems.
2. linux-image-5.3.0-19-generic is also confirmed
3. We suspect that all kernels images after 5.3.0-18 have this bug
4. We are not sure how much hardware is affected. At present, only the 8750/9750H CPUs are confirmed.
--- 
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  kubuntu    2017 F.... pulseaudio
 /dev/snd/controlC1:  kubuntu    2017 F.... pulseaudio
CurrentDesktop: KDE
DistroRelease: Ubuntu 19.10
InstallationDate: Installed on 2019-11-18 (16 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Notebook P95_96_97Ex,Rx
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-23-generic root=/dev/mapper/vgkubuntu-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-23-generic N/A
 linux-backports-modules-5.3.0-23-generic  N/A
 linux-firmware                            1.183.2
Tags:  eoan
Uname: Linux 5.3.0-23-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 10/01/2019
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.07.13NS1
dmi.board.asset.tag: Tag 12345
dmi.board.name: P95_96_97Ex,Rx
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnINSYDECorp.:bvr1.07.13NS1:bd10/01/2019:svnNotebook:pnP95_96_97Ex,Rx:pvrNotApplicable:rvnNotebook:rnP95_96_97Ex,Rx:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: P95_96_97Ex,Rx
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook
--- 
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  kubuntu    1949 F.... pulseaudio
 /dev/snd/controlC1:  kubuntu    1949 F.... pulseaudio
CurrentDesktop: KDE
DistroRelease: Ubuntu 19.10
InstallationDate: Installed on 2019-11-18 (16 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Notebook P95_96_97Ex,Rx
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-24-generic root=/dev/mapper/vgkubuntu-root ro quiet splash
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-24-generic N/A
 linux-backports-modules-5.3.0-24-generic  N/A
 linux-firmware                            1.183.2
Tags:  eoan
Uname: Linux 5.3.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 10/01/2019
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.07.13NS1
dmi.board.asset.tag: Tag 12345
dmi.board.name: P95_96_97Ex,Rx
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnINSYDECorp.:bvr1.07.13NS1:bd10/01/2019:svnNotebook:pnP95_96_97Ex,Rx:pvrNotApplicable:rvnNotebook:rnP95_96_97Ex,Rx:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: P95_96_97Ex,Rx
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected eoan
-- 
pstate
https://bugs.launchpad.net/bugs/1855178
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