Public bug reported:
After suspending/resuming my laptop on battery power, I noticed choppy
video playback. I've narrowed it down to the CPU being locked to lower
frequencies after suspend/resume (only on battery). Plugging the laptop
back in does not restore the normal performance, nor does suspend/resume
after plugging it back in. The performance doesn't drop until after the
suspend/resume, I'm not sure if it is _supposed_ to throttle when on
battery, but either way the behaviour is wrong.
Doing a full shutdown and restart restores the performance to normal.
Prior to a suspend/resume cycle, cpupower reports:
$ sudo cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
hardware limits: 800 MHz - 3.00 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 800 MHz and 3.00 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 1.26 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes
2800 MHz max turbo 4 active cores
2800 MHz max turbo 3 active cores
2800 MHz max turbo 2 active cores
3000 MHz max turbo 1 active cores
Afterwards, the frequency is clamped (cpufreq-set -r --max=3.0GHz has no
effect) and turbo is disabled:
$ sudo cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
hardware limits: 800 MHz - 3.00 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 800 MHz and 1.80 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 950 MHz (asserted by call to kernel)
boost state support:
Supported: no
Active: no
2800 MHz max turbo 4 active cores
2800 MHz max turbo 3 active cores
2800 MHz max turbo 2 active cores
3000 MHz max turbo 1 active cores
Trying to re-enable turbo mode by setting the no_turbo intel_pstate
/sys/ entry back to 0 is rejected:
$ echo 0 | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo
0
tee: /sys/devices/system/cpu/intel_pstate/no_turbo: Operation not permitted
However, these two commands *do* work around the problem, forcing turbo
mode back on and then restoring the normal frequency range:
sudo x86_energy_perf_policy --turbo-enable 1
sudo cpufreq-set -r --min=0.8GHz --max=3.0GHz
I also see this error in dmesg after some resumes (but the above problem
sometimes happens without this error message):
Dec 16 11:36:25 shauns-laptop kernel: intel_pstate: Turbo disabled by
BIOS or unavailable on processor
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-19-generic 4.13.0-19.22
ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
Uname: Linux 4.13.0-19-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: shaun 1194 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sat Dec 16 11:18:12 2017
InstallationDate: Installed on 2017-12-14 (1 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
Lsusb:
Bus 001 Device 004: ID 2232:1024 Silicon Motion
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: SAMSUNG ELECTRONICS CO., LTD. 900X3C/900X3D/900X4C/900X4D
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.13.0-19-generic
root=UUID=7352de8c-0017-44e1-81fb-0145ad9c1185 ro rootflags=subvol=@ quiet
splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.13.0-19-generic N/A
linux-backports-modules-4.13.0-19-generic N/A
linux-firmware 1.169.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/12/2012
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P03AAC
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvrP03AAC:bd07/12/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn900X3C/900X3D/900X4C/900X4D:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.family: ChiefRiver System
dmi.product.name: 900X3C/900X3D/900X4C/900X4D
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug artful wayland-session
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1738534
Title:
Processor turbo dsiabled/throttled after suspend
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1738534/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
