Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1738534
Title:
Processor turbo dsiabled/throttled after suspend
Status in linux package in Ubuntu:
Confirmed
Bug description:
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.
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