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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1769236
Title:
CPU frequency stuck at minimum value
Status in linux package in Ubuntu:
Incomplete
Bug description:
I installed the Kubuntu variant of Ubuntu 18.04 on a new HP Spectre 13
laptop. Performance is poor. The CPU (an i7-8550U) is running at
400MHz, and never speeds up, even when running some of the Phoronix
Test Suite benchmarks.
I can use cpupower to switch to the "performance" cpufreq governor,
but cannot change the frequency with either governor.
Here is the output of some experiments I ran while Phoronix's c-ray test was
running.
______________
gjditchf@copperplate:/var/log$ cat /proc/cpuinfo | grep MHz
cpu MHz : 400.008
cpu MHz : 400.002
cpu MHz : 400.002
cpu MHz : 400.003
cpu MHz : 400.005
cpu MHz : 400.003
cpu MHz : 400.001
cpu MHz : 400.004
gjditchf@copperplate:/var/log$ 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: 400 MHz - 4.00 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 400 MHz and 1.60 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 400 MHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes
gjditchf@copperplate:/var/log$ sudo cpupower frequency-set -f 1.60GHz
Setting cpu: 0
Error setting new values. Common errors:
- Do you have proper administration rights? (super-user?)
- Is the governor you requested available and modprobed?
- Trying to set an invalid policy?
- Trying to set a specific frequency, but userspace governor is not available,
for example because of hardware which cannot be set to a specific frequency
or because the userspace governor isn't loaded?
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-20-generic 4.15.0-20.21
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: KDE
Date: Fri May 4 12:57:25 2018
InstallationDate: Installed on 2018-04-28 (6 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64
(20180426)
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)
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