Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.17 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc4 ** Package changed: linux-signed (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- 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/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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1769236/+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
