Hi William, How is your GPU temperature when this happens? Btw, as a more permanent temporary fix than rmmod you can blacklist it by creating the file /etc/modprobe.d/blacklist-intel_powerclamp.conf and adding the line "blacklist intel_powerclamp" to it.
As for my problem, I think it's a bit counter-intuitive that powerclamp starts to inject idle time when it's the *GPU* that is hot and using 50% of the CPU for this idle stuff almost right away is certainly excessive. It also takes a really long time after the temp has gone down for powerclamp to stop and during this time the system is very sluggish. I have to say, it seems this is not working as it should. -- 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/1389077 Title: [HP ProBook 4530s] Intel Powerclamp is Slowing CPU Status in “linux” package in Ubuntu: Incomplete Bug description: I upgraded from KUbuntu 14.04 to 14.10. Immediately, while playing minecraft with my daughter, I noticed the game was running very slowly. Even after closing the game, my web browsing slowed to a crawl. Looking at the processes in top, I noticed there were 4 tasks called kidle_inject running at 50% CPU each. After spending a long time figuring out what caused this, I found out this is caused by the Intel Powerclamp driver. I never did anything to enable this, and haven't observed this slowdown before the upgrade. I found the powerclamp driver in the /sys/class/thermal/cooling_device5 directory: root@bkat-HP-ProBook-4530s:/sys/class/thermal/cooling_device5# cat type intel_powerclamp root@bkat-HP-ProBook-4530s:/sys/class/thermal/cooling_device5# cat cur_state -1 root@bkat-HP-ProBook-4530s:/sys/class/thermal/cooling_device5# cat max_state 50 I tried to echo 0 to cur_state, but it still reported -1 when I catted the value. There seems to be no obvious way to disable this, and this should not have been enabled in the first place. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-24-generic 3.16.0-24.32 ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4 Uname: Linux 3.16.0-24-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bkat 2780 F.... pulseaudio CurrentDesktop: KDE Date: Mon Nov 3 23:16:04 2014 HibernationDevice: RESUME=UUID=35e1d874-a3bd-4227-acab-16f3e929d993 InstallationDate: Installed on 2012-04-22 (925 days ago) InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) MachineType: Hewlett-Packard HP ProBook 4530s ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=743f1686-bfe7-4e32-911d-5371633ccec8 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-24-generic N/A linux-backports-modules-3.16.0-24-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: Upgraded to utopic on 2014-11-03 (0 days ago) dmi.bios.date: 05/13/2011 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68SRR Ver. F.09 dmi.board.name: 167C dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 22.1A dmi.chassis.asset.tag: CNU1284V1X dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68SRRVer.F.09:bd05/13/2011:svnHewlett-Packard:pnHPProBook4530s:pvrA0001D02:rvnHewlett-Packard:rn167C:rvrKBCVersion22.1A:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP ProBook 4530s dmi.product.version: A0001D02 dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1389077/+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
