Tried switching to 3.19 kernel - still high speed. Tried switching to intel X driver instead of modesetting: CPU still runs at high speed.
The only changes I haven't backed out are: a) The Ubuntu 15.10 userland. b) The BIOS update from 1.07 to 1.10. With absolutely quiescent system, under modesetting driver, CPU will settle at 800MHz, but wiggling the mouse or outputting to an xterm causes the CPU speed to rise. Under intel driver, an apparently absolutely quiescent system seems to use more CPU than under modesetting. powertop is reporting power usage between 12 and 26 W, whereas previously with 15.04 I had power usage of 5-8W. Please help, this is killing me. No battery = no computer. -- 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/1535426 Title: CPU runs at high speed after upgrade Status in linux package in Ubuntu: Confirmed Bug description: After a dist-upgrade from 15.04 to 15.10, moving from kernel 3.19.0-43 to 4.2.0-23, my laptop CPU runs continuously at 3GHz, and never slows down to 800MHz, as it used to. This has reduced my battery life from 24 hours to 8 hours. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: linux-image-4.2.0-23-generic 4.2.0-23.28 ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6 Uname: Linux 4.2.0-23-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: shevek 2664 F.... pulseaudio /dev/snd/controlC0: shevek 2664 F.... pulseaudio CurrentDesktop: XFCE Date: Mon Jan 18 11:38:29 2016 HibernationDevice: RESUME=UUID=22fd2208-7557-432d-bbff-95dd97905323 InstallationDate: Installed on 2015-05-18 (244 days ago) InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1) MachineType: LENOVO 20CKCT01WW ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-23-generic.efi.signed root=/dev/mapper/xubuntu--vg-root ro noprompt persistent quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.2.0-23-generic N/A linux-backports-modules-4.2.0-23-generic N/A linux-firmware 1.149.3 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: Upgraded to wily on 2016-01-17 (1 days ago) dmi.bios.date: 08/20/2015 dmi.bios.vendor: LENOVO dmi.bios.version: N11ET34W (1.10 ) dmi.board.asset.tag: Not Available dmi.board.name: 20CKCT01WW dmi.board.vendor: LENOVO dmi.board.version: 0B98417 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN11ET34W(1.10):bd08/20/2015:svnLENOVO:pn20CKCT01WW:pvrThinkPadT550:rvnLENOVO:rn20CKCT01WW:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20CKCT01WW dmi.product.version: ThinkPad T550 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535426/+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
