With this notebook, I am using Xubuntu 16.04 since I bought it. Since the start battery lasted less time than on Windows 10, but I didn't know why this was happening. The kernel at December 2016 was way more problematic, but nearly all the problems were solved, but this one, which reduces battery time, is still present.
I have tested the upstream kernel, and there are improvements: the package is reaching C3. While it is only one stage above, this single stage means 0,4 W of less consumption. When speaking about a system that uses 7 W, this 0,4 W means more than 5% of economy. It is still not perfect, as http://www.intel.com/content/www/us/en/processors/core/6th-gen-core- family-mobile-u-y-processor-lines-datasheet-vol-1.html states, package can reach C10, so there is still something to do. However, when installing the upstream kernel, there were warning messages: update-initramfs: Generating /boot/initrd.img-4.11.0-041100rc8-generic W: Possible missing firmware /lib/firmware/i915/kbl_dmc_ver1_01.bin for module i915 W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module i915 W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module i915 W: Possible missing firmware /lib/firmware/i915/kbl_huc_ver02_00_1810.bin for module i915 W: Possible missing firmware /lib/firmware/i915/bxt_huc_ver01_07_1398.bin for module i915 W: Possible missing firmware /lib/firmware/i915/skl_huc_ver01_07_1398.bin for module i915 I don't mind with bxt* and kbl*, as they are other generations processors, but there is one Skylake message, so I believe different problems can happen, and as they are related i915, I suppose it's graphics. So, while there is a improvement, it is still saving energy as it could, so I believe the bug still exists. ** Attachment added: "turbostat411rc8" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1686448/+attachment/4868333/+files/turbostat411rc8 -- 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/1686448 Title: Unable to reach higher than package C2 state with Skylake processor Status in linux package in Ubuntu: Incomplete Bug description: Hello I have a Lenovo Ideapad 310 with a Intel Core i3-6100U. I have noticed its battery last less time on Xubuntu 16.04 than on Windows 10. I have searched on internet what could cause it, and found with powertop it can't reach states higher than package C state 2, while it could reach package C state 10. On this particular notebook model, I would expect the battery would last a bit more than 5 hours using only browser, as it happens with Windows 10 and CentOS 7. On Xubuntu, battery lasts slightly more than 4 hours. The best was 4h30min, so I am having at least 30 minutes less battery time, but generally it is one hour. I have tried to get support on Ubuntu Forums, here is the link of the thread: https://ubuntuforums.org/showthread.php?t=2357271 As everything we tried had no success, I am making this report. As a reference, CentOS 7 functioned correctly and the battery lasted the same time than Windows 10, while Fedora 25 has this problem too. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-generic 4.4.0.75.81 ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59 Uname: Linux 4.4.0-75-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: usuario 4786 F.... pulseaudio CurrentDesktop: XFCE Date: Wed Apr 26 12:39:30 2017 HibernationDevice: RESUME=UUID=9f36068f-c6d6-4fd6-87d5-46f1f5247563 InstallationDate: Installed on 2016-12-31 (116 days ago) InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) MachineType: LENOVO 80UG ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-75-generic.efi.signed root=UUID=0fbb0f28-6764-4447-a890-dc966d1f8adf ro quiet RelatedPackageVersions: linux-restricted-modules-4.4.0-75-generic N/A linux-backports-modules-4.4.0-75-generic N/A linux-firmware 1.157.8 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/10/2017 dmi.bios.vendor: LENOVO dmi.bios.version: 0XCN39WW dmi.board.asset.tag: NO Asset Tag dmi.board.name: Toronto 4A2 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40679 WIN dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo ideapad 310-14ISK dmi.modalias: dmi:bvnLENOVO:bvr0XCN39WW:bd01/10/2017:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK: dmi.product.name: 80UG dmi.product.version: Lenovo ideapad 310-14ISK dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1686448/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
