Gioele Barabucci, thank you for reporting this and helping make Ubuntu better.
1a) Regarding regression potential, did you personally test with your Samsung NP900X3D-A03IT (not someone else, somewhere else) a prior Ubuntu release or prior kernel version and this was working? 1b) If so, which one specifically? 2) In order to allow additional upstream mainline kernel developers to examine the issue, at your earliest convenience, could you please test the latest mainline kernel? Please keep in mind the following: 1) The one to test is in a folder at the very top of the page (not the daily folder). 2) The release names are irrelevant. 3) The folder time stamps aren't indicative of when the kernel actually was released upstream. 4) Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds . If testing on your main install would be inconvenient, one may: 1) Install Ubuntu to a different partition and then test this there. 2) Backup, or clone the primary install. If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the mainline kernel, please comment on which kernel version specifically you tested. If this issue is not reproducible in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the Bug Description: kernel-fixed-upstream kernel-fixed-upstream-X.Y-rcZ Where X, and Y are the first two numbers of the kernel version, and Z is the release candidate number if it exists. If the issue is reproducible with the mainline kernel, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-X.Y-rcZ Please note, an error to install the kernel does not fit the criteria of kernel-bug-exists-upstream. Also, you don't need to apport-collect further unless specifically requested to do so. In addition, to keep this issue relevant to upstream, please continue to test the latest mainline kernel as it becomes available. Lastly, it is most helpful that after testing of the latest mainline kernel is complete, you mark this report Status Confirmed. Thank you for your help. ** Tags added: regression-potential ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1792672 Title: Regression: acpi reports battery state incorrectly after sleep Status in linux package in Ubuntu: Incomplete Bug description: On Samsung Series 9 laptops the battery state and the charger status are incorrectly reported in kernel 4.15. This bug is a regression: it has been fixed in 2012 [1] it used to work fine until Linux 14.10 (included). Quoting Matthew McCallum from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971061/comments/161 > If I disconnect power, remove the back cover, disconnect both the main battery and the backup battery, I am able to get power status updates (e.g. battery will show as charging/charged when plugged in, or just regular battery when not). Once I sleep, I have to repeat this process if I want the battery status to work again. > > `acpi -p` correctly shows the charging state, but `tlp-stat -b` does not. [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971061/comments/159 --- ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gioele 1939 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 16.04 HibernationDevice: RESUME=UUID=7e63a512-9a2c-4503-9bd9-ec2f74a7f029 InstallationDate: Installed on 2017-06-24 (447 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) MachineType: SAMSUNG ELECTRONICS CO., LTD. 900X3C/900X3D/900X3E/900X4C/900X4D Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic root=UUID=696c5d50-d388-4d33-b14a-babf7a7359df ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-33-generic N/A linux-backports-modules-4.15.0-33-generic N/A linux-firmware 1.157.20 Tags: xenial Uname: Linux 4.15.0-33-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 04/09/2013 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: P07ABK dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: NP900X3D-A03IT dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: FAB1 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP07ABK:bd04/09/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn900X3C/900X3D/900X3E/900X4C/900X4D:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP900X3D-A03IT:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1: dmi.product.family: ChiefRiver System dmi.product.name: 900X3C/900X3D/900X3E/900X4C/900X4D dmi.product.version: 0.1 dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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