Thanks for reporting this, and your help is needed to identify the patch that causes this regression.
There are 260 patches between 5.3.0-61 & 5.3.0-62, and it requires some testing with bisects (see below). $ git bisect start $ git bisect good Ubuntu-5.3.0-61.55 $ git bisect bad Ubuntu-5.3.0-62.56 Bisecting: 260 revisions left to test after this (roughly 8 steps) [19357b3b0835b96039e907f65ae203f7adc48ef6] epoll: atomically remove wait entry on wake up A test kernel is available @ https://people.canonical.com/~alexhung/LP1888570/. Let me know whether it is pass or fail so I can build a next version. -- 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/1888570 Title: poweroff not working after apt upgrade Status in linux package in Ubuntu: Confirmed Bug description: System-Information: Description: Ubuntu 18.04.4 LTS Release: 18.04 ###################################### Working packages: - Kernel 5.3.0.61.114 - linux-firmware 1.173.18 Problem occurs when upgrading (anyone of) these packages - Kernel 5.3.0-62.56 - linux-firmware 1.173.19 I use an Acer Aspire E5-771G Notebook with a fresh installation of Ubuntu 18.04. Till the last upgrade everything works as expected. The last upgrade brings two new kernel versions (as mentioned above). Now the system stucks at the very end of the power down sequence. Even SysReq-O will not work (only SysReq-B will work). Because I use Systemback, I time shift to the previous system and then install package by package to see what will bring in the problem. If I install any of the mentioned kernel updates the problem will show up. I had ask the above question on "askubuntu.com". I was directed to upgrade the BIOS, But even after doing so the problem still persist. I am not sure if I do it right (APT pinning). I currently create a file /etc/apt/prefereces.d/kernel. I add an entry for every of the following packages to block the version mentioned above (Pin: version: <see above> Pin-Priority: -1): linux-generic-hwe-18.04 linux-headers-generic-hwe-18.04 linux-image-generic-hwe-18.04 linux-modules-nvidia-440-generic-hwe-18.04 linux-firmware After doing so "apt list --upgradeable" will not list the packages in question and the PC will power down normally (and SysReq-O WILL work). In the meanwhile there are newer versions of the kernel online, so the above mentioned pinning will allow the newer kernels to get installed and the problem will show up again. So I block these versions too. BTW: Due to the stuck I am able to see some other error messages that are not reported in the journal. The very last 3-5 lines show: shutdown [1]: Failed to wait for process: Protocol error These lines are present although in the working kernels, but hard to see, because the system powers down some ms after these lines are displayed! This problem seams to be solved more than one year ago in the upstream kernel! --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.15 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: gneiss 1929 F.... pulseaudio /dev/snd/controlC0: gneiss 1929 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2019-05-02 (448 days ago) InstallationMedia: MachineType: Acer Aspire E5-771G NonfreeKernelModules: nvidia_modeset nvidia Package: linux (not installed) ProcEnviron: LANG=de_DE.UTF-8 SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> PATH=(custom, no user) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-61-generic root=UUID=0b245afe-758b-4e45-a473-ad2077260d8f ro noplymouth resume=UUID=79a9e809-6ba1-491b-acfc-1816057c2dee ProcVersionSignature: Ubuntu 5.3.0-61.55~18.04.1-generic 5.3.18 RelatedPackageVersions: linux-restricted-modules-5.3.0-61-generic N/A linux-backports-modules-5.3.0-61-generic N/A linux-firmware 1.173.18 Tags: bionic Uname: Linux 5.3.0-61-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip input lpadmin plugdev sambashare sudo video _MarkForUpload: True dmi.bios.date: 09/02/2015 dmi.bios.vendor: Insyde Corp. dmi.bios.version: V1.23 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: EA70_HB dmi.board.vendor: Acer dmi.board.version: Type2 - A01 Board Version dmi.chassis.type: 10 dmi.chassis.vendor: Chassis Manufacturer dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.23:bd09/02/2015:svnAcer:pnAspireE5-771G:pvrV3.72:rvnAcer:rnEA70_HB:rvrType2-A01BoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion: dmi.product.family: BDW dmi.product.name: Aspire E5-771G dmi.product.sku: Aspire E5-771G_0884_1_23 dmi.product.version: V3.72 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1888570/+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
