Add me to the list of those having this issue, but also have a partial fix. I am running a Thinkpad P50 with Nvidia display adapter. 18.04 was great, never any issues with suspend or resume. I upgraded to 20.04 a couple of weeks ago and immediately began encountering the reboot on resume issue. Suspend worked fine, the LED on the cover dimmed and brightened to indicate it was asleep, external displays went into power save, etc. But when trying to resume it rebooted from scratch every time.
I found this article https://itsfoss.com/ubuntu-close-lid-suspend/ and followed the steps in it. To my surprise, pm-utils was not installed, so I installed it. I also made the suggested edits to /etc/systemd/logind.conf plus a few more, my edited file is below. After these steps, I can now resume from suspend successfully. My laptop display remains dark but the external monitors come on and show the desktop. If I logout and back in then all is fine and all displays work. Here is my edited config file: [Login] #NAutoVTs=6 #ReserveVT=6 #KillUserProcesses=no #KillOnlyUsers= #KillExcludeUsers=root #InhibitDelayMaxSec=5 HandlePowerKey=suspend HandleSuspendKey=suspend #HandleHibernateKey=hibernate HandleLidSwitch=suspend HandleLidSwitchExternalPower=suspend HandleLidSwitchDocked=suspend PowerKeyIgnoreInhibited=no SuspendKeyIgnoreInhibited=no #HibernateKeyIgnoreInhibited=no LidSwitchIgnoreInhibited=no #HoldoffTimeoutSec=30s #IdleAction=ignore #IdleActionSec=30min #RuntimeDirectorySize=10% #RemoveIPC=yes #InhibitorsMax=8192 #SessionsMax=819 -- 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/1848771 Title: Reboot after resume from suspend (deep) Status in linux package in Ubuntu: Incomplete Status in ubuntu-release-upgrader package in Ubuntu: Invalid Bug description: After upgrading to Kubuntu Eoan (19.10) yesterday, my laptop crashes after resume from suspending. This is regardless the way of suspending (closing lid, selecting suspend from sddm, systemctl suspend). The journal shows: ferry@chromium:~$ journalctl -b -1 -e .. sddm[1106]: Message received from greeter: Suspend NetworkManager[836]: <info> manager: sleep: sleep requested (sleeping: no enabled: yes) NetworkManager[836]: <info> device (60:73:BC:BA:B8:68): state change: disconnected -> unmanaged (reason ' NetworkManager[836]: <info> device (60:73:BC:23:8F:3E): state change: disconnected -> unmanaged (reason ' NetworkManager[836]: <info> device (p2p-dev-wlp1s0): state change: disconnected -> unmanaged (reason 'sle NetworkManager[836]: <info> manager: NetworkManager state is now ASLEEP systemd[1]: Reached target Sleep. systemd[1]: Starting Suspend... systemd-sleep[1238]: Suspending system... kernel: PM: suspend entry (deep) On resume (keypress, open lid) resume starts but immediately crashes and reboots. The laptop is an Acer 720p Chromebook with Chromium replaced and working fine with Kubuntu since 5 years or so. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: ubuntu-release-upgrader-core 1:19.10.15 ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1 Uname: Linux 5.3.0-18-generic x86_64 ApportVersion: 2.20.11-0ubuntu8 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: KDE Date: Fri Oct 18 18:45:53 2019 InstallationDate: Installed on 2017-07-13 (826 days ago) InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: ubuntu-release-upgrader UpgradeStatus: Upgraded to eoan on 2019-10-17 (0 days ago) VarLogDistupgradeTermlog: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1848771/+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
