Desktop froze while watching a video in the browser

[jnns]

I watched an HTML5 video when the desktop environment froze and prevented any further input. The screen froze although the sound was still being played. I noticed the laptop's fan turning on for a minutes or so.

Only a reboot with the Magic SysRq Keys helped.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-session 3.34.1-1ubuntu2
ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13
Uname: Linux 5.3.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.3
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Jan 24 11:52:56 2020
InstallationDate: Installed on 2018-08-05 (537 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/usr/bin/fish
SourcePackage: gnome-session
UpgradeStatus: Upgraded to eoan on 2019-10-17 (98 days ago)

[jnns (jnns)]

This is reproducible: it just happened again.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It sounds like some part of the system has crashed. To help us find the cause of the crash please follow these steps:

1. Look in /var/crash for crash files and if found run:
    ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.

2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us.

3. If step 2 also failed then apply the workaround from bug 994921, reboot, reproduce the crash, and retry step 1.

Please take care to avoid attaching .crash files to bugs as we are unable to process them as file attachments. It would also be a security risk for yourself.

[Daniel van Vugt (vanvugt)]

Maybe it's not a crash, but still please try the steps in comment #3...

Jan 24 11:55:41 x1cbn gnome-shell[1893]: g_dbus_connection_call_finish_internal: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
Jan 24 11:55:41 x1cbn gnome-shell[1893]: Failed to DPMS: Failed to set connector 86 property 2: Keine Berechtigung
Jan 24 11:55:41 x1cbn gnome-shell[1893]: Failed to DPMS: Failed to set connector 86 property 2: Keine Berechtigung

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]