Public bug reported:
This seems to be the same problem I'm facing on Resolute and reported on
#2129826, but this time it's affecting the current LTS release.
When playing Unity3D games using Steam, if the game window is unfocused,
the game may freeze. If there were any sound effect being played, they
continue until they end playing and then they stop.
Steps to reproduce:
1) Open Unity3D game on Steam;
2) Make the window lose focus somehow (move a Firefox window on top of the game
screen, lock the screen, change monitor settings);
3) Notice how the game freezes.
When closing the game, it will ask if you want to force close it or
wait, as the game is now frozen, and Alt+Tab seems unable to focus the
game if there is more than one window open, so keyboard commands (as
Alt+F4) can't be sent to the frozen game.
So far, this was observed with Demonic Mahjong, PHOTON CUBE and Prime of
Flames. It can be reproduced using the Prime of Flames Demo on Steam.
The computer is an IdeaPad Gaming 3 15ACH6 with a NVIDIA GTX 1650,
nvidia-smi says driver is 580.95.05, nvidia-driver-580 package was
installed. I'm using Xubuntu Noble.
I see no message on dmesg or syslog related to nvidia or gpu hang or
anything like that.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: nvidia-driver-580 580.95.05-0ubuntu0.24.04.2
ProcVersionSignature: Ubuntu 6.8.0-86.87-generic 6.8.12
Uname: Linux 6.8.0-86-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Mon Oct 27 00:19:04 2025
InstallationDate: Installed on 2017-06-13 (3057 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: nvidia-graphics-drivers-580
UpgradeStatus: Upgraded to noble on 2024-08-04 (448 days ago)
modified.conffile..etc.cron.daily.apport: [deleted]
** Affects: nvidia-graphics-drivers-580 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble third-party-packages
** Attachment added: "Proton log of Prime of Flames, the freeze is at 1524.045
on the log"
https://bugs.launchpad.net/bugs/2129858/+attachment/5920632/+files/steam-1937750.log
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https://bugs.launchpad.net/bugs/2129858
Title:
Unity3D games freeze when the game window loses focus
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