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I did upgrade my linux mint to version 20 today and straight after that noticed, that my games works a bit more laggy, than before. And ProtonGE not working at all. For example, if I open ARK with ProtonGE (5.9 or 5.11), I'm stuck with this screen:

With proton 5.0-9 works just fine, but still a bit more laggy. Does anyone know, what could cause this issues? On Linux Mint 19 I did not have such problems.
View PC info
model : GM107M [GeForce GTX 960M]
driver : nvidia-driver-440 - distro non-free recommended
But I didn't change nvidia driver. It was same in Linux Mint 19.
Last edited by DMG on 10 Jul 2020 at 8:31 pm UTC
View PC info
If in place try deleting the GE proton folders, rebooting steam, then re-"install" the Proton GE builds.
Also try running the application from the terminal, either by invoking the steam appid directly or by running steam from the terminal. when the game boots there maybe an error output that is helpful.
Here is message from console:
dmg@dell-pc:~$ steam steam://rungameid/346110Running Steam on linuxmint 20 64-bit
STEAM_RUNTIME is enabled automatically
Pins up-to-date!
Steam client's requirements are satisfied
/home/dmg/.steam/ubuntu12_32/steam -nominidumps -nobreakpad steam://rungameid/346110
[2020-07-11 15:36:47] Startup - updater built Jul 8 2020 23:10:46
[2020-07-11 15:36:47] Verifying installation...
[2020-07-11 15:36:47] Verification complete
STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy
Warning: failed to set thread priority: set failed for 4: -1: setpriority() failed
Warning: failed to set thread priority: set failed for priority 4
Warning: support for elevated priorities is most likely unavailable, suppressing future warnings
Warning: failed to set thread priority: set failed for 4: -1: setpriority() failed
Warning: failed to set thread priority: set failed for priority 4
Warning: support for elevated priorities is most likely unavailable, suppressing future warnings
Only error, what I can find in logs is this one:
15:57:54 rtkit-daemon: Failed to parse MakeThreadRealtime() method call: Argument 1 is specified to be of type "uint32", but is actually of type "int32"
I upgraded from Linux Mint 19
I tried, but did not help
Last edited by DMG on 11 Jul 2020 at 1:02 pm UTC
This section may be relevant, if we assume this also applies to drivers:
I'm on 19.3 myself, but haven't tried to upgrade yet. Everything works well already, and I did see on the Mint forums that some people had issues.
It's the easiest way to check if there is some cruft left behind from old installs in your home/steam dir