Connection Lost when using Linux + Proton

I have been having issues when using Linux + Proton (Experimental or GE-Proton8-32) where I can start the game just fine and get to character select, but when I press “Enter Game” the connection dialog starts up and then a gong sound happens and the connecting dialog goes away and maybe 30 seconds later I get a “Connection Lost” dialog.

This happens maybe 95% of the time. Sometimes I am able to get past this and it will log me into town, but when I try and zone into a new area, the load screen just runs indefinitely.

This does not happen when I just use the Native Linux binary without Proton. I am able to log in just fine and play the game, which is great, except this mode does not support 5120x1440 resolution for some reason. It is stuck with a max resolution of 3440x1440 and it stretches so it looks not so great. If I set %command% -force-vulkan when using the Native Linux binary it gets rid of the stretching, but the menu buttons are all shifted out of place and there are some graphics glitches.

I’d love to figure out why Linux + Proton has so many issues on my setup. It used to work super well last summer until something changed and I encountered this issue before. I actually opened a support ticket 22545 that really didn’t get very far because support was treating this as an ISP issue when I really think it is a deeper problem when using Linux + Proton.

To be honest I would be totally fine using the Native Linux binary if I could get 5120x1440 resolution working, so if anyone has any thoughts on fixing that issue that would be great to hear.

Attached is my Player.log (133.8 KB)

 OS: Fedora 39 ThirtyNine
 Kernel: x86_64 Linux 6.7.5-200.fc39.x86_64
 NVIDIA Driver Version: 545.29.06
 Resolution: 5120x1440
 DE: GNOME 45.2 on X11
 CPU: AMD Ryzen Threadripper PRO 3975WX 32-Cores @ 64x 3.5GHz
 GPU: NVIDIA GeForce RTX 3090 Ti
 RAM: 26620MiB / 257544MiB

A quick follow up. After reading more of the reports on ProtonDB one of the posts recommended using an older version of Proton, so I tried 6.3-8 and I am able to log in and play without issues. Any proton version greater than this will result in a “Connection Lost” error after pressing “Enter Game”.

I am unsure how other people using Linux that are using Proton are not seeing this as a problem. The only thing I can think of is it is an issue with 5120x1440 or my specific NVIDIA card. I have a Steamdeck that can run Last Epoch fine with the Linux Native binary or with any version of Proton.

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