Yeah same, even after their big update I had scratchy sound. Ran it with lutris, which I never used before, DXVK, no sound issues but laggy mouse movement, unplayable.
Putting up with the scratchy sound under Proton now.

Sound works perfectly under proton 4.11. Game seems to run smoother also.

Also it was crashing occasionally under proton 5.07, under 4.11 I've played for about 4 hours and no crash.

Yeah same, even after their big update I had scratchy sound. Ran it with lutris, which I never used before, DXVK, no sound issues but laggy mouse movement, unplayable.
Putting up with the scratchy sound under Proton now.

I've used lutris fshack-5.6.2, no lag whatsoever :-)

Sound works perfectly under proton 4.11. Game seems to run smoother also.

Indeed it does! +1

This seems to be fixed under proton 5.13.

With the new Simulator update the game runs extremely erratically on my system.

System Information

GPU: RX480 4GB
Driver/LLVM version: LLVM 15.0.6, DRM 3.49, 6.2.6-76060206-generic (0x67df)
Version: 22.3.5
Kernel version: POP!_OS 6.2.6-76070206-generic

Results

With all versions of Proton: game runs at 1-2FPS regardless of the graphics
At random I can manage to get the game playable at 60fps with High settings, but jsut going to the main menu and back causes the performance to drop to 1-2FPS
steam-588030-PROTON8.0_USEWINED3D.zip

I should add that by dropping the resolution to 800x600 the game is somewhat playable even at high settings, with around 30fps. But at my usual 1440x900 it's just unplayable.

I'm running with these specs:

OS: Debian 12
GPU (from lspci): Advanced Micro Devices, Inc. [AMD/ATI] Navi 22 [Radeon RX 6700/6700 XT/6750 XT / 6800M/6850M XT] (rev c5)
	Subsystem: Sapphire Technology Limited Sapphire Radeon RX 6700 [1da2:e445]
	Kernel driver in use: amdgpu
	Kernel modules: amdgpu

Driver (Debian package) firmware-amd-graphics:
  Installed: 20230210-5

CPU Model name:            AMD Ryzen 9 5950X 16-Core Processor

Works like a charm with default Steam Proton, I did have one (1) crash right after installing the update, not sure what caused it, but I did have old debugger launch options set. I removed those and set PROTON_USE_WINED3D=1 as recommended on ProtonDB.

I'm running with the following settings in 1920x1200:

And it's been coasting along with 60 FPS for a few hours now

@Thulium-Drake What version of Proton are you running?
I tried a clean install on a totally different computer, that has a clean install of Pop!_OS 22.04, and I have the same problem as my main desktop. If I add PROTON_USE_WINED3D=1 I get a black screen with proton experimental.

Specs:
i5-3470
32GB RAM
RX 6500 XT 4GB

I'm using Steam's default, which I think is Proton 8.0-2 at the moment

EDIT: no, wait, it's using Proton 7.0-6 according to the Compatibility menu :-)

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev c7) (prog-if 00 [VGA controller])
	Kernel driver in use: amdgpu
	Kernel modules: amdgpu

CPU Intel core i7-4790k, 32GB RAM.
Uname -a Linux prodesk 6.2.6-76060206-generic #202303130630~1685473338~22.04~995127e SMP PREEMPT_DYNAMIC Tue M x86_64 x86_64 x86_64 GNU/Linux

OpenGL renderer string: AMD Radeon RX 480 Graphics (polaris10, LLVM 15.0.6, DRM 3.49, 6.2.6-76060206-generic)

So this would suggest there is a regression with Proton 8 (incl. Experimental), as the game just displays black on it.

However after going to the main menu and back, I'm back to 2FPS and severe graphics glitches, so it didn't solve anything in the end...

The most frustrating thing is that when it does work, it works at 60fps no problem and with no glitches

Okay I solved these issues on the other desktop, will try later on the main desktop. Apparently it's caused by the "Reflections slider", setting it to very high gets rid of them, anything less causes severe bugs.
RX6500xt with driver 22.0.0 and Proton 7.0-6 and USE_WINED3D set to 1.

So I did some extra testing, with and without PROTON_USE_WINED3D=1. Apart from that I didn't change any game settings.

Without:

• 7.0-6 crashes
• 8.0-2 works fine, 60 FPS, no glitches whatsoever
• experimental, works fine

With:

• 7.0-6 works fine
• 8.0-2 crashed after the menu
• experimental crashed after the menu

The only thing I didn't mention, I'm running the following kernel:

Linux 6.1.0-9-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.27-1 (2023-05-08) x86_64 GNU/Linux

@Thulium-Drake I get different results than you do...

Without:

7.0-6 crashes
8.0-2 works with no glitches but 5-6FPS at best, and it makes the entire DE lag (not just the game!) as long as the game is running. Putting the pause on has no effect.
experimental, same as 8.0-2

With:

7.0-6 works fine, but graphical glitches as before depending on settings, and also performance is low compared to windows.
8.0-2 crashed after the menu
experimental crashed after the menu

It does the same on both PCs:
Kernel: Linux prodesk 6.2.6-76060206-generic #202303130630~1685473338~22.04~995127e SMP PREEMPT_DYNAMIC Tue M x86_64 x86_64 x86_64 GNU/Linux on both
POP!_os 22.04 on both
AMD Radeon RX480 4GB or AMD Radeon RX6500xt
Intel Core i7-4790k or Intel Core i5-3470
32 GB RAM on both

Inxi for the main PC: https://gist.github.com/RAD750/7d1c1c3a359115e50387ebc498244ece

So it's either a regression in the kernel, some problem of Pop OS or some other problem, but not hardware related...

I see you have the game running in Windowed mode, did you also notice these things when running the game in fullscreen?

Apart from that, I'm not well-versed enough in all the graphics libraries that come with Wine/Proton to tell you what's missing. Maybe someone else can chime in there?

I did both tests in Windowed as well as in Full screen, and there was no noticeable difference on both machines.
I must add that other Proton games work fine, and also when I was still a beta tester for the game, switching from the beta to the old version (Overhauled) also made the game run fine. One of the devs suggested it is because they moved from a forward render path, to a deferred one.

It would appear that Diesel Railcar Simulator (another Unity game) suffers from the same 4FPS issue when running on dxvk, so this would suggest a vulkan issue on my end rather than an issue with Derail Valley. The question is: how to troubleshoot that?

Hmm, don't really know :/ as I mentioned, I'm not too familiar with the intricate details of the libraries involved in making it go.

What you might want to try is running the game using Lutris instead of steam (if the DRM allows for that), as that will at least give you some extra options to change in regards of versions of graphics libraries:

This is my config for Battle.net and I needed to change the VKD3D version to 2.8 to make Diablo 4 run at all for example.

Whitelist Request

System Information

• GPU: Radeon RX 7900 XTX
• Video driver version: Mesa 24.3.3
• Distro version: CachyOS
• Link to full system information report: https://pastebin.com/FCbp87aV
• Proton version: Proton 9.0-4

I confirm:

• [x] that pressing the Play button in the Steam client is sufficient.
• [ ] that runtime config options are necessary to run the game.
• [x] that no workarounds other than PROTON_* env variables are necessary.

Issues

• [x] I haven't experienced any issues.
• [ ] There are no issues left open for this game.
• [ ] Although I consider the gaming experience equal to Windows there are remaining issues: