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Ready for a long weekend testing out the latest Steam Play Proton compatibility layer? Good news! Valve announced the release of Proton 6.3-1 along with a Proton Experimental update.

This is a big release as it rebases Proton from Wine 5.13 to 6.3 which comes with thousands of changes! That does include a lot of new Windows games that Valve say are confirmed playable on Linux including:

  • Divinity: Original Sin 2
  • Shenmue I & II
  • Mass Effect 3 N7 Digital Deluxe Edition (2012)
  • Tom Clancy's Rainbow Six Lockdown
  • XCOM: Chimera Squad
  • Bioshock 2 Remastered
  • Company of Heroes 2
  • logiCally
  • Rise of the Triad
  • Home Behind 2
  • Shadow Empire
  • Arena Wars 2
  • King Arthur: Knight's Tale
  • Rise of Venice
  • ARK Park
  • Gravity Sketch
  • Battle Arena VR

On top of all that it also updates DXVK (D3D9, D3D10 and D3D11 to Vulkan) to version 1.8.1, it upgrades VKD3D-Proton (D3D12 to Vulkan) to version 2.2, FAudio was bumped up to 21.03.05 and also Wine-Mono to 6.1.1.

A bunch of what was previously in the separate Proton Experimental was pulled into Proton 6.3 including: improvements for non-US keyboard layouts, improved video support, support for setting thread priorities via RTKit (or Unix priorities if your user has permissions), controller layout and hotplugging improvements in Slay the Spire and Hades, improved PlayStation 5 controller support and also improvements to Virtual Reality startup time and compatibility.

Further to that there's also improvements to Uplay sign-in, G29 steering support in Assetto Corsa Competizione, fixes for Microsoft Flight Simulator in VR mode, fixes for cutscenes in Bioshock 2 Remastered and also an overhauled build system to greatly reduce build times.

You will also find a new updates to Proton Experimental too including:

  • All changes from Proton 6.3-1.
  • Performance improvements around input, windowing, and memory allocation.
  • Added support for Vulkan child window rendering.
  • Better support Anno 1404 - History Edition.
  • Updated file distribution method to save disk space.

Full changelog here.

Update - 07/04/21: Proton 6.3-2 is out now fixing "stuttering mouse cursor issue during longer play sessions".

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dorron 2 Apr
Quoting: ColdPie
Quoting: dorron
Quoting: rustybroomhandle
Quoting: dorronGreat! Took them a long time to release a new one...

15 Feb - that's just a month-and-a-half. And I thought I was impatient. :)

My bad. I meant moving from wine 5 to 6 ...

What was there in newer Wine that you were waiting for? Most stuff that is important for gaming gets backported.

I was stuck in Skyrim Dragonborn with a glitch. With the new Proton based on Wine 6.3 now it works and i can progress...
Corben 2 Apr
Quoting: NanobangHey Corben, thanks for the heads up. How would I go about finding this core dump file if I needed to?
For Bioshock 1 Remastered I had a core file below: <your steam game library path>/steamapps/common/BioShock Remastered/Build/Final/core
So directly where the Bioshock.exe file was.

I guess it's a similar path for Bioshock 2 Remastered.

Last edited by Corben on 2 April 2021 at 6:57 pm UTC
XCOM: Chimera Squad was working perfectly (for me at least) when it released a year ago, but I'm glad to see it's now "officially" working.
ELEX running Out of The box..
Bioshock 2 Remastered?? Does that game not already work? I know it's been a while I played it think it was back at proton 4, but I know I played both games on Linux, so I'm kind of surprise to see it on the list unless it broke and got a fix or it runs 100% better on proton 6.
GOTHIC Playable Teaser is not that playable..

Very poor performance..
ugly 3 Apr
With the update to DXVK, with Proton 6.3-1, Mega Man Legacy Collection 2 is finally playable. Mega Man 8 in the collection has a video cutscene that shows the test pattern, but doesn't break the game. 7, 9 and 10 seem to work fine.
ljrk 5 Apr
I wonder how well one could switch over from dxvk to the wined3d vulkan backend. The doc of Proton still mentions `PROTON_USE_WINED3D` to

> Use OpenGL-based wined3d instead of Vulkan-based DXVK for d3d11, d3d10, and d3d9.

But with wine6.0 this can actually be a Vulkan backend as well. Idk how to enable it (if necessary).
BielFPs 5 Apr
For those using this version be aware
Derheim 5 Apr
Is it just me or does this release fixes the issue where trying to stream some games from pc to Steam Link would give no video on the screen on the steam link but audio ok?

This only happened to me while running games using proton, native games didn't have the issue. Also it only happened for games that opened any sort of window right before opening the actual game, say a non interactive non-in-game splash/launcher screen.

So glad I can use my steam link to stream from Linux again :D
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