Bug 106713

Since the upgrade to xorg 1.20 I have a similar issue. If I start F1 2017 (Vulkan) on Plasma on Wayland in fullscreen mode, the game will just freeze with a black screen. If I start the game again, it tries to report that crash to Feral, not sure if they can help as it didn't happen with xorg 1.19.
If I select the window mode in the Feral launcher, the game starts, the intro video will be shown and I can play.

Arch Linux
Linux 4.17.2 with AMDGPU.DC=1
Plasma 5.13.1
Wayland 1.15
xorg 1.20
Mesa-git with RADV (2018-06-25)
Radeon RX480

Do these fixes help?

https://cgit.freedesktop.org/xorg/xserver/commit/?id=3da999a0390407d512bf784e4faf01482bfff9ea
https://cgit.freedesktop.org/xorg/xserver/commit/?id=4d5950ce14676f970d9de97380929a93948b98f2

Just upgrade to xorg 1.20.1 in the hope this release would fix this bug. If I start F1 2017 (Vulkan) in fullscreen, I can see now the loading screen, so at least something must have changed. But once the games tries to play the into video, a black screen will be shown again. If I enforce the window mode via Kwin (ALT+F3) with a window boarder, the game usually can be started, but sometimes it crashed and created a report for Feral.

Arch Linux
Linux 4.17.14 with AMDGPU.DC=1
Plasma 5.13.3
Wayland 1.15
xorg 1.20.1
Mesa-git with RADV (2018-08-08)
Radeon RX480

Another game where I have this issue is on Witcher 3 in Wine with DXVK (Vulkan). If the game loads, only a black screen will be shown until I set the game to window mode with window boarders. Tested as well on Plasma Wayland.

In Warhammer 40000: Dawn of War III with Vulkan enabled, I had to change as well to window mode with window boarders to see the output after starting in the game a new match, but at least I could run the benchmark without any issues.

Serious Sam Fusion 2017 (beta) and The Talos Principle are affected as well, they even crash if I don't set the fast enough to window mode with Kwin (ALT + F3).

I can't seem to reproduce this, does it still happen with Mesa >= 18.2.y and libX11 >= 1.6.7?

I spoke too soon, Talos Principle hangs using Vulkan if "Enable V-Sync" is enabled in the graphics options. Mesa's x11_manage_fifo_queues hangs in xcb_wait_for_special_event here:

      while (chain->last_present_msc < target_msc) {
         xcb_generic_event_t *event =
            xcb_wait_for_special_event(chain->conn, chain->special_event);

So it looks like a PresentCompleteNotify event is either lost somewhere, or has the wrong MSC value.

https://gitlab.freedesktop.org/daenzer/xserver/commits/xwl_present_msc_bump-sync_flip fixes this for me.

Thanks for the report, fixed in xserver Git master:

commit ace551d8a2603e37b18237a52f62d627c75d9e2a
Author: Michel Dänzer <michel.daenzer@amd.com>
Date:   Thu Oct 18 17:42:01 2018 +0200

    xwayland: Complete "synchronous" Present flips from xwl_present_msc_bump

*** Bug 107230 has been marked as a duplicate of this bug. ***

Will this fix be backported into a 1.20.x release? Currently running into this issue with any Vulkan games, including Proton games.

The fix is already on the server-1.20-branch in Git, so it'll be in the 1.20.4 release. Unfortunately, there's no specific plan yet for when that'll happen. Meanwhile, maybe ask your distro to pull fixes from the release branch.

*** Bug 109711 has been marked as a duplicate of this bug. ***