this post was submitted on 13 Nov 2023
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From what I understand, Nvidia may be right in this case and explicit sync seems to be the better approach.
There is a nice article on Collabora's blog about it and it sounds plausible to me: https://www.collabora.com/news-and-blog/blog/2022/06/09/bridging-the-synchronization-gap-on-linux/
Sure, but unfortunately from a user-perspective side of things what this meant is that for me XWayland (and thus, Wayland as a whole) has been broken for quite a while just because I happened to use an Nvidia card.
I've mentioned in a previous comment a few weeks ago, I do commend the couple of devs (that Nvidia has so graciously allowed to work on the OSS side of things) work into wiring up support for explicit synchronization and getting support added in upstream - but its been very saddening from my point-of-view to watch the discussion over at the related issue constantly go from "Well Nvidia just needs to support implicit sync" to "Well we can't, but what can we do to get things to work with explicit sync since we do support that" and back and forth on that for a year.
All of this of course, while the community is trying to drop X11 as fast as they possibly can now. If it were just a case of not being able to use Wayland for a bit longer, I would've still been a bit upset by it, but I could've lived with it. Unfortunately, X11 + Nvidia also doesn't work that great in my case. I have two 1080p displays that only run at 60Hz, and I could hardly get the desktop itself to run at a stable 60FPS without it constantly dropping frames from just having a web browser open which should not be difficult at all for an RTX 2080. I tried every single tweak on both the Nvidia X-settings side of things, various compositor options for KWin, Mutter, etc - nothing helped. The closest I got was using KDE's X11 session, disabling compositing from KWin and replacing it with picom... but even that wasn't great, and came with a whole handful of problems too.
Then surprise surprise, I finally get my AMD card (RX 6700XT so pretty much a lateral move), same monitors - X11 runs just fine for the few occasions where I can't use Wayland, and at the same time Wayland runs beautifully.