https://bugs.kde.org/show_bug.cgi?id=523054

--- Comment #9 from Zamundaaa <[email protected]> ---
(In reply to Harald Sitter from comment #5)
> I don't know how kwin picks its render node, but I have a feeling it will
> want to know all render needs before picking one and that fundamentally
> needs the udev queue to drain first so we can be certain all nodes have been
> created. Paging Xaver for some kwin thoughts on this.
It's worse than that, KWin 6.7 chooses a KMS node, not just a render node. If
either gets removed, it quits.
So if KWin starts while simpledrm is still in charge, and the real driver
finishes loading, simpledrm gets removed and you'll face a black screen.

git master doesn't have that limitation anymore though, it can deal with any
KMS and render nodes being removed. The greeter would be software-rendered in
the above situation, but we're hoping to solve that as well.

Long story short, we can try removing the udevadm settle for 6.8

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