https://bugs.kde.org/show_bug.cgi?id=509669

--- Comment #11 from Akseli Lahtinen <[email protected]> ---
(In reply to fililip from comment #10)
> I managed to grab a video recording, this is from a 4K 240Hz display with
> 150% scaling and a 1kHz polling rate mouse. The commit removing async image
> updates seems to cause these delays. Hopefully it's more noticeable here.
> 
> Here's the video (I couldn't upload it here due to size restrictions):
> https://www.youtube.com/watch?v=BRfYCN5I7_s

Okay I believe it's happening. The problem is that is it our bug or a driver
bug.

I still can't get the bug to happen though, I have 3440x1440 monitor, and I
tried with both 150% and 200% scaling, and couldn't notice any issues.

It could be a driver bug. Do you get any messages related to the GPU if you
have `journalctl -ef` open in a terminal while doing this? Or in `sudo dmesg` ?

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