Graphical glitching in X11

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1

In Fedroa 41 I recently upgraded my monitor from 3840x1600 145hz to 5210x2160 resolution at 165hz, this is fine in Windows and fine in Wayland, however in x11 i get weird graphical glitches at the bottom of the screen. Primarily towards the bottom around where I have the taskbar. It mostly happens to dash to panel, but it has done it in the middle of the screen.

If I drop the frequency to 100hz this disappears. So of course I thought cable and bandwidth, so I bought an overkill cable and the same thing is happening. Again this does not occur in Windows(dual boot), or games on x11 or even a Wayland session, but Wayland is a world of issues in itself so I prefer to stick to x11.

Any help is appreciated.
Thanks
glitches
glitches2

I took a video and created a couple gifs of the example in shotcut.

2

The flickering looks part of whatever is drawing the dock, or part of the overall compositor or DE.

I’d try disabling the compositor from the current DE; and also test from GNOME as-is (no dock/extensions) from Workstation.

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Disabling all extensions didn’t help.

4

Try to disable animations for gnome gsettings set org.gnome.desktop.interface enable-animations false and to enable it if still have problem gsettings set org.gnome.desktop.interface enable-animations true

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5

That didn’t resolve the issue either.