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Can't plug 4k monitor in without Ubuntu 20/21 crashing immediately

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My system is as follows:

RTX 2080TI with 3 DisplayPorts, 1 HDMI port, and 1 USB C port (DisplayLink). Plenty of ram and an AMD Ryzen 9. I have 3 non-problem QHD monitors plugged in via 2 displayports and an HDMI.

On Windows 10, the problem monitor works fine at 4k/60FPS using either the USB C or a DisplayPort. By itself, or with my 3 other monitors.

When installing Ubuntu 21 with xserver drivers instead of Nvidia proprietary, everything worked fine other than certain programs being a fair bit laggy (15fps) on the 4k screen.

I switched my driver to Nvidia 465 thinking that would solve it, but Ubuntu then refused to boot, getting stuck before seeing the login screen.

I rooted in and cleaned out the drivers and things worked again. I then installed the 'recommended/tested' Nvidia 460 drivers instead, same thing.

Thinking it was an Ubuntu 21 problem, I installed Ubuntu 20. Same issue down the line.

If I unplug the monitor, it boots fine with my other 3. The second I plug it back in (either USB C or displayport), it crashes Ubuntu. I've also tried booting it with just that monitor, or just 2 monitors, or in a different displayport.

Regardless of what I try, so long as this specific 4k monitor is plugged in and Nvidia 460/465 is installed, the graphics drivers refuse to work.

Is there any troubleshooting or testing I could do to get this setup working?

Edit: I have also tried on Pop! OS, same issue.

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