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I'm using a P14S gen 2 AMD Thinkpad with my devices connected to a Thinkpad thunderbolt 3 gen 2 dock. The machine itself doesn't have thunderbolt 3 support, but it seems to fall back onto usb-c or otherwise find some way to function. I've been happily using it for about a year without any issues. However as of a recent pacman upgrade, my machine has stopped outputting to the display I have connected to the dock via displayport.
Extra context:
* Other devices connected to the dock (USB devices) all remain functional
* The monitor has a USB hub passthrough, which also works
* On boot, the manufacturer splash screen, bootloader, and LUKS prompt are displayed properly on the monitor
* However upon reaching the user login prompt, it will fail to output to the display
* The display will function when booting from a Windows drive on the same machine
* The display will also function when booting into the same Arch Linux version on a different machine
* The monitor still won't output when connected to the dock via HDMI as opposed to DP
From the above, I'm led to believe this is a software issue but I'm not too sure where to investigate. I've had a look through dmesg (link to output) but nothing in particular stands out as something that would indicate why my display has suddenly stopped working.
I've been able to unreliably get the user login prompt to display on the monitor by disconnecting and reconnecting the dock several times. However launching xorg will again cause the monitor to stop displaying output most of the time -- rarely, if the stars align, it will function as expected.
How could I go about resolving or further troubleshooting this issue? Happy to post lspci/xrandr outputs or my pacman log, or anything else that might be helpful.
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