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Thinkpad X13 AMD: Problems with external monitor wake up after suspend

Since kernel version 6.1.57 I have problems with external monitor wakeup after suspend on Thinkpad X13 AMD Gen2 Notebook.

Notebook is in docking station with closed lid. Suspend & Resume. The external monitor gets no signal. After randomly typing Ctrl+Alt+Fn for switchung consoles, the monitor at some point gets signal and is usable again.

It worked with kernel 6.1.56.

I also tested the following kernels:

  • It works with: 5.10.200, 5.15.138, 6.1.44, 6.1.55, 6.1.56
  • It doesn't work with: 6.1.57, 6.1.58, 6.1.60, 6.1.62, 6.1.64, 6.5.11, 6.6.1

I managed to compile a 6.1.57 kernel and also a 6.1.64 kernel by reverting the changes from commit ec5fa9 "drm/amd/display: Adjust the MST resume flow" (https://github.com/torvalds/linux/commit/ec5fa9fcdeca69edf7dab5ca3b2e0ceb1c08fe9a?diff=split&w=1?diff=split&w=1) and with this suspend & resume works like before without any problems.

I also reported this at kernel.org (https://bugzilla.kernel.org/show_bug.cgi?id=218211) and at manjaro.org (https://forum.manjaro.org/t/problems-with-external-monitor-wake-up-after-suspend/151840)