KDE desktop no longer working when changing to older Linux Kernel 4.19

I am currently on latest kernel and tried setting

boot.kernelPackages = pkgs.linuxPackages_4_19;

However setting this kernel, on reboot the system does not start my desktop anylonger (Plasma KDE) but stays in a plain terminal. Does someone know what to do to just change the kernel, but keep everything else like before?

you should be able to do ctrl+alt+1 to get to a raw tty.

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do journalctl -fu display-manager.service to see why it failed to launch

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