Thinkpad Display stays black after suspend on 5.9

Hey everybody,

since Kernel Version 5.9 the Display of my Thinkpad T570 with Intel Graphics stays dark after returning from suspend mode. If I look veeeeery carefully, I can see the Display itself is operating but only the light does not turn back on. I can blindly enter my Password and navigate to power off the Machine. After a reboot everything is back to normal until the next suspend.

This Problem only occurs with Kernel 5.9.*.
When I select 5.8.something in Grub everythin runs well.

Because I am not the experienced Linux User, I have no Idea how to start investigating this Problem.

Thanks in advance.

Fixed with latest Kernel Update to 5.10.

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