2021 MacBook Pro (M1) Display is blank when switching from PC2 (MacBook) to PC1 (Windows) back to PC2 (MacBook)

Update: I’m not sure what happened, but it has now decided to behave and works without a hitch… The only thing I did was open the clamshell and close it when KVM was on MacBook input and now I’m no longer having issues even with the clamshell closed.

Equipment:

  • Level1 1.4 Display Port KVM Switch - Dual Monitor - Two Computer
  • Alienware AW3821DW (Firmware MOB103 - Eco Mode OFF)
  • 2021 MacBook Pro (M1)
  • Windows PC (RTX 4080)

Cables:

  • Club3D USB C to Displayport Cable 1.4 1.8 Meter (MacBook Pro to KVM)
  • Club3D VESA Certified CAC-2068 DisplayPort to DisplayPort 1.4 2 Meter (KVM to Monitor)
  • Club3D VESA Certified CAC-2068 DisplayPort to DisplayPort 1.4 2 meter (Windows PC to KVM)
  • [USB-IF Certified] Spigen USB 4 Cable for Thunderbolt 4 Cable (x2)

Issue:

When I switch from PC2 (MacBook) to PC1 (Windows) back to PC2 (MacBook) I get a blank display and my monitor goes into standby mode. However when I unplug the USB-C to DP cable and plug it back in (either way works) it then works until I switch back to Windows to my MacBook again.

Is this an issue with software on the Mac side or is this possibly an issue with my monitor and/or the Club3D cable I’m using for the MacBook to KVM.

Note: I’m only using one monitor on the KVM currently, not the two that it is capable of.

Edit:

I noticed that if I keep the clamshell up the display will work when switching, only when the clamshell is closed will it no longer properly display the screen.

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