Lost GPU passthrough after change of logical CPU for VM

[ELP1]

Hello,

I experience quite strange issue. Long story short... I was in "rush" with setup of Unraid and VM and I checked all available logical CPU for VM. Now I have some time and I read that is good to keep at least one pair free for Unraid. So I decided that I will uncheck in my case CPU0 / CPU6 (i5 10400). However afterwards I do not see my physical GPU in VM anymore. Previously especially after Unraid upgrade to newer version I experienced same strange behavior. My GPU suddenly disappeared. Based on this experience I did .xml VM config backup, which always help me to recover with GPU passthrough.

 

Do you have an idea what could cause this problem?

Thank you for any suggestion.

 

EDIT: I solved it with switching GPU to VNC afterwards I changed the number of cores and then switch back to GPU Passthrough. 

Edited June 25, 2022 by ELP1