@gzx9755 Thank you for the confirmation. This is a good sign either the Radeon drivers or Thunderbolt Software can manage the Radeon VII fans in suspend mode. Hopefully Apple can work with AMD to integrate these changes into their Mac firmware and macOS graphics drivers. Can you share the Intel Thunderbolt Software or Thunderbolt Control Center you're using on the Thinkpad P50?
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2020 14" MSI Prestige 14 EVO [11th,4C,G] + RTX 3080 @ 32Gbps-TB4 (AORUS Gaming Box) + Win10 2004 [build link]
i remember, i don't use special tools. just intel thunderbolt tools. (it included in micosoft 10 or lenovo vantage? i don't know. sorry) i only use pre-installed thunderbolt tools.
my thinkpad P50 now in my home. and, i'll go to home when sep, 30. if i can do, i will check my software and report in this post for you. 
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
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i'm sorry to late.
my thinkpad P50's thunderbolt software is just intel thunderbolt software for windows.
software package version is 17.3.74.400.
and, i use lenovo vantage update my thinkpad's thunderbolt software.
if you any another needs to me, please mention to me. thank you
p.s. i cannot mention to you in this post. if you can see another mentions, i tell you so sorry for many mentions.
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
.