ESXi 7u2: Passthrough device (GPU) locked after first use

[SaveServer]

Hallo,

it seems, that ESXi looks the passthrough device (GPU) after the first use in a VM.

If I shutdown the VM with the passthroughed device and start another VM with the same passthroughed device it does not work.
When I reboot the host, then I can use the passthroughed device in the other VM.
But I think, that there is something wrong, when I must reboot the host, that ESXi release the passthoughed device.
Is there any solution?

 

[SaveServer]

I tried to fix my problem in the passthru.map with the following statments:

# Quadro K2000
10de 0ffe link false
10de 0e1b link false

or

# Quadro K2000
10de 0ffe d3d0 false
10de 0e1b d3do false

But d3d0 and link don't work
The GPU is always locked, when it was used once by a vm.

 

[SaveServer]

Today and after hours of test and reboots I have a new insight.

I can use the GPU in different Linux-VMs without any problem.
When the GPU is used in a Linux-VM I can later use it in a Windows-VM, too.
But if the GPU is once used in a Windows-VM, it remains only to be used in different Windows-VMs and no more in a Linux-VM.

So my conclusion is, that Windows seems to do something wrong, when the VM is shut down.
But the question is, how can I fix this problem?