It sounds like you've hit the problem Nvidia mentions in their documentation:
http://us.download.nvidia.com/XFree86/Linux-x86_64/535.54.03/README/egpu.html
so I guess falling off the bus is just as bad as being unplugged.
Can you provide logs mentioning falling off the bus? I only recall a different user mentioning it recently in bug 2023585.
It sounds like you've hit the problem Nvidia mentions in their documentation:
http:// us.download. nvidia. com/XFree86/ Linux-x86_ 64/535. 54.03/README/ egpu.html
so I guess falling off the bus is just as bad as being unplugged.
Can you provide logs mentioning falling off the bus? I only recall a different user mentioning it recently in bug 2023585.