Quoting Paul Kocialkowski (2017-07-18 16:16:26)
It may occur that a hotplug uevent is detected at resume, even though it does not indicate that an actual hotplug happened. This is the case when link training fails on any other connector.
There is currently no way to distinguish what connector caused a hotplug uevent, nor what the reason for that uevent really is. This makes it impossible to find out whether the test actually passed or not.
And you may get more than one and then this skips even though the test passed. Looks like the patch is overcompensating. What you can do is repeat the test a few times, and then look at all the different errors you get. If the connector remains (no mst disappareance) once it goes bad, it should remain bad and so not generate any new uevent. Or you only repeat the test whilst link_status[old] != link_status[new]. -Chris