Lol, it 100% repeatable. I have soundcard with USB hub functionality (MAudio MTrack HUB). It have 2 operation modes:
- When soundcard (which is USB hub too) connected to external power supply, it provides soundcard and USB hub functionality.
- When soundcard connected without external power supply, it provides only soundcard functionality.
It mean that if I turn off soundcard power supply, all devices become disconnected from hub, except soundcard device. For laptop, this soundcard represented as USB hub with one connected device. And if i turn off power supply for my soundcard (the sound card is connected to the same 220V splitter as the speakers) when my laptop is sleeping, this bug appears.
I think that everyone can repeat this steps, using generic USB hub and disconnect some devices from hub, while laptop is sleeping. Someone can try this?