Using linux kernel 4.1.2 on a Dell XPS 13 9343 and I noticed that when I suspend, it works, however, all the usb mounts are lost- flash drives etc. I would like it to stick when I resume, since there are things there that are running all the time.

This does not happen on my older Dell Latitude laptop, another Lenovo laptop or my PC. I have tried to disable auto suspend and use persist in the kernel parameters (usbcore) to no avail. Also looked into the BIOS and enabled powershare (doesnt do anything at all) as well as USB wake.

What else can I try? Is this a hardware issue or a BIOS issue or did I miss a kernel compile option flag etc? Thanks.

I wonder if this is related to USB 3 port behaviour perhaps?

FWIW, this Mint thread seems to describe the same.

If I find anything else of value I'll post again.

I don't want to lead you on a wild goose chase, so if this is not related to USB 3.0 controllers this can all be dismissed, but sometimes XHCI controller/driver behaviour is the cause of various strange issues to users, and many have simply disabled the XHCI controller in the BIOS where viable, but I recalled this openSUSE post where a user found a way to configure individual ports with the caveat - WARNING: all the below is chipset specific for the Intel 9 series. Just wanted to share that in case someone else finds it useful one day.

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Thanks ferrari. I disabled usb3 in the BIOS as a proof of concept and indeed, it suspended and resumed properly. What an excellent observation. I guess I will use the same technique to disable xhci for that specific port. Maybe until the xhci driver improves...