Created attachment 625547 [details]
Description of problem:
usb flash disk chande device after resume from suspend if booted from live in yellow charging USB port (back side on Lenovo T520)
Version-Release number of selected component (if applicable):
Steps to Reproduce:
/dec/sdb changes to /dev/sdc
Created attachment 625548 [details]
I encountered similar problem on Lenovo T420s. I got the flash disk partition renamed from /dev/sdb1 to /dev/sdc1 after several suspend/hibernate/suspend to both/resume cycles that rendered my live system unusable (due to rename). Thus it seems not to be 100% reproducible on my system. I had the flash disk connected to yellow charging USB port, but I am not sure whether it is the real source of the problem (I will retry to reproduce this with regular USB port).
Created attachment 627414 [details]
Created attachment 627429 [details]
This is USB doing device re-enumeration. There really isn't anything that can be done here. We'd suggest you use UUIDs or labels for devices instead of raw device nodes.