I have same problem with Dell Latitude E7480 with attached dock station (without station I haven't the bug). Ubuntu 18.04, kernel 4.15.0-39-generic.
I have workaround the bug with unload module before sleep and load after resume https://gist.github.com/rekby/0f0859bca9c80d6b8fc52ec13b3b0772
I have same problem with Dell Latitude E7480 with attached dock station (without station I haven't the bug).
Ubuntu 18.04, kernel 4.15.0-39-generic.
I have workaround the bug with unload module before sleep and load after resume /gist.github. com/rekby/ 0f0859bca9c80d6 b8fc52ec13b3b07 72
https:/