Comment 13 for bug 1765232

And now here's another test build with the upstream fixes. Note that the last patch needed too much backporting to do in short order, and I had to include one additional prerequisite:

http://people.canonical.com/~sforshee/lp1765232/linux-4.15.0-18.19+lp1765232v201804211053/

Please test the kernel from comment #12 first though, as I'm more inclined to revert the patches for the moment. We may consider adding them back later though with these additional fixes if they are confirmed to resolve these hangs. Thanks!