https://bugs.freedesktop.org/show_bug.cgi?id=97240
--- Comment #1 from Christoph Haag haagch@frickel.club --- Created attachment 125591 --> https://bugs.freedesktop.org/attachment.cgi?id=125591&action=edit dmesg
Almost forgot dmesg.
I think these messages correspond with the hang:
[ 64.406834] failed to send pre message 15b ret is 0 [ 106.006518] failed to send pre message 155 ret is 0