On my pretty much stock Ubuntu 18.04 installation where I had installed DisplayLink I have noticed a couple crashes if the system is allowed to idle and go to sleep.
I pulled these messages out of the logs.
Code:
Oct 25 16:58:36 XPS-13-9360 systemd[1]: Started Network Manager Script Dispatcher Service.
Oct 25 16:58:36 XPS-13-9360 systemd[1]: Starting TLP suspend/resume...
Oct 25 16:58:36 XPS-13-9360 nm-dispatcher[10458]: req:2 'down' [wlp58s0]: start running ordered scripts...
Oct 25 16:58:36 XPS-13-9360 wpa_supplicant[1093]: nl80211: deinit ifname=wlp58s0 disabled_11b_rates=0
Oct 25 16:58:36 XPS-13-9360 update-notifier.desktop[3818]: [23593:23602:1025/165836.599065:ERROR:connection_factory_impl.cc(400)] Failed to connect to MCS endpoint with error -106
Oct 25 16:58:36 XPS-13-9360 systemd[1]: Started TLP suspend/resume.
Oct 25 16:58:36 XPS-13-9360 systemd[1]: Reached target Sleep.
Oct 25 16:58:36 XPS-13-9360 systemd[1]: Starting Suspend...
Oct 25 16:58:36 XPS-13-9360 systemd-sleep[10597]: /lib/systemd/system-sleep/displaylink.sh: line 7: /tmp/PmMessagesPort_out: No such file or directory
Oct 25 16:58:36 XPS-13-9360 systemd-sleep[10597]: Suspending system...