https://bugs.freedesktop.org/show_bug.cgi?id=101029
--- Comment #5 from Michel Dänzer michel@daenzer.net --- (In reply to Craig from comment #4)
Does Dmesg log to a file somewhere?
Depending on your distro, it might be captured in /var/log/kern.log*, /var/log/dmesg*, or in the systemd journal.