Thanks for your bug report. It would be really helpful to have the content of dmesg when your system hangs. You can get it from another computer using ssh or you could extract it from /var/log/dmesg* files after a reboot. You can also check some of the existing bugs and see if they are the same as yours: - https://bugs.freedesktop.org/show_bug.cgi?id=111986 - https://bugzilla.kernel.org/show_bug.cgi?id=205169