I just upgraded to Ubuntu 17.10 about a week ago and things have been working fine. All of a sudden today my hdmi is not working correctly. When I plug in the hdmi and try to boot, I make it to the login screen. When I try to login, it seems to restart the Ubuntu boot process and takes me back to the login screen. If I remove the hdmi cable and log in, I can get in. If I then plug in the hdmi, it glitches out a little bit and then does the reboot behavior. To my knowledge, nothing has changed since yesterday.
Any idea how I can fix this?
I just rolled back (fresh install) to 16.04 and still have the issue of the system crashing and restarting when an HDMI cable is plugged in. I have tried multiple cables and the issue persists.
The odd part is, this is the same machine and same cables I have been using for over 6 months with no issues.