I ran into this one (1) time just after switching to the 4.4.0 kernel. I have an Intel HD4400 Integrated graphics card on an Asus Z87 MBoard. (Intel i915 driver)
To escape, I used another device to log into the machine (ServerAuditor on my Android phone via wireless) and did a shutdown. After rebooting, the problem has not re-appeared and I can do all the usual Alt-Ctl-Fn switches and the console responds as usual after a timeout and monitor shutdown (such as overnight or going out for a while) -- G.Wolfe Woodbury redwo...@gmail.com