Additional info...

Upon invoking the freeze, Ctl-Alt-F3 sometimes brings up a terminal session on 
If it does, Ctl-Alt-F2 will switch back to GNOME which will remain frozen for a 
while, but will allow switching back and forth with the Ctl-Alt-F# keys.

Running "top" on tty3 shows no processes taking much %CPU.
Observed a message "[TTM] Buffer eviction failed" 3 times (on tty3) while 
waiting for unfreeze.

Sometimes, Ctl-Alt-F3 is also unresponsive upon freeze, but did
eventually switch to tty3 (after a about 20 seconds).  This hasn't been
tested much yet.

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  System unresponsive to keyboard and mouse clicks when changing screen

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