Okay, the crash from tty7 happened twice in a row, after reboots, for
me. I now see that I'd changed two different variables when I thought
the simple "plymouth:debug" was acting as a workaround. I'd also changed
these lines in /etc/default/grub, to allow me to catch grub and test
boot parameters (rather than having it immediately boot the default)...

This version prevented a crash from occurring:
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=false

This version would allow a crash to occur:
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true

Regardless of which of the above settings are used, this one seems to always 
cause X to land on tty7 for me:
GRUB_CMDLINE_LINUX_DEFAULT="plymouth:debug"

The good news is that this has allowed me to capture a plymouth-
debug.log file generated at a boot that I suspect will soon result in a
crash...

** Attachment added: "plymouth-debug.log"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/625239/+attachment/1566836/+files/plymouth-debug.log

-- 
X starts on wrong tty: pressing enter after 5 minutes crashes X
https://bugs.launchpad.net/bugs/625239
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