Comment # 13 on bug 1079416 from Martin Kincl

I can confirm this issue on an HP ProBook 4510s with core2 duo T5870 and Radeon
HD4330, except all the TTYs close. Only tty7 shows the remains of the tribar
plymouth progress bar and tty10 still shows the log. No excessive heat on this
machine. One update before it started doing this, the system did eventually
shutdown about 10 seconds after plymouth disappeared, but did so in a way that
the hard drive was apparently shut down abruptly in the middle of an IO
operation.