There are some observations I'd like to mention:
1. I have noticed that the "turned off twice" behavior is not related with this
but. It happens on my desktop pc as well.
2. Just before the login windows is displayed (i.e. ,I think, while gdm is
loading), the pointer is shown as a turning wheel (or something like that). The
wheel jumps back and forth during this loading period.
3. The driver I am ("was") using is labeled as "intel" in /etc/X11/xorg.conf
and a more complete name for it is "intel - Experimental modesetting driver for
Intel integrated graphics chipsets" as given in the Screen and Graphics Card
Driver application. Sİnce the graphics card I have is also supported by the
driver labeled as i810, I manually modified xorg.conf and now I don't observe
the jumping behavior I've described above. (By the way I was not able to change
the driver with the Screen and Graphics Card Driver application, but this is
probably another bug.) I have already rebooted the laptop successfully several
times after changing the driver to i810.
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[Gutsy] Toshiba U200 random crashes on shutdown
https://bugs.launchpad.net/bugs/150943
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