Comment 6 for bug 1043755

Ah - indeed, I see that your /proc/cmdline shows you are booting without 'splash' as a boot option. Which means this should not be showing a splash screen either on startup or on shutdown. If it's still showing a splash screen on shutdown, that would seem to be a bug in plymouth. However, I can't reproduce this behavior at all. Can you please do the following:

- switch to console with Ctrl-Alt-F1
- log in
- run 'sudo -s' to get a root shell
- confirm that 'grep splash /proc/cmdline' doesn't return anything (i.e., you are currently booted without splash)
- run 'service lightdm stop' (and confirm that this command succeeds... if it doesn't, then something else is wrong)
- run 'plymouthd --mode=shutdown'
- run 'plymouth show-splash'
- confirm that you do NOT get a graphical splash screen, but instead get a switch to a different text console
- hit Ctrl-Alt-F1 again to switch back to your root login
- run 'plymouth quit' to stop plymouth
- run 'service lightdm start' to restart X

Please report the results from the above test.

> What, at this point is in the list of possible culprits? Graphics Card? Driver?

At this point, I have no idea at all what's causing the hang on shutdown. It *may* be the graphics driver - but what shows up on the screen may also be entirely unrelated to the hang. The point of asking you to run without 'splash' was so we could see the output of whatever is happening at shutdown.