Just tested and the problem still occurs. I ran the command you gave,
but I don't know if files are uploaded. The python script showed errors
in the terminal.

Incidentally, I found steps which have reproduced the problem 10 out of
10 times:

- open dash
- search for 'term'
- start the 'Terminal'
- enter the following command: 'dmesg | less'
- scroll the text using the cursor keys
- within a few lines scrolled, the screen goes black

Could it have something to do with the Terminal being partial
transparent and there is a regression in that part of the driver.

NB The live version I tested:

Ubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140123)
casper-uuid-generic: 48ace7dd-f966-41f6-95c0-f0ccca67ce91

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https://bugs.launchpad.net/bugs/1247624

Title:
  Laptop screen is turned off, needs shutdown to work again

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