Roland (Rolandixor) Taylor, as per your 
https://launchpadlibrarian.net/162401073/BootDmesg.txt :
[    0.131556] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
...
[   33.550027] platform microcode: Direct firmware load failed with error -2

As well, as per 
http://www.toshiba.co.uk/innovation/download_bios.jsp?service=UK an update is 
available for your BIOS (4.20). If you update to this following 
https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it 
doesn't, could you please both specify what happened, and just provide the 
output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Thank you for your understanding.

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https://bugs.launchpad.net/bugs/1091058

Title:
  1002:95c4 [Satellite Pro P300-16V] GPU locks up and the screen turns
  white

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