I have a Toshiba a75s231, if you have a Phoenix bios like I do there is very little ACPI support, I had to go into the bios and disable Hyper Threading to get my fans to speed up and slow down as they should, after I did that no more overheating, also if your laptop is around a year old you may need to take it apart to clean out the fans, I had to do this as well.
I have never had any video issues so I'm not sure what to do about that.
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