This happens even when no other apps (other than the routine/background processes) are running
- iStat shows the temps as :35-39c (no apps running) then jumps to 50-60c when the adapter is plugged in.
Again, this adapter is not actually connected to anything, just the presence of the plug in the Display/Thunderbolt Port triggers this temperature increase.
This problem has been present since i bought the machine last year .
I did replace the termal paste in this machine a few weeks back - you may be aware that there have been discussions that excessive amounts of factory applied themal paste were causing inefficent heat disspation.
I opened my MBP up and sure enough, there was paste all over the CPU & GPU chips.
After reapplying the paste correctly, the temps dropped a solid 7c -
but the temp rise when the DisplayPort is used remains the same, it was roughly 15-20c both before and after the thermal paste cleanup.
Well I have a 15" 2011 model and will connect my Apple DVI adapter and see what happens.
But in all honesty I would of taken the system in for a check and or returned it for refund when I first noticed this.
Could also be some type of short in the adapter.
OK it has been a few minutes since I connected the DVI adapter and my temps are exactly the same with or without the adapter connected.
So I would suspect a short in either the adapter or the port on your MBP.
I've tried it with two different adapters, DP->HDMI and DP->VGA with the same temp increase results.
Your tests suggest the problem is with my MPB so I'll take it in for a check.
Other users have reported temp increases when connected to external displays/devices,
but this confirms that the problem is most likely the reported logic board fault.
Sincere thanks for your help in figuring this out