Bug#623701: GPU temperature returns ~10C higher than really measured

[Steve Clark]

The problem has now worsened. The temperature difference has risen to
between 15C & 20C greater than it should be. The problem also occurs
with the Nouveau driver.

All software readings give the same result, e.g. lm-sensors, Mate
sensors applet, nVidia settings.

Unfortunately, nVidia are unable to help as they do not have my video
card to hand for testing.

Could this be a kernel bug?