Dell Laptop diagnostic special key sequence

Interesting little tid-bit. I've had a lot of drama with my Dell Latitude E6500 throttling when it gets warm. This has largely been resolved by installing BIOS A19 and keeping the heat-sink clean.

A recent discovery I found on Dell's forums is the diagnostic key sequence -

Hold shift and fn whilst typing 1-5-3-2-4, release then press fn + R

This diagnostics screen will give you readouts and let you change some thermal settings.

When the mode is enabled your keyboard lights will do some funky things. To reset back to defaults you need to shutdown and restart.

Pretty neat, eh?