Comment 8 for bug 138322

Interesting - yes model=auto works great and removing the model= altogether goes back to being broken.

(Hint: If you are doing this test by modprobe'ing the module back in remember to remove the option entry
you added to the modprobe.d ! It fooled me the first few times!)

Does that mean there is something overriding the default auto behaviour?

For reference the laptop is a Toshiba Equium A100-306; I've attached the output of dmidecode;
it really looks like it is an Intel reference design tweaked (I love the fun bits left in like the 52U enclosure and 18 power cords - a bit excessive for a laptop).