It seems nVidia deliberately set the 177+ drivers to run the fans at
full speed, avoiding the notorious potential overheating problems of
this series of graphics cards. Updating to to the latest BIOS (on the
D630, A12+) makes this "hack" go away, but makes still the fans run
constantly at low speed (say, 25%). This decreases the odds of a
hardware failure, in the worst case causing it to fail somewhere outside
your warranty period. It also leaves you with additional noise and lower
battery life.

I currently have a A13 BIOS (not to my doing); has anyone tried
downgrading theirs to a version before the "Enhancement for thermal
control" was introduced to the BIOS? Personally, I prefer having a low-
noise laptop, with better battery life, even if I run a small risk of
overheating. (With Dell replacing it in the next business day if
anything happens.)

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nvidia graphics driver 177.80 on geforce 8400 makes fan spin all the time
https://bugs.launchpad.net/bugs/280805
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