Aspire E1-571, V3-571 or related model owners - how is your CPU fan?

I don't use mine very often. At the start of the year I noticed the fan CPU wasn't spinning, and my temps are hitting around 90 on idle.

Thing is, the fan spins perfectly when in the BIOS (either legacy or UEFI), and carries on spinning until the temps are more acceptable. It's only once Windows takes over that the fan either stops spinning or slows down to its lowest level, and will not speed up at all regardless of how hot the CPU is.

This makes me think it isn't a hardware problem, and Acer might have messed something up in the BIOS - it looks like the fan controller in Windows isn't communicating properly with the firmware. Searching, I've found one post on a forum somewhere from someone else having the same problem. Acer's support forum was no help at all.

I've tested this out on both W7 & W8.1, all drivers installed. Same behaviour on both, doesn't matter if it's a UEFI or Legacy install. As soon as Windows starts booting the fan shuts down. I've tried a few different versions of 2.x BIOS with no luck, and I'm unable to install the 1.x versions as you apparently can't go from one to the other.

Can anyone verify if they have a working fan, and which BIOS version they have?

 

There is no fan controller in Windows at all, this is entirely hardware dependent. There is a table that defines what rpm the fan should work in given temp range.
Can you boot the system from USB thumb-drive running Ubuntu and see what happens then?

 

Just tried running a Mint live USB. Once again, fan span down as soon as the OS took over.

Tried DOS too. Unsurprisingly, runs just like the BIOS does - fan stays on until the CPU is at a reasonable temperature.

 

I have a E1-571, BIOS v2.18. the fan works fine, it could be your fan failing, it's not very expensive, while you change the fan repaste the CPU as well.
http://www.ebay.co.uk/itm/Genuine-N...71G-V3-571G-Series-Cpu-Fan-DC5V-/300905912524