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FS#39005 - [linux] Strange / dangerous fan policy since Linux 3.13.4

Attached to Project: Arch Linux
Opened by Rok kralj (technolog) - Sunday, 23 February 2014, 09:01 GMT
Last edited by Tobias Powalowski (tpowa) - Monday, 16 June 2014, 18:44 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To Tobias Powalowski (tpowa)
Thomas B├Ąchler (brain0)
Architecture x86_64
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 3
Private No


My fans are acting strangely since yesterday's upgrade.

Behaviour on 3.12:

Fans running pretty much all the time on 30%, temperatures 30-40 C.

Behaviour on 3.13:

Fans are idle until temperatures rise to 84 C (this is hot!), then ramp up to 75% for a few seconds until temperatures drop to 72 C. Then they idle again.

This seems pretty dangerous, because the threshold of 84 degrees is just too high. I'd be fine with 60.

Laptop: HP ProBook 4510s
This task depends upon

Closed by  Tobias Powalowski (tpowa)
Monday, 16 June 2014, 18:44 GMT
Reason for closing:  Upstream
Comment by step-2 (step-2) - Wednesday, 05 March 2014, 02:38 GMT
Same thing with 3.13.5

fans don't kick in until 80 c , and ramp up (noisy)

Laptop: mackbook air 2013
Comment by Daniel Micay (thestinger) - Wednesday, 05 March 2014, 02:49 GMT
Is this reported upstream? It's very unlikely that this is a packaging bug.
Comment by step-2 (step-2) - Wednesday, 05 March 2014, 02:54 GMT
it's happening on linux-ck also , so don't think it's a packaging bug ,

don't know if someone reported it .
Comment by Daniel Micay (thestinger) - Wednesday, 05 March 2014, 15:51 GMT
If it's not reported upstream, it's not going to get fixed.
Comment by Rok kralj (technolog) - Friday, 07 March 2014, 14:37 GMT
Meanwhile, I have gotten used to it. The laptop can stay quiet for 10 minutes and after that, just 10 seconds of fan activity. I have to say I like a policy like this more, so, maybe, this behavior is intentional.

Except the occasional smell of burnt plastic and 1/2 of a normal battery life.

TL;DR: I am not sure this is even a bug.
Comment by Daniel Micay (thestinger) - Friday, 07 March 2014, 15:51 GMT
Do you plan on reporting it to the bugzilla?
Comment by Guenter Roeck (groeck) - Friday, 07 March 2014, 21:17 GMT
I don't immediately recall a change in the hp or apple drivers for 3.13.

Some additional information might be helpful.

Do you run the fancontrol script, do you rely on automatic fan speed control, or do you have some other means to control the fan speed (and thus the system temperature) ?

What is the output you get with the "sensors" command, and did it change since 3.12 ?

Do you see anything notable in the kernel log ?
Comment by step-2 (step-2) - Saturday, 08 March 2014, 05:10 GMT
reported it :

hope someone respond ;)