Ubuntu

Fan running all the time on a laptop with dapper

Asked by bigjoe

I have read several user reports about their laptop fan running all the time under dapper drake. I have the same problem, however, I'd rather see that as a configuration mistake than a bug in ubuntu.
According to lm-sensors, the temperature for the fan to start working is 45 C which is fine. However, after this has happened, the temperature value change to 35 C for the fan to stop, which, at least with my laptop, is an impossible thing. My cpu's standard temperature (running idle, word processing etc.) is about 40 C (no matter if I work in windows or linux it's both the same temperature readings) and even in the cool basement the fan will not get it below 37 C.
The point is, that 35 C is an unnecessarily low temperature value. The centrino is able to handle temperatures about 10 degrees higher without any need to run the fans so the only thing to do would be to change this one value to a temperature about 40 C.

Especially during the bootup it is easy to check the behavior, because while loading gnome, the cpu runs at 1,5 GHz and easily surpasses the 45 C, once gnome is done loading, the cpu goes down to 600 MHz and the temperature goes down below 35C for a while. At this point, while the fan started working above 45 C it stopped when the temperature dropped to 35 C.

I have tried to change this setting via the DSDT but somehow the edited one was not included in the initrd, the values remained the old ones.

I don't know if it's possible, but I would very much appreciate a change of this value, which I believe would also solve the other folks' fan problems. Is it possible to distribute it via the autoupdate?
By the way, I have been using breezy for quite a long time and did not have any similar problems.

My laptop:
Samsung P30 XVM1500
Centrino (Banias) 1,5 GHz
Radeon 9200
Dapper Drake

Thanks for help in advance !

Question information

Language:
English Edit question
Status:
Answered
For:
Ubuntu Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:
Revision history for this message
Benjamin Hodgetts (enverex) said : 		#1

I have this same issue, within a few minutes of my laptop being turned on (Sager 5660) the super fan turns on and STAYS on which makes it loud as hell and it doesn't turn off, where as in Windows it is fine. It makes me wonder if it is related to the APM idle call not being made or some sort of customised fan control taking over.

Revision history for this message
bigjoe (bigjoe087) said : 		#2

At least in my case I don't think it's about an idle call, because as I wrote, if the temperature drops below the set temperature limits the fan goes off, no matter whether I am working with the laptop or it's running idle. It's just impossible to reach the minimum limits after the fan has been started ... I might succeed in winter outside ;)

Revision history for this message
Bono Lv (bonolv) said : 		#3

In my asus laptop. pm1.7 ,intel 82855, ati 9700 mobility . The fan
could stop ,, but too short time then I expect. ... could i alter up the fan start temperature. ?

Revision history for this message
Zigui (26173) said : 		#4

i have the same problem too.
I have an ACER Aspire 1692lmi, 1.73GHz, the fan stop but for a short time and then put the power on and i have to wait more tan 30 minutes for goes down again with temperatures about 37-40'C.
i can not read the values off the fan because my lmsensors doesn't work with the fan, only with the hard drive and cpu and i don't Know why.

Can you help with this problem?

Provide an answer of your own, or ask bigjoe for more information if necessary.

To post a message you must log in.