Comment 21 for bug 48395

Ühel kenal päeval, T, 2006-10-31 kell 22:16, kirjutas Stephen Irons:
> The same 99% CPU, fans full-speed problem occurs on my Dell Inspiron
> 6400 running Dapper with all updates.
>
> I have noticed that the problem is much worse during cold weather. On
> winter morning, the room temperature was below 5C, and the problem would
> happen every time it started. If I turned turned the machine off as soon
> as possible, then back on, it would still run at 99% CPU. If I left the
> thing running for a few minutes before rebooting the problem would go
> away and everything would start normally: I assume that things had
> warmed up internally.
>
> Now that it is spring in the southern hemisphere, the system usually
> starts up reliably except on very cold mornings, and the same trick
> works.
>
> Perhaps there is something wrong with the temperature detection (it
> interprets the very cold temperature as very hot), though I have no idea
> how that might make ipw3945 run at full-tick.
>
> One other point is that the fans turn on very early on in the boot
> process---after grub, after the splash screen appears, but before the
> first line of text.
>
> Stephen
>

Hi,

I may have a solution to this nasty problem
http://bordeaux.freshrpms.net/rpm.html?id=1044 and from there you should
go to http://bughost.org/ipw3945/
I've not been able to monitor the activity of my laptop's CPUs after
taking the steps which are described in the bugshot page, but it seems
to me that the fan does not work as hard anymore as it used to.
What you say about cold wheather is interesting. I am not sure, but it
seems to me that the fan stops spinning so much when acpi -t gives about
49-51 C

PS applying the firmware and daemon updates may cause that you have to
load the module and the daemon manually after resuming from suspend or
hibernate but as that can be done with two simple commands it should not
be much of a trouble.