high cpu temp and fan speed problem

[Alexandre "Sunny" Kovalenko]

On Mon, 2010-05-10 at 02:23 +1000, Ian Smith wrote:
> Nathan, I replied without noticing that you had not copied the list; I 
> don't mind direct replies, but please keep the list in the ccs.
> 
> On Sun, 9 May 2010, Nathan BIAGINI wrote:
>  > 2010/5/9 Ian Smith <smithi at nimnet.asn.au>
>  > 
>  > > On Sun, 9 May 2010, Nathan BIAGINI wrote:
>  > >  > Hi,
>  > >  >
>  > >  > i bought a hp pavilion dv6-1123ef laptop and i've installed FreeBSD 8.0
>  > > on
>  > >  > it. Everything work except one think : i can't do high-cpu task. The
>  > > problem
>  > >  > is when i run a high-cpu task (no very high in fact), my cpu temperature
>  > > can
>  > >  > increase to 90°C and when it's the case, system go down. Further, i
>  > > heard
>  > >  > the fans are running. When i work on windows (short time), i never had
>  > > this
>  > >  > kind of problem so i think is may be a kernel config problem.
>  > >
>  > > Sounds perhaps similar to some recent issues, but first we need to know
>  > > more about your laptop .. please show output of:
>  > >
>  > > % sysctl hw.acpi
>  > > % sysctl dev.cpu
>  > > % grep -i acpi /var/run/dmesg.boot
> 
> Sorry, my 8.0 laptop is memtesting new RAM today so I didn't check that. 
> Still need to know what make/model CPU it has, and what cpufreq drivers 
> it uses .. can you post the whole dmesg.boot ? (just plain, not verbose)
> 
>  > >  > I precise that when i want to run mbmon to minitor cpu temp and fan
>  > > speed
>  > >  > (compiled form the ports), it return an unknow error like what no
>  > > hardware
>  > >  > monitor is found, the cause of my problem?
>  > >
>  > > mbmon only works with some hardware, and then needs tweaking sometimes;
>  > > worry about that if it doesn't look like an acpi and/or cpufreq issue.
>  > >
>  > > Temperature at least should be shown by sysctl dev.cpu.N.temperature.
> 
> Oops again - that should say hw.acpi.tz0.temperature (as below)
> 
>  > Thanks for your help. I'm new in the world of UNIX and FreeBSD ;)
>  > 
>  > I've joined the outputs of the commands in this message.
> 
> Ok.  If things aren't too big they're perhaps better posted inline, so 
> I'll quote a few bits that look a bit strange regarding temperatures:
> 
>  > acpi_tz0: _CRT value is absurd, ignored (-273.2C)
Looks like _CRT returns 1 (one), which, definitely, is absurd. Nathan,
you can dump your ASL (read instructions in the handbook) and post it
somewhere for people to look at. 

I would suggest you give some thought to the fact that changes to ASL,
even well intentioned ones, could, theoretically, damage your hardware,
so if you are not willing to make changes and override ASL on boot, most
of this is an academic exercise, and could be skipped altogether. 

Now, I have done it [overriding ASL] in the past to my own hardware and
know few other people who have done it with the positive results, but
this is your choice and you need to go into it with your eyes open.

Additional information could be found in the thermal chapter of the ACPI
specification, which could be be read separately and has very useful and
well-commented example.

-- 
Alexandre Kovalenko (Олександр Коваленко)



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