RE: cpufreq stops working after a while

[Carlos Garcia Campos <carlosgc@gnome.org>]

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El mar, 15-08-2006 a las 19:46 +0200, Carlos Garcia Campos escribió:
> El mar, 15-08-2006 a las 08:23 -0700, Pallipadi, Venkatesh escribió:
> >  
> > >-----Original Message-----
> > >From: Carlos Garcia Campos [mailto:carlosgc@gnome.org] 
> > >Sent: Tuesday, August 15, 2006 8:08 AM
> > >To: Pallipadi, Venkatesh
> > >Cc: cpufreq@lists.linux.org.uk
> > >Subject: RE: cpufreq stops working after a while
> > >
> > >El mar, 15-08-2006 a las 06:27 -0700, Pallipadi, Venkatesh escribió:
> > >>  
> > >> >-----Original Message-----
> > >> >From: cpufreq-bounces@lists.linux.org.uk 
> > >> >[mailto:cpufreq-bounces@lists.linux.org.uk] On Behalf Of 
> > >> >Carlos Garcia Campos
> > >> >Sent: Tuesday, August 15, 2006 4:07 AM
> > >> >To: cpufreq@lists.linux.org.uk
> > >> >Subject: Re: cpufreq stops working after a while
> > >> >
> > >> >
> > >> >I have the same problem. My laptop is Dell Latitude D600 (Intel(R)
> > >> >Pentium(R) M processor 1.60GHz). If I'm compiling something, for
> > >> >example, that takes a long time, scaling_max_freq is set to 
> > >600000 (the
> > >> >lowest). If I try to echo 1600000 to scaling_max_freq it do nothing.
> > >> >Only after some time if the cpu load is not high I can 
> > >echoing 1600000
> > >> >again and it works without need to reboot. 
> > >> >
> > >> 
> > >> Looks like you have the same problem that Mark had in this 
> > >original thread. Thermal.
> > >
> > >It never happened with older kernels (< 2.6.17, I think)
> > >
> > 
> > Can you confirm the latest version of the kernel where the problem was not there. That will help on narrowing this down.
> 
> I'm not sure at all . . . I don't have any kernel < 2.6.17 compiled
> right now.
> 
> > >> It is not a bug in cpufreq. Just that due to cpu load, 
> > >system is getting heated up and platform decides to reduce the 
> > >temperature using passive cooling and as a result reduces the 
> > >frequency. Does your system have active cooling (fans) or does 
> > >it allow only passive cooling? You can monitor the temperature 
> > >by looking at stuff under /proc/acpi/termal_zone/*/*.
> > >
> > >Yes, my system has fans. Here is the contents of the files
> > >under /proc/acpi/termal_zone/*/*, if it helps:
> > >
> > >$ cat /proc/acpi/thermal_zone/THM/*
> > ><setting not supported>
> > >cooling mode:   critical
> > ><polling disabled>
> > >state:                   ok
> > >temperature:             47 C
> > >critical (S5):           102 C
> > >
> > >How can I solve the problem then? It's very annoying. 
> > 
> > 
> > Can you watch the temperature as you see the frequency drop. Continuously (every second) cat cpufreq_max_freq in /sys and temperature in /proc as you run you load. My feeling is you will see the drop in max freq as your temperature goes to around 60 degrees or so.
> 
> Here are the results:
> 
> ................
> 1600000 - 85 C
> 1600000 - 84 C
> 1600000 - 85 C
> 1600000 - 76 C
> 600000 - 76 C
> 600000 - 71 C
> 600000 - 70 C
> 600000 - 69 C
> ................
> 
> It changed at 76 C.

I forgot to mention that if I boot from battery scaling_max_freq is set
to 600000 and I have to echo 1600000. At boot time temperature is not
high so I'm not sure it's a thermal problem, or at least not only a
thermal problem. 

> > 
> > Thanks,
> > Venki
> > 

Thanks a lot for your help,
-- 
Carlos Garcia Campos (KaL)
   elkalmail@yahoo.es
   carlosgc@gnome.org
   http://carlosgc.linups.org
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462

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