Re: Powerbook 12" 1.5 GHz, therm_adt746x, thermal issues
Andreas,
I am having the same problem with this laptop(mine is 1.33GHz). A walk around solution will be to slow down the cpu speed.
(root or using sudo) echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
In my case this CPU speed will be halved which is 0.66Ghz. It's not a good solution but the laptop didn't shutdown anymore for overheat.
I hope someone could provide a better solution.
thx
Jones
<br><br><br><br><br><br><br>
----原邮件内容如下----
发件人："Andreas Schreiner" <andreas.schreiner@sonnenmulde.at>
收件人："ppc debian" <debian-powerpc@lists.debian.org>
日期：Thu, 24 May 2007 05:09:43 +0800 (CST)
主题：Powerbook 12" 1.5 GHz, therm_adt746x, thermal issues
> Hi!
>
> I am experiencing heat-caused shutdowns on a PowerBook 12" 1.5 Ghz
> (the last 12" PowerBook
> model with USB Trackpad and Keyboard) when it is under heavy load and
> especially when the Harddisk is
> busy (I have replaced the standard HD with an presumably hotter
> running 7200rpm drive)
>
> The machine currently runs Debian Testing (Lenny). I have done some
> experiments with the options from the
> "therm_adt746x" module but with not much success yet. Setting the
> "limit_adjust" option seems to effect when
> the fan kicks in (default is 50 Celsius) and the "fan_speed" option
> seems to be responsible for the initial (or
> minimum) speed of the fan when it kicks in.
>
> I am monitoring the temperatures of CPU and GPU as well as the fan
> speed while running a CPU and HD
> intense task on the PowerBook. The fan is always running at top
> speeds when the CPU reaches around 60
> Celsius, so everything seems to be alright there. When the CPU temp
> stays above 70-72 Celsius for some
> time the Powerbook just stops hard.
>
> Now, when I remove the "therm_adt746x" module I get a pretty similar
> behaviour in therms of fan management.
> The fan seems to kick in a little earlier (maybe comparable to when
> using the "limit_ajdust=-7" option) but there
> seems to be no temperature shutdown limit (or at least a very high
> one). In fact withouth the "therm_adt746x"
> module, fan management seems to be exactly like under OS X - how is
> this possible? Is it done by the Hardware?
> What is the "therm_adt746x" module for then?
>
> I have also looked into the "linux-source/drivers/macintosh/
> therm_adt74x" source and found some temperature
> limits there but I am not sure wicht ones are responsible for what.
> So i did not want to change anything and risk
> ruining the PowerBook due to overheating.
>
> I had the same PowerBook running under MacOS X where the CPU
> temperature topped out at around 69 Celsius.
> I am aware that the sensors might not give exact values but still
> they should be identical under OS X and Linux. Is Linux
> just running hotter or does the MacOS simply not care about the heat
> as much and just not shut down the PowerBook at
> about 70 Celsius. Just as I said - i never saw temperatures above 70
> Celsius under OS X - i observed about 76 Celsius
> when i run under Linux without the "therm_adt746x" module for a while
> (then modprobed it in and fetched the temp
> from "/sys/devices/temperatures/)"
>
> What I would like to do now is the following: having the fan kick in
> quite early and with low speed, increasing the speed
> when the temperature gets higher. And i would definitely like to
> increase the shutdown temperature limit. Where is this
> set and how can I alter the setting? How high could I go with the
> limit without killing the PowerBook.
>
> The goal is of course preventing the hard stops because it is rather
> annoying when it does i during a rsync backup
> to an external Firewire HD for example (and it does this right now...)
>
> I would appreciate to hear any help, suggestions or experiences with
> this kind of problem!
>
> Regards,
> Andreas Schreiner
>
>
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