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" <[EMAIL PROTECTED]> 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 > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > > 人山人海盛景，尽在梦幻西游
