Sheer El-Showk wrote: > I wrote my last email before seeing this response of yours. Perhaps > this result of yours verifies Marios hypothesis that OS X configures > the SMC at boot time and then just leaves it that way. When you say > booted OS X and then returned to Linux did you mean started OS X and > then rebooted into linux or switched off and then returned to Linux?
You can do a really simple experiment about that. On Linux, or OS X, set the minimum fans speed to 5000 RPM (using applesmc or smcfancontrol), to make sure you hear them. Then reboot, either on Linux or OS X, are the fans still running at 5000 RPM? If not, it would very likely mean there is no persistence. If yes, then it'll mean that there is some persistance Another thing to consider about plotting fan/temperature diagrams: In my opinion, they will be the same, for this physical reason: The fans are used to cool down your computer. So, if, on OS X, a special trick was used to prevent the fans from turning on when the temperature increases, the laptop would become hotter, right? Is that happening? No. The laptop is hotter on Linux, and the fans turn at higher speed. Also, another thing to consider is that there is probably a threshold temperature for the fans to start, let's say, to illustrate, 50°. We know that the temperature with an idle computer is lower on OS X (using my hands I can feel it), so this idle temperature is maybe 40°, while on Linux it might me 49°. It means that for the fans to turn on on OS X, you'll need a heavy a long-lasting CPU/GPU load, as you need to gain 10°, while on Linux you only need to gain 1° (moving a window in Xgl might already be too much...). About the fact that after rebooting from OS X, the fans are quieter, is this a permanent effect? Wouldn't it be the same effect with a cold boot? (i.e. with a cold laptop) I'm not saying there is no black magic in SMC, after all, why not. But, for now, I don't really think we need that to explain the difference in behaviour between OS X and Linux. Best regards, Nicolas ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Mactel-linux-users mailing list Mactel-linux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mactel-linux-users
