Hi, On Sunday, 19 August 2007 15:32, Jean Delvare wrote: > Hi all, hi Rafael, > > Running kernel 2.6.23-rc3-git1, I noticed yesterday that my CPU (AMD > Sempron 2600+) was running at a much lower temperature when > CONFIG_SUSPEND was enabled.
Hm, interesting. > The temperature difference was quite significant, about 6 degrees Celsius at > idle. Measuring the power consumption of my system confirmed that the energy > savings were real: with CONFIG_SUSPEND=n, the system consumes 80 W of power > (idle), while with CONFIG_SUSPEND=y, the system consumes only 69 W (idle)! > Can anyone explain how this works? I can't. > I didn't expect CONFIG_SUSPEND to make any difference before actually > switching the system to standby or suspend state. Yes, that's the expected behavior. > I tried the same trick on two Intel motherboards I use for testing, but > this option didn't seem to make any difference in the power consumption > for these. Do you have CONFIG_HIBERNATION set? If not, please see if setting it instead of CONFIG_SUSPEND leads to the same result on the affected box (ie. running at lower temperatures). Greetings, Rafael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/