Hi all, I have a few questions about PM functionality I would be grateful if someone could answer. I'm trying to reduce power on a gumstix overo COM with the latest 2.6.38 pm kernel branch up and running, I've enabled sleep while idle and "off" mode along with serial timeouts and I do in fact see a major drop in power consumption when it hits idle/off mode. 1) Should the "mem" power state reduce power further? Or does that simply force the omap into the same states achieved by sleep while idle and off mode enabled? I'm not seeing any less power in "mem" state versus idle/off state. 2) I saw from earlier emails that DVFS is currently disabled. Would I see any power additional power savings with DVFS? Obviously, power would be reduced if I ran a governor such as on demand so that waking up from idle doesn't use full speed unless needed. Are there any other benefits? Should I wait for DVFS to be merged back in to PM or apply the patches that are waiting for approval? 3) Are peripherals such as SPI, I2C, etc disabled when in idle/off mode? I'm coming from a microcontroller background where disabling unused peripherals can save power. Is that true for the omap? 4) Any additional power saving tips? I have PHY_PWR_CTRL disabled and I assume there are more steps I can take to disable unneeded functions on the PMIC but I have not gotten far yet. Thanks for any help! Marshall -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
