Well, that requires software and needs to be built into the power management layer. 3.8 kernel does not have a lot of power management, but some of the newer kernels do, like 3.12. You can also do voltage and frequency scaling to lower the power, but that will also require some SW expertise..
Gerald On Mon, Nov 18, 2013 at 2:42 PM, Niko Heeren <[email protected]> wrote: > Thanks Gerald - that was quick. > > Excuse my beginner question. How exactly would I do that or where could I > learn how to do that? > I never sent any I2C command to anybody and have no clue how to ;) > > Best, Niko > > > On 18 Nov 2013, at 21:34, Gerald Coley <[email protected]> wrote: > > HDMI cannot be powered down without taking down the 1.8V rail. You > can certainly take down all the rails via the PMIC, but that may be too low > in power as that would shut everything down. > > If HDMI is not connected, no cable, the framer does go into a lower power > mode. You could also take the LCD pins and turn them off, either high or > low, to save some power as well. > > To turn ff rails, send I2C commands to the PMIC. refer to the > datasheet..But, be careful not to have devices partially powered, devcies > off and signal pins still active. > > Gerald > > > > On Mon, Nov 18, 2013 at 2:01 PM, <[email protected]> wrote: > >> Hi everybody >> >> Interesting discussion. I also would like to keep power consumption to a >> minimum for my headless BBB. >> >> @Gerald: How exactly would you power down the rails and HDMI? >> >> Best regards, >> Niko. >> >> >> >> >> On Wednesday, May 15, 2013 2:27:52 PM UTC+2, Gerald wrote: >>> >>> You can put the boar din a sleep mode depending on how much asleep you >>> want too go. You can turn of the 3.3V rail and the 1.8V rail to save power >>> by writing I2C commands to the TPS65217C.. I don't know >>> what peripherals you still want to be active so this may not work.. >>> >>> You can power down the HDMI by sending I2C commands to it, but it may or >>> may not save you the amount of power you are looking for. >>> >>> Gerald >>> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/mW_tyXJ1v4Y/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
