On 28/03/07 21:49 -0500, Gopi Palaniappan wrote: > 1. Does the hardware support Voltage/Frequency scaling?
No. > 2. What kind of sleep modes does it support? Just suspend to RAM. > 3. Is there an infrastructure for power measurements? Do we have any current > drain measurements/readings? The best way to measure overall power consumption is to solder a small resistor on one of the leads from the power brick (I use a 24 milliohm resistor). Then, measure the voltage and do the math. > 4. Where are you experiencing the instability..is it at the hardware layer > or the syspend-resume mechanism? Right now it is instability in the key drivers, but we're pretty close to getting those resolved. > 5. Recently we did a lot of cleanup in the kernel to short-circuit the > default pm_suspend process, which has unnecessary layers that trumps the > suspends... the biggest one that comes to my mind is the dealing with > UNINTERRUPTIBLE SLEEP processes. I am not sure if you are experiencing > similar issues? Not right now. > 6. Is there a need for periodic wakeup? on mobile devices its required to > wakeup almost every minute to update clock display, battery level, rf > levels.it makes sense to sync up all these activities during the wakeup > period.I am not sure if a laptop has such a requirement.. We have the infrastructure to do periodic wakeups, but its not clear if those will be needed or not. Right now, we're trying to make the most stable and fastest suspend/resume that we can - we'll find good uses for a very fast suspend later. > 7. Usually display/backlight is the biggest sucker of power.. do we use any > special displays that support partial refresh? Yes. > 8. Suspend to RAM is good..it will give an "Instant-On" experience..is this > in the main kernel now or does it need special patches? If so where can i > find these patches? What we have is in the powermgmt tree in the olpc-2.6 git repository on dev.laptop.org. When we stabilize the situation, then we'll be able to provide a bit more detail. Jordan _______________________________________________ Devel mailing list Devel@laptop.org http://mailman.laptop.org/mailman/listinfo/devel
