Standby and sleep modes in a mobile phone -


consider below case.

1) mobile phone booted. @ moment can said in run mode power consumption more.
2) if no activity done, after sometime screen goes dim.
3) after further inactivity, screen goes off.

a) question is, can mobile phone in standby mode , sleep mode in above steps 2 , 3 respectively?

another question is, suppose playing music , leave mobile sometime. in case mobile phone goes through 2 , 3 steps mentioned above. difference earlier scenario music being played in second scenario. in case, can mobile phone in standby , sleep mode respectively in 2 & 3 steps when music being played.

if no activity there linux, cpuidle threads gets scheduled scheduler least priority process , brings cpu various low power states, other peripheral governed various other concepts of os. if screen goes dim can lead 2 possibilities :

  1. partial wake load , system down (some power save)
  2. linux suspend called (echo mem > /sys/power/stae) , full device suspended, (huge power saves, ddr active in self refreshing mode along on module) seeing cant in sleep or suspend mode, if touch or activity other register wake event brings screen up, device in sleep mode not suspend mode. wake events "power on key", alarm, network packet (ie call or message etc)

and second part of question, belongs low power audio concept, varies alot device architecture. common in android phones putting cpu in 'low power state' , periodically waking them copy music data dma, can played.

there many concepts used in scenario have used varies os , architecture , application, have tried best give bird's eye view.


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