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Old 05-25-2016, 03:14 PM   #5
knc1
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Posts: 17,212
Karma: 18210797
Join Date: Feb 2012
Location: Central Texas
Device: No K1, PW2, KV, KOA
Quote:
Originally Posted by Vladi69 View Post
Ok, but in this way no screen off. DO you mean this is not useful? So why the option exist?
To differentate between a semi-long press to put the device to sleep and a very long press to restart the device.
(At least the pop-up panels I have seen give you more than one action to choose.)

The device will show a screen saver, and after a time period (if it has nothing to do) will go to sleep (and turn off the front light).

Note:
The Kindle's never go to sleep if you have something holding a "wake lock" in the system -
such as having the USB cable plugged in.
Although they will be showing a screensaver - even when kept awake by a 'wake lock'.

OR:

echo 'mem' >/sys/power/state
OR
echo 'standby' >/sys/power/state (does what it says -> everything possible is turned off or put to sleep - takes a few 1/10s of a second).

There is a recent thread here about giving ;log (a search bar command) a new meaning.
See the 'Hide books' thread and example scripts.

After you decide which state you want to enter - re-write the ;log script to match.

Edit:
Is it 'safe' to just poke power management?
Code:
[728133.980625] PM: Syncing filesystems ... done.
[728133.993436] PM: Preparing system for standby sleep
[728133.994245] Freezing user space processes ... (elapsed 0.02 seconds) done.
[728134.015707] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
[728134.035692] PM: Entering standby sleep
[728134.035701] Suspending console(s) (use no_console_suspend to debug)
[728134.117192] udc suspend begins
[728134.117715] USB Gadget suspend ends
[728134.117858] KERNEL: I pmic:fg suspend battinfo:current=0mA, volt=4200mV, capav=100%, mAh=1464mAh:
[728134.136500] add wake up source irq 105
[728134.139261] add wake up source irq 51
[728134.139320] PM: suspend of devices complete after 103.192 msecs
[728134.139688] PM: late suspend of devices complete after 0.350 msecs
Ans: Yes
That is everything required to put the device to sleep.
Note that the battery current is shown a zero - that is only because it is too low to measure for the Kindle's current sensor.

The dynamic ram is in low power, self refresh mode -
There is a micro-controller running (clock, button, hall effect monitoring) -
As much as possible of the SoC (and cpu) has clocks and power removed.

This is about as close to 'off' as a Kindle can get without removing the battery.

Last edited by knc1; 05-27-2016 at 09:51 AM.
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