Low Power mode in Android

amit251291 — Fri, 03 Aug 2018 11:27:50 GMT

Hi,

We are using sabresd board running with Android 7.1.2

I want to enter into "Low power mode" using echo mem > /sys/power/state. But it fails.

Below is the log:

/ # echo mem > /sys/power/state
PM: suspend entry 1970-01-01 03:32:02.891862744 UTC
PM: Syncing filesystems ... mmc0: Switching to 3.3V signalling voltage failed
done.
Freezing user space processes ... (elapsed 0.002 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
sd 0:0:0:0: [sda] Synchronizing SCSI cache
sd 0:0:0:0: [sda] Stopping disk
mmc1: Switching to 3.3V signalling voltage failed
PM: suspend of devices complete after 83.607 msecs
PM: suspend devices took 0.090 seconds
PM: late suspend of devices complete after 1.593 msecs
PM: noirq resume of devices complete after 0.324 msecs
PM: noirq suspend of devices failed
PM: early resume of devices complete after 1.088 msecs
mmc1: Switching to 3.3V signalling voltage failed
mmc0: Switching to 3.3V signalling voltage failed
sd 0:0:0:0: [sda] Starting disk
PM: resume of devices complete after 85.463 msecs
PM: resume devices took 0.090 seconds
android_work: sent uevent USB_STATE=DISCONNECTED
Restarting tasks ... done.
mmc1: Switching to 3.3V signalling voltage failed
PM: suspend exit 1970-01-01 03:32:03.640829411 UTC
1|toradex_apalis6q:/ # android_work: sent uevent USB_STATE=CONNECTED
configfs-gadget gadget: high-speed config #1: b
android_work: sent uevent USB_STATE=CONFIGURED
mtp_open
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: configured for UDMA/133
sda: detected capacity change from 0 to 16013942784

am i doing it in correct way ? Why does it fail ? How to enter to low power mode ? and also resume back ?

Re: Low Power mode in Android

diegoadrian — Fri, 10 Aug 2018 21:24:10 GMT

Hello,

You can try using the below adb command to put your Android device in sleep mode:

adb shell svc power stayon false

Hope this can solve your problem.

Best Regards,

Diego.

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Low Power mode in Android

Re: Low Power mode in Android