Power

D0, Device power state, equivalent to “fully on”. D1 and D2 are intermediate states; D3 is “Off”

S0ix, An “active idle” sleep state, which delivers the same power consumption as S3 sleep, yet provides a quick activate time into full S0 state

Links

Kernel Integration

    root@edison:~# rfkill block Bluetooth # BlueTooth

    root@edison:~# modprobe -r bcm4334x # WiFi
    root@edison:~# modprobe bcm4334x # WiFi

    root@edison:~# /sbin/iwconfig wlan0 power off
    root@edison:~# /sbin/iwconfig wlan0 power on 

    root@edison:~# cat /sys/power/state 
    freeze mem
    root@edison:~# cat /sys/power/pm_test
    [none] core processors platform devices freezer

    root@edison:~# echo 1 > /sys/devices/system/cpu/offline 

    root@edison:~# ls /sys/power/
    pm_async           pm_print_times     state              wake_unlock
    pm_freeze_timeout  pm_test            wake_lock          wakeup_count
    root@edison:~# cat /sys/devices/system/cpu/     
    cpu0/       cpuidle/    offline     power/      release     
    cpu1/       kernel_max  online      present     uevent      
    cpufreq/    modalias    possible    probe
    root@edison:~# ls /sys/devices/system/cpu/cpu0/cpufreq/                         
    affected_cpus                  scaling_cur_freq
    cpuinfo_cur_freq               scaling_driver
    cpuinfo_max_freq               scaling_governor
    cpuinfo_min_freq               scaling_max_freq
    cpuinfo_transition_latency     scaling_min_freq
    related_cpus                   scaling_setspeed
    scaling_available_frequencies  stats
    scaling_available_governors
    root@edison:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
    ondemand userspace performance
    root@edison:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
    500000
```sh

### Suspend to Ram, Yocto BSP Edison 3.0

```sh
root@edison:~# echo mem > /sys/power/state 
[   64.899755] intel_scu_watchdog_evo: watchdog_stop
root@edison:~# echo mem > /sys/power/state 
[   72.953877] intel_scu_watchdog_evo: watchdog_stop

Failure under some specific condition

Suspend to Ram, Yocto BSP Edison 2.1

Userspace Applications

SystemCtl, Yocto BSP Edison 3.0

From ArchLinux SystemD

Setup

Opkg

Apt-Get

Device Configuration

Usage Models

Links

Suspend Issue

In the latest Yocto release (2.1 from 09/28/15), there is a problem when trying to put asleep the edison board. The commands to put the edison board in S3 state are:

But this only works the first time after a reboot. The patch involves modifying two lines of code from intel_soc_pmu.c file from the linux kernel:

https://github.com/01org/edison-linux/commit/149de7abd8829bcc009641e215b53fe89fcf29b2

Assuming you have a working yocto build environment (Check Edison BSP instructions for this), the file is on the following path:

Then we need to recompile and rebuild the image:

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