Suspend to RAM¶

This state offers significant power savings as everything in the system is put into a low-power state, except for memory, which is placed into the self-refresh mode to retain its contents.

To suspend to RAM, run:

# pm-suspend

Wake up¶

There are many possible ways to wake up from suspend.
A few examples:
- Pushing the ON/OFF button (when present on the board)
- Pushing a button on the board which has the boolean property "gpio-key,wakeup" set in its device tree node (under gpio_keys), e.g.:

    gpio-keys {
        compatible = "gpio-keys";
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_gpio_keys>;

        back {
            label = "Back";
            gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
            linux,code = <KEY_BACK>;
            gpio-key,wakeup;
        };
    };

Using the RTC you can wake at a specific time. See the RTC guide for more information.

Current consumption when suspended¶

VAR-SOM-MX6 "L" revisions (1GB RAM)¶

17.2mA with a 3.7V Li-Po

Warning: Only "L" (for Low-power) revisions of VAR-SOM-MX6 can be operated at 3.7V!

DART-MX6¶

9mA with a 3.7V Li-Po

VAR-DART-6UL¶

4.5mA at 3.3V

VAR-SOM-MX7¶

Transistor Q1 should be shorted in order to measure the sleep current correctly. Please check out the CustomBoard schematics for additional information.