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.

Note: by default power button on XFCE environment issues shutdown via logind.
if you want power key to be ignored by XFCE logind use below commands,

# sed -i 's/#HandlePowerKey=poweroff/HandlePowerKey=ignore/g' /etc/systemd/logind.conf'
# systemctl restart systemd-logind

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 section)

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.

IMX suspend Debian MX7

Suspend to RAM

Wake up

VAR-SOM-MX7