root@am437x-evm:/# uname -a Linux am437x-evm 4.19.94-gbe5389fd85 #1 PREEMPT Mon Apr 20 02:19:56 UTC 2020 armv7l GNU/Linux root@am437x-evm:/# echo mem > /sys/power/state [ 396.954347] PM: suspend entry (deep) [ 396.957975] PM: Syncing filesystems ... done. [ 396.982908] Freezing user space processes ... (elapsed 0.003 seconds) done. [ 396.993507] OOM killer disabled. [ 396.996900] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. [ 397.005962] Suspending console(s) (use no_console_suspend to debug) [ 397.066038] GIC and Wakeupgen context save failed [ 397.066038] pm33xx pm33xx: PM: Successfully put all powerdomains to target state [ 397.066038] PM: Wakeup source UART [ 397.089665] net eth0: initializing cpsw version 1.15 (0) [ 397.091110] libphy: PHY 4a101000.mdio:00 not found [ 397.091132] net eth0: phy "4a101000.mdio:00" not found on slave 0, err -19 [ 397.134343] usb usb1: root hub lost power or was reset [ 397.134368] usb usb2: root hub lost power or was reset [ 397.301277] OOM killer enabled. [ 397.304466] Restarting tasks ... done. [ 397.337503] PM: suspend exit root@am437x-evm:/#