This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Linux/AM5728: Suspend mode still uses a lot of power

Part Number: AM5728

Tool/software: Linux

Running using the AM5728 EVM, without the LCD board attached.  When running normally, I measure current on PS_3V3 as 2.1V.  However, when I put the unit into suspend mode, it's still drawing 1.2A!

The console looks like this for the suspend and restore:

root@am57xx-evm:~# echo mem > /sys/power/state

[ 200.800039] PM: suspend entry (deep)

[ 200.803636] PM: Syncing filesystems ... done.

[ 200.864317] Freezing user space processes ... (elapsed 0.001 seconds) done.

[ 200.872718] OOM killer disabled.

[ 200.875956] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.

[ 200.884573] Suspending console(s) (use no_console_suspend to debug)

 

... wake using console …

 

[ 201.090672] rtc-ds1307 2-006f: read: 91 44 02 2a 11 02 19

[ 201.090682] rtc-ds1307 2-006f: read secs=11, mins=44, hours=2, mday=11, mon=1, year=119, wday=1

[ 201.144687] Disabling non-boot CPUs ...

[ 201.190836] Successfully put all powerdomains to target state

[ 201.190882] Enabling non-boot CPUs ...

[ 201.190950] CPU1: smp_ops.cpu_die() returned, trying to resuscitate

[ 201.191281] CPU1 is up

[ 201.194551] omap-iommu 58882000.mmu: 58882000.mmu: version 2.1

[ 201.198908] net eth0: initializing cpsw version 1.15 (0)

[ 201.320401] Micrel KSZ9031 Gigabit PHY 48485000.mdio:01: attached PHY driver [Micrel KSZ9031 Gigabit PHY] (mii_bus:phy_addr=48485000.mdio:01, irq=POLL)

[ 201.322394] cpts ptp bc clkid 0

[ 201.531347] ata1: SATA link down (SStatus 0 SControl 300)

[ 201.725938] usb 1-1: reset high-speed USB device number 2 using xhci-hcd

[ 202.148979] OOM killer enabled.

[ 202.152142] Restarting tasks ... done.

[ 202.172607] PM: suspend exit

root@am57xx-evm:~#

Obviously I must be doing something wrong.  Any good ideas on how to work out what?

Best regards,

Bob.