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am335xevm_sk Screen not turning off when suspending

Hello,

I'd like to test the power management features of Android on the am335xevm_sk, so I did the steps:

- Allow screen timeout in developer settings
- echo usb_connected > sys/power/wake_unlock        //disable the usb wakelock
- setprop hw.nopm false                                                     //enable power management 

Now the device will suspend as seen in the console, however the screen doesn't turn off or the backlight. I can see that the device is suspending - when it suspends, the clock stops updating, and when the device is woken again by a touch on the screen, the device resumes and the clock is then updated.

My question is, why does the screen/backlight not turn off? Can someone please point me in the right direction?

Many Thanks

Richard