PINE64
Auto-wake behavior when external power is connected - Printable Version

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+--- Thread: Auto-wake behavior when external power is connected (/showthread.php?tid=8211)



Auto-wake behavior when external power is connected - diodelass - 11-05-2019

I've noticed that my Pinebook Pro immediately wakes up from a suspend-to-RAM state whenever external power is connected or disconnected. I find this concerning, because this is approximately the last time I would ever want it to wake from sleep mode automatically - particularly since it does this even if the lid is closed at the time, and it's very hard to tell from the outside if the device is asleep or awake with the lid down.

What will it take to change this? I'm bracing myself for the worst, because I can't imagine the OS is involved at all in wake conditions - hence my posting in the hardware section. Is this something that could be fixed in the firmware with a straightforward method, or is it going to require attaching debugging clips to an IC in there somewhere, or what?

It's puzzling to me how this behavior was established in the first place. Is it affecting other units as well, or is ours somehow a fluke?


RE: Auto-wake behavior when external power is connected - sundog - 11-05-2019

Just confirmed that our pinebook pro exhibits the same behavior running ayufan's bionic lxde image 0.9.16 using the barrel connector for power.

Also agree that this is sub-optimal.


RE: Auto-wake behavior when external power is connected - diodelass - 11-08-2019

After having dealt with it for a couple days, this behavior is driving me mad. I can't close the lid and then put it on its charger, because connecting the charger immediately wakes it up. I can't unplug it and stuff it into a backpack, either, because that wakes it up too. If the power flickers in the night, it wakes up. If I jostle the cord by accident and it momentarily loses contact, it wakes up. It's kind of absurd.

Can anyone familiar with the hardware tell us more about why this happens, and perhaps how it might be fixed? Keeping my computers asleep until I purposefully wake them is a rather important part of my use of them.


RE: Auto-wake behavior when external power is connected - xalius - 11-08-2019

If I had to guess, I would say it's the PMIC interrupt from the RK808 that notifies the OS of a power management event:

15.2.5.4 INT_STS_MSK_REG2 : Interrupt Status Register #2
Bit 1 PLUG_OUT_INT_IM: Charger plug out event interrupt mask.
1: Mask the interrupt
0: Do not mask the interrupt
Bit 0 PLUG_IN_INT_IM: Charger plug in event interrupt mask
1: Mask the interrupt
0: Do not mask the interruptk

In normal operation you want to handle those to know that a charger is present, in suspend probably those and other PMIC IRQs should be masked.
The question is, where in the software stack is this handled exactly, ATF or Linux?