PinePhone: battery charging

Let's formally track the status in this issue, please help with answering. If we are confident, that everything is working, we can close this issue and have it show up in the milestone as resolved.

• does charging work 100% of the time?
• can we display the percentage properly?
• is charging-sdl working?

changed milestone to %[device] PinePhone support

By Oliver Smith on 2020-03-22T01:03:54

added category::device help wanted labels

• does charging work 100% of the time?

  looks like it, but only from wall charger (not from usb-typec)

• can we display the percentage properly?

  currently not always, but I remember some branch was posted in pine64-dev channel that fixes this display issue

• is charging-sdl working?

  does not look like it, phone just turns on (IMO)

By Alexey Min on 2020-03-22T21:52:20

mentioned in issue #516 (closed)

By Anjandev Momi on 2020-03-22T23:33:38

@ charging-sdl:

the kernel (or u-boot) currently has no knowledge of the boot reason. The AXP803 contains the "Power up/down reason register" which can be queried for the status but nothing currently does that.

By Luca Weiss on 2020-03-24T21:26:23

Copy-pasting from #516 (closed) as instructed:

When the phone is left off for a few days, the battery apparently drains well below "0%" indication, because subsequent charging spends quite a lot of time (15 minutes) at 0%. I guess this calls for a hardware change that prevents the battery from going into such deep discharge.

By Alexander E. Patrakov on 2020-04-15T03:26:45

I have probed the battery and terminals using a multimeter and found that [+ve] and [-ve] are constantly drawing 1.5mA. If my math isn't garbage, with the battery at full charge, it would take more than 83 days to fully drain. But if the battery is already low then it will continue to discharge below that amount. I would assume that eventually the protection circuit would kick in so it would not over-discharge at some point, but nonetheless it is an issue. My guess is that the "stuck at 0%" issue must be software, since I do believe reading the charge is not accurate at this time. Correct me if I am wrong.

By Ethernet Cable on 2020-04-15T03:26:45

I'm not sure if the charging percentage/reading is accurate, but let's split charging-sdl not working off to it's own issue, #750 (closed)

By Bart Ribbers on 2020-09-05T13:26:29

added device-pine64-pinephone label

Charging has worked fine for ages and osk-sdl is not shipped anymore in pmOS, closing.

By Bart Ribbers on 2022-01-28T14:56:15

closed