pinetab2 booting when adapter connected
#1
Hi all,

I received my Pinetab two weeks ago. Had it plasma-bricked, reinstalled the image and did an update of all software immediately after. Everything (as advertised that is) works fine. But I got an issue now because it's booting when connected to a power source. No need to press the power button; it just boots.

Is there a setting in the UEFI that causes this problem, and if so, how can it be adjusted?

Thanks in advance!
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#2
Welcome, Ome!

The machine starts up when you plug it into a power source. That's a known "feature." I try to plug it in before shutting it down. Then it stays shutdown.
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#3
Heart 
(08-27-2023, 11:32 AM)frtodd Wrote: Welcome, Ome!

The machine starts up when you plug it into a power source. That's a known "feature." I try to plug it in before shutting it down. Then it stays shutdown.

Thanks for the warm welcome!
I'm wondering: is this a pine-feature or a linux feature?

I (try to) have the nasty habbit of cycling through Europe for a few months each year, and while traveling I charge my gadgets from a dynamohub and some self crafted hardware. That means that at every red traffic light I encounter, the voltage goes to zero, until it reaches 5 volt again somewhere across the street and charging restarts.  I actually purchased the pinetab to accompany me on my travels (and because I like what Pine64 is doing and because I sincerely dislike some OS producing techfirms that I will not name here but you'll probably be familiar with).

Now this "feature" has as an extremely stupid consequence that I'll be charging my tablet as it's fully operational in a closed bikepannier.

To me , to put it mildly, this does not seem to be the most efficient way of charging my - otherwise totally lovely - new gadget. To put it less mildly: ithis is a feature you want in servers, not in consumer electronics. And if you do have it in consumer electronics it should default to "off".

So I'm really curious who figured this "feature" out. Was it this Thorvalds fellow, one of his nephews at Danctnix, somebody at the pineclub or one of the factory workers where our tablets are being assembled?

I also may need this persons' emailaddress.  Big Grin Tongue At

Ome Ko
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#4
Why don’t you just connect the PT2 to a powerbank, turn it off and your dynamo to the powerbank?
Satisfied PinePhone, Pinebook Pro & PineTab2 owner; Thank you Pine64Team for your work!  Smile
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#5
(08-27-2023, 12:10 PM)Ome Ko Wrote: I (try to) have the nasty habbit of cycling through Europe for a few months each year, and while traveling I charge my gadgets from a dynamohub and some self crafted hardware. That means that at every red traffic light I encounter, the voltage goes to zero, until it reaches 5 volt again somewhere across the street and charging restarts.  I actually purchased the pinetab to accompany me on my travels (and because I like what Pine64 is doing and because I sincerely dislike some OS producing techfirms that I will not name here but you'll probably be familiar with).

I'm with you on hardware not from the big surveilance firms!

That is a very specialized (but very awesome!) use case. Though I agree with the basic sentiment about defaulting to startup for servers and stay shutdown for tablets, I have no idea where this particular characteristic comes from in our case.

It sounds like, as dachalife suggested, you may want a little bit more self-crafted hardware to maintain that 5v at traffic lights and such. But this "feature" is going to be a pain for you, for sure.
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#6
Lightbulb 
(08-28-2023, 05:44 AM)dachalife Wrote: Why don’t you just connect the PT2 to a powerbank, turn it off and your dynamo to the powerbank?

Good thinking!
Unfortunately charging a battery by a battery doubles the efficiency losses. Due to heat dissipation as a result of transition resistance, the losses while charging a battery amount to 20% depending on hardware and current.
Your proposal would reduce the overall charging efficiency to 60% which is a really demotivating number when you have to pedal the power into your pinetab yourself...

Quote:It sounds like, as dachalife suggested, you may want a little bit more self-crafted hardware to maintain that 5v at traffic lights and such. But this "feature" is going to be a pain for you, for sure.

You are right. It would involve a bufferdevice; i.e. an extra battery with the aforementioned setbacks...
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#7
I was just trying to offer a solution, like mine:


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Satisfied PinePhone, Pinebook Pro & PineTab2 owner; Thank you Pine64Team for your work!  Smile
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#8
(08-28-2023, 10:00 AM)dachalife Wrote: I was just trying to offer a solution, like mine:

It's a sound idea and it would work.
It's just that in my very specialised case it's not an ideal solution. I remember being quite happy when I discovered this feature in the bios of my servers, but I've never had a laptop that showed this behaviour.
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#9
(08-27-2023, 12:10 PM)Ome Ko Wrote:
(08-27-2023, 11:32 AM)frtodd Wrote: The machine starts up when you plug it into a power source. That's a known "feature." I try to plug it in before shutting it down. Then it stays shutdown.

I'm wondering: is this a pine-feature or a linux feature?

...

So I'm really curious who figured this "feature" out. Was it this Thorvalds fellow, one of his nephews at Danctnix, somebody at the pineclub or one of the factory workers where our tablets are being assembled?

It isn't a feature, it's a bug. The PineTab2 works surprisingly well given how new it is and thus how much work has been done on the software side.
And that includes the kernel/DeviceTree side of things.

Audio (together) with headphones didn't work correctly at first, but if you got the latest update(s), then it should all work properly.

I know this charging/poweron issue is known, but I do not yet know if there is a solution and/or whether it's deployed yet.

And there are other known and unknown issues which hopefully all get resolved at some point.

And if you try to be snarky/funny, at least get Torvalds name right ...
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#10
Sorry for the blasphemy.
I'll try to be more bitchy next time. Tongue 

Keep up the good work!
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