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Old 07-28-2012, 06:53 AM   #1
ixtab
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Why doesn't the battery charge in USB network mode?

Title says it all...

Not that it's terribly important, I'm just curious. 99% of the time I'm having the device connected with USB network on, and it just keeps discharging. Is there any technical reason for this, or is this just some kind of bug (or rather: "non-feature") in the kernel module or whatever else is responsible for the usbnetwork stuff, maybe even the hardware itself?

EDIT: Weird. Now it's charging even though it is in network mode. So maybe I'll change the question to: "Why is charging behavior in USB network mode nondeterministic?"

Last edited by ixtab; 07-28-2012 at 07:03 AM.
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Old 07-28-2012, 07:02 AM   #2
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My daughter got a new Kindle recently, and battery wouldn't charge fully, needed a software update. Problem might lie with an underpowered USB connection.

Some plug in mulit - usb adaptors do not have sufficient power for charging, so always use one connected to directly to your computer for charging purposes. I assume that your computer can see the programmes in your Kindle.
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Old 07-28-2012, 09:50 AM   #3
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Quote:
Originally Posted by ixtab View Post
EDIT: Weird. Now it's charging even though it is in network mode. So maybe I'll change the question to: "Why is charging behavior in USB network mode nondeterministic?"
Oh, but do I have a bunch of smart(-ass) answers for that opening.
I better stop typing and press "submit" right now.
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Old 07-28-2012, 10:20 AM   #4
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Oh, but do I have a bunch of smart(-ass) answers for that opening.
I better stop typing and press "submit" right now.
WTF?!
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Old 07-28-2012, 10:44 AM   #5
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I haven't played with my touch much yet, but what does the kernel log says about the charger on the touch? It was pretty verbose on the K3, even on my slightly broken device ;-)
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Old 07-28-2012, 02:00 PM   #6
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WTF?!
The:
"Why is charging behavior in USB network mode non-deterministic?"
part of the post.
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Old 07-30-2012, 05:52 AM   #7
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unplug it. plug it back in instantly. mode will now show charging.
unsure why. that fixes it for that go-round.

foofy code
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Old 07-30-2012, 10:21 AM   #8
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Quote:
Originally Posted by twobob View Post
unplug it. plug it back in instantly. mode will now show charging.
unsure why. that fixes it for that go-round.

foofy code
I was looking in the GPL code yesterday, and there is a bunch of complicated logic for enabling the "Apollo" device (USB charger) depending on USB insertion and removal events and USB device detection. There is even code for detecting whether an "official" or "third party" wall charger is plugged in. That code may require a USB insertion event to start charging while USB gadgets are in use.

If you want to see the source for your "foofy code", just look in the GPL source code from amazon. Search for "ACCESSORY".
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Old 07-30-2012, 10:22 AM   #9
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Quote:
Originally Posted by twobob View Post
unplug it. plug it back in instantly. mode will now show charging.
unsure why. that fixes it for that go-round.

foofy code
I was looking in the GPL code yesterday, and there is a bunch of complicated logic for enabling the "Apollo" device (USB charger) depending on USB insertion and removal events and USB device detection. There is even code for detecting whether an "official" or "third party" wall charger is plugged in. That code may require a USB insertion event to start charging while USB gadgets are in use.

If you want to see the source for your "foofy code", just look in the GPL source code from amazon. Search for "ACCESSORY". That code mentions controlling a voltage regulator and even specifying what voltage to set it to.
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Old 07-31-2012, 02:19 PM   #10
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