Develop Bugs

Battery Charging

My Samsung GalaxyS3 will only charge via Laptop usb port, If I plug in the wall charger it dis-charges instead of charging.
I googled the problem and it seems to be unique to the S3, but did not find and reason or solution for the problem.
anyone have any idea why this has happened and what can be done to resolve the problem.
there was one suggestion that the usb plug might have dust and is not making a clean connection but that makes no sense

Have you tried different USB cables and chargers?

I had the same issue when I recently went on holiday. I took with me a non-Samsung wall charger with four USB sockets, and some oddball USB cables to charge all my devices.
My S3 was not charging over night. I discovered that the non-Samsung wall charger and the thin USB cable were not providing enough current to charge my phone.
As an experiment, I installed Ampere from Playstore on another Android phone, (it would not work on my S3), and I used it to test all 11 of my wall chargers and 5 cables and I was surprised to find some wall chargers would supply 780mA, while others only 380mA. Similarly, some USB cables would only pass 440mA where as a thicker one would pass 780mA.
The moral of the story is that the Samsung S3 is quite fussy on which wall chargers and cables it will charge from.
The best suggestion is to get a Samsung wall charger for a tablet, and the thickest USB cable you can find.

thank you

Magnetic USB-C to USB-C cable compatible with Power Delivery fast charge

I just got one of these USB-C to USB-C cables, where one end is detachable and magnetized:
https://www.amazon.com/gp/product/B075M2VV25/ref=ya_st_dp_summary?ie=UTF8&psc=1
Nothing too remarkable there, but it DOES say "Charging Rapidly" when connected to the Pixel's factory power brick. They aren't usable as data transfer cables, however. They just charge.

Might have to try that out since the Magbull Kickstarter seems to have crashed and burned
Sent from my Pixel C using Tapatalk

Thanks for the share.
I think I will get adapters only otherwise I'll have only one cable. I usually have one in the car, one at work, three home and three at the cottage... Carrying one adapter is better than needing 8 new cables or 8 adapters...
Only thing is that at $21 per adapter, it's expensive.
Is the part plugged into the phone easily removed or it would be a pain to remove/install often?
Sent from my Pixel 2 XL using Tapatalk

Erratic Charging

As of today, when I plug in the charger it will show the Dash charging symbol, then cut in and out a few times before it stays charging. I updated to 5.0.3 yesterday if it means anything.
Is this normal? I couldn't find anyone else reporting this.

It happens to me too, even back in Nougat. It starts as regular charging and then a couple of seconds later, switches to Dash. I figure the delay is due to the charger and phone figuring out how much battery the phone has left to determine how much amps to push through. Dash charging operates at different amperages depending on the voltage of the battery. Thing is, that either that never seemed to happen on my OnePlus 5 or I never noticed it, but on the 5t it does.

I think I'd be more comfortable with your issue. When I see the charging LED flashing and the charging notification disappearing and reappearing, it's unsettling.

My Nexus 5X would do this as pocket lint would build up in the USB port, preventing the USB cable from fully seating. Every so often I would have to take a small needle (something non conductive would probably be better) and carefully clean around the edges to pull out the lint. I was always amazed at how much build up really does end up in the USB port and headphone jack.

I used to have that issue with old micro USB ports and this definitely reminds me of that. I'm concerned though because I've had the phone less than a week and the port is clean. I also get that satisfying 'click' when plugging in the charger.

Ah, well that probably isn't your problem then. I would try another charger and cable to try and isolate the problem between the phone, cable, and charger.
Remember the OnePlus cable is unique, you can't use just any USB C cable with the dash charger. I believe IIRC the OEM cable has a 10k resistor, while most in spec USB C cables will have a 56K resistor. However you can use another charger and cable and see if it cuts out as well.

OhioYJ said:
Ah, well that probably isn't your problem then. I would try another charger and cable to try and isolate the problem between the phone, cable, and charger.
Remember the OnePlus cable is unique, you can't use just any USB C cable with the dash charger. I believe IIRC the OEM cable has a 10k resistor, while most in spec USB C cables will have a 56K resistor. However you can use another charger and cable and see if it cuts out as well.
Click to expand...
Click to collapse
We have three 5t phones here all purchased last week. I tried all three charges that came with the phone and it does this with each one, all plugged into different outlets.
We updated a 2nd one to 5.0.3 and now this one also has the charging notifications flicker on and off about 7 times before it stays charging normally. I haven't tested the 3rd yet because it was fully charged when I came home.
It's odd that it is two of our devices now doing this and I haven't seen anyone else with this problem. I would assume that we got phones out of a defective batch, but they were definitely not doing this before the update.

Just an update, I wiped system and cache and it still does this.
It didn't do it when I plugged in at 88% immediately after wiping. But it does do it when I plug in at around 30% like I usually do.
I'm wondering now if they all do this after the 5.0.3 update and no one really notices.

Gemini PDA picky about USB-C chargers?

My Google Pixel or ASUS chromebook chargers don't seem to work unless the pda is off. I'm disappointed that this device didn't implement USB-PD and that I can't charge from either side. What's the point of a standard connector if you need a proprietary power brick. MediaTek Pump Express was a poor choice.

I agree. So plugging into your charger when the Gemini is off WILL charge it?
I have a USB-C charger in my truck, and I will say that when my Gemini is plugged in it will hold the charge at whatever level it's at. It won't charge it, but at least power won't be depleted. Still disappointing, for sure.

dimex said:
I agree. So plugging into your charger when the Gemini is off WILL charge it?
I have a USB-C charger in my truck, and I will say that when my Gemini is plugged in it will hold the charge at whatever level it's at. It won't charge it, but at least power won't be depleted. Still disappointing, for sure.
Click to expand...
Click to collapse
Yes, if my Gemini PDA is off-off, my Google Pixel USB charger does seem to charge it. I don't have any numbers, but I doubt it's using the higher voltage modes so it's probably a slow charge. The red charging light comes on after maybe a second. Same poor behavior using an Anker PowerCore+ 26800 USB-PD with J5 Create JUCX01 USB-C to USB-C cables (an expensive but highly regarded cable supporting 100W power delivery AND 10 Gbps transfers). My car's AOLIEKS 48W USB-C USB-PD cigarette lighter port adapter is also useless for the gemini PDA when using the 30 W USB-PD port with a JUCX01 cable. I'll try using the QC 3.0 USB-A port with Gemini-provided USB cable tonight.
None of my standard USB-C chargers seem to do anything at all when the Gemini PDA is on. As though the cable isn't even detected. This indicates a firmware issue in the charge controller, IMHO. I looked closely at the Gemini-provided USB cables and the USB-C plug seems maybe 0.5mm longer than my other USB-C cables, so maybe it's a physical thing but I doubt it.

rgmmm said:
Yes, if my Gemini PDA is off-off, my Google Pixel USB charger does seem to charge it. I don't have any numbers, but I doubt it's using the higher voltage modes so it's probably a slow charge. The red charging light comes on after maybe a second. Same poor behavior using an Anker PowerCore+ 26800 USB-PD with J5 Create JUCX01 USB-C to USB-C cables (an expensive but highly regarded cable supporting 100W power delivery AND 10 Gbps transfers). My car's AOLIEKS 48W USB-C USB-PD cigarette lighter port adapter is also useless for the gemini PDA when using the 30 W USB-PD port with a JUCX01 cable. I'll try using the QC 3.0 USB-A port with Gemini-provided USB cable tonight.
None of my standard USB-C chargers seem to do anything at all when the Gemini PDA is on. As though the cable isn't even detected. This indicates a firmware issue in the charge controller, IMHO. I looked closely at the Gemini-provided USB cables and the USB-C plug seems maybe 0.5mm longer than my other USB-C cables, so maybe it's a physical thing but I doubt it.
Click to expand...
Click to collapse
I was adding a 6-outlet wall tap to the outlet near my bedside table today, and while consolidating chargers I plugged the Gemini's USB-C cable into the AUKEY 12W Dual Port Home Travel USB Wall Charger Adapter - Black charger I have. It charges the Gemini, whether it's on or off. Not sure about voltages or numbers either, but the Battery page in settings showed "Charging by AC" and the time remaining seemed pretty short.

There does seem to be some magic sauce with the included USB cable. Using that cable worked fine with my power bank, but not my car charger.

I've done some testing using a Pluggable USB-C meter (can't post links due to being new, it's on amazon).
Charging is only on the left port. (More on that later.)
Using the supplied charger + cable I get 8.8v at 1.35A (close to the 9v the charger has printed on the back, charger says it supports 12v according to the back but I guess the Gemini doesn't).
Using an Anker PowerPort+ (60w, one type-c and USB A ports) I get:
- Anker USB A to C cable: 5v (well, 4.78v), 1.8A
- Anker USB-C to C cable: Nothing. :/ (the pluggable adapter doesn't even turn on, presumably not seeing any negotiation to even turn on).
Also tried a few other USB C cables and power supplies (Apple, Chromebook) and they don't charge it or pass power.
While the left port is the only one that will charge, the Gemini will take power on the right hand port -- the amount varying by usage it seems (I've seen between 0.15A and 0.41A when worked hard), so presumably it is possible to take power from a hub which should mean the device stays alive for longer but won't charge.
I hope it's possible to add proper PD / type C charging in a software update, for me a huge advantage of type C is not needing to have different adapters for fast charging... (I'm a little confused because pump express claims to support USB PD on mediatek. c o m / features/pump-express (sorry mangled url because I can't post them...), not sure what that means in non-marketing speak as it obviously doesn't work).
Forgot to test with it turned entirely off:
- It does charge off the Anker USB-C charger via C-to-C cable, but only at 4.96v, 0.38A, i.e. you're going to be waiting a while for a charge. Makes me hopeful this is a software thing though.
---------- Post added at 09:51 PM ---------- Previous post was at 09:32 PM ----------
Replying to myself, but thought this was useful to point out:
psionfan said:
It does charge off the Anker USB-C charger via C-to-C cable, but only at 4.96v, 0.38A, i.e. you're going to be waiting a while for a charge.
Click to expand...
Click to collapse
...which does lead to an interesting trick:
Turn it off, plug it to the type C charger, then it will continue charging at a low rate while on. Could be useful if you forget the right charger (which is totally something I see myself doing).

USB-C charging is a compatibility mess, and yes, it seems Gemini PDA is on the bad end of it. I have various
But I had an LG phone that couldn't reliably charge from a MacBook Pro USB-C power supply--and it seems that charger can't charge my Gemini at all. Two rather mainstream companies that can't manage to implement a standard and make it work right, Gemini can't make it work at all, isn't unique in having problems, but clearly on the bad end...
Sounds like the USB-C standard is badly designed.
-kb

Possible Quick Charge issue

My HTC 10 is about 1 year old, and I've never saw it show the "charging rapidly" message. It always charges normally, but I think that, somehow, the quickcharge thing is not engaging.
To clear my doubts, I've purchased a USB tester (model J7-t), and found out that the phone is charging at 5.08V 1.45A, with factory original charger and cable. With another charger (a regular 2.4A charger) and another cable, it charges at 5,22V 1.45A.
With phone turned off, it charges at 5,10V 0.96A.
I've tried some tips from other threads, like turning the cable over (I assume turning over the USB-C part of the cable), cleaning the USB-C port, restarting the phone, to no avail.
It has no problems connecting to the computer for data transfer, it also charges from the computer USB port.
It's running stock Oreo with stock kernel, rooted, bootloader unlocked and S-ON. As it is, takes over 90 minutes to go from below 20% to 100%.
Is this normal? Anyone knows why it's refusing to quick charge?
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EDIT: I suspect that the culprit is the cable itself, a HTC brand cable that came with the phone. It may not be compatible with Quick Charge technology.
I researched a bit about cables, and ordered a couple of these - https://www.aliexpress.com/item/Bli...r-Cable-1m-1-8m-Mobile-Phone/32833209044.html
BlitzWolf USB-A 3.0 to USB-C model BW-TC9. The description page says that it has a 56kΩ resistor, allows data transfers up to 5Gb/s, supports Quick Charge technologies up to 3A, and is sturdy enough to tow cars without breaking. Not that I would ever tow a car with an USB cable ...
Will update this post when the cables arrive and I test them.
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EDIT2: Cables have arrived, they're some fine piece of hardware. But the phone still refuses to charge at anything over ~5V and 1.45A. I've also ran another set of tests with a QC3.0 compliant car charger, to no avail - still charges at ~5V and 1.45A. I'm starting to believe that it's some problem with either the phone itself or the ROM/firmware.

I am using xiaomi quick charger and it shows 2870mah charging current at early stages of charging. Charging current was slowly decreased when battery percentage increased. is after 90% it shows below 1000mah and below. I am using ampere app from play store.