Looking for a ROM that allows high power charging (>500mAh) through a usb OTG Y cable. Similar to the old style Timur kernel that allowed this on original Nexus 7 tablets. Running Nitrogen OS right now and it seems to allow charging or OTG, but not both. I need to keep my phone charged while running Octo4a (Octoprint server installable on Android phones).
Have you found a solution? I also want to revive a old android phone for the use with octoprint.
Related
Hi,
My HTC J One ([email protected]) got wet and Wifi dead. I want use it as desktop computer.
OTG for KB,mouse and USB-LAN, MHL for display. And the phone must be always powered.
(I need to find a ROM that support LAN and compile kernel module for my USB-LAN.)
So is that possible to use OTG and MHL at same time while charging the phone?
No ideas?
When I tested this, I couldn't even charge+OTG at the same time. I'm not sure whether that's a kernel restriction or hardware.
Nexus 7 (2013) with OTG and charging at the same time.
NO MODE NEEDED
[Little Intro]
I bought a Nexus 7 (2013) to use as a personal computer.
I admit, I've ****ed up the device a few times experimenting with kernels and stuff.
The thing is, you just need it rooted to use USB reading. Then you think: ok, I'm using USB and external HDs, I'm using mouse and keyboard, a external all-in-one Card Reader, and even a device that communicates with an XBox Wireless controller, but using as a computer the battery will go quickly.
I've tried two Android Cyanogen's distros and ****ed up the device 6 times. So I kept the default kernel rooted, plugged into the USB Hub device and said: well, **** off.
The thing is, when using the device I've noticed it was charging, but not saying it was charging.
[Explanation]
With my little technical knowledge of electronics I can explain what happens here.
The kernel does not support the use of OTG and charges at the same time: that is theoretical, saying that in software is not the same that measuring that.
So, what if the system charges but it just do not know?
Even if the both sides have the same potencial difference (I guess that is called voltage in english, a term disregarded in my born language, sorry about my english by the way), what if one side is providing a larger current? In theory the other side will charge, if it is a battery.
So, what actually happens is that the Nexus 7 charges, but the system level software, that, in theory, do not permit that, just do not show what is actually happening.
Obs.: I've tested the USB-Hub into my computer and it accuses overvoltage, and then when plugged to my computer I need to turn off the external power of the gadget. So, it is probably because of the specific gadget I'm using.
[Little things]
That could, may, just be possible with some specific equipment, so I will post the exactly equipment I'm using, and how I'm using it.
I ask you guys just try without the power loop I'm using to know if it is necessary, and the Nexus 9 guys to test if the same happen with it.
[The equipment]
My USB-Hub: www.dx.com/p/7-ports-powered-usb-hub-678
My OTG cable: www.dx.com/p/micro-usb-male-to-usb-female-w-usb-male-otg-cable-black-170927
[How do I connect it]
I connect the OTG cable by the male micro-USB into the tablet, loop the power with the male-USB into any USB port of the hub and connect the female-USB into the default hub main port - that one that is not the default USB-like format.
I power the USB hub and that's it. I'm using a Logitech dual transceiver with mouse and keyboard, the default microsoft XBox USB gadget, a generic all-in-one card reader and a 4GB Seagate external HD plugged into the hub.
[A final little thing]
Yes, it does not charge quickly, and yes, sometimes the battery level will be consumed a little bit. But it works well generally, without any mode needed.
It seem that is not the same as in powering mode. I'm thinking in to build an image that permits to choose between on or off in the USB out port. Can someone guarantee me that this is what the Cyanogen kernels do?
Kernel mode differences
Just to be clear, the "original" kernel mode can't know that it is charging and accessing the OTG at the same time, even doing it.
Maybe, and just maybe, the other kernel modes just let the kernel know it, having no difference to the original kernel. That's a big maybe, but a possible one.
I'd expect someone to confirm that the kernel modes "cut off" the voltage, and because of that may charge faster. Someone?
Dear tech maniacs,
I would like to pose a simple question: why original USB data cable charges far too slow my Nexus 6 when connected to a PC (USB 2.0) running windows 10? It charges at around 80 mAh.... (a catastrophe...) Does this appear because of USB malfunction, motherboard's inability, data cable flaw, or wrong windows/android setting? (So many things to blame...)
I am running official windows 10 with all latest patches on it and stock marshmallow
It's normal. USB Ports doesn't provide much Amps = it's gonna be slow
[No message]
Whenever I connect my Phone to my Laptop(Matebook X Pro), it quick charges my phone. (connection via usb c to usb c)
Is there a way I can stop that from happening and my phone leeching the battery from laptop so fast? OR stop charging it all together
Because usually I only connect my phone to laptop for roms and rooting and today for Android Q. I would charge my phone before doing these things hence I don't need my phone to suck out from laptop during this. I wonder if there is a way to reduce how much power the laptop is outputting. or turn it off all together
Besides, I have a powerbank for both my laptop and phone so if I am out and about, I'd charge the phone from the battery, it's less efficient to send it from battery to laptop to phone.
You'll probably need a custom kernel with special settings for that, as they usually try to speedup the charging instead, but I recall some bugged kernel/ROM versions (for another device that was; the Nexus 6P) which prevented fast-charging when not using an official QC adapter (like connecting it to the charge USB-port of your laptop; and that kinda sounds like what you're after). Many modern laptops have special charger-ports, sometimes even with QC support, so did you try another USB-port to see if perhaps charges slower ?
SKiLLa XP said:
You'll probably need a custom kernel with special settings for that, as they usually try to speedup the charging instead, but I recall some bugged kernel/ROM versions (for another device that was; the Nexus 6P) which prevented fast-charging when not using an official QC adapter (like connecting it to the charge USB-port of your laptop; and that kinda sounds like what you're after). Many modern laptops have special charger-ports, sometimes even with QC support, so did you try another USB-port to see if perhaps charges slower ?
Click to expand...
Click to collapse
You see, when I'm out and about I only carry usb c to USB c cable so I can't check other ports. Both of the USB C ports are USB PD :/
Sent from my Xiaomi MI 9 using XDA Labs
Use a cheap legacy micro usb cable plus type c adapter. Since its hard to find bad quality usb c cable. It wont pass high current to your phone. Bad quality cable usually have very thin wire..
Hi all - I'm finishing up installing a 2019 Samsung Tab A 10,1 into my Chrysler 300C. Everything is great, except that my USB SSD drive kills the battery when in standby. Let me detail the build:
Samsung Tab A 10,1 > USB C > Kingston Nucleum USB hub
- This is the only connection into the tablet. The hub is powered from a 12v USB point with USB 3.0 QC and a USB-C PD port. Pass through charging wakes the tablet up as the accessory power energises. Once turned off, the tablet renegotiates power supply arrangements and starts to deliver this to the hub itself. At least, that's my understanding.
Connected to the hub is a 512GB Sandisk SSD (USB 3.0), a Meizu Pro Hifi DAC (USB C) and an external USB 3.0 socket.
Is it possible to have the tablet either unmount the SSD whilst not powered (the SSD might still draw power even even unmounted?) or preferably not take on the role of being the supplier of power to the USB hub? Alternative suggestions are of course welcomed.
Prostheta said:
Hi all - I'm finishing up installing a 2019 Samsung Tab A 10,1 into my Chrysler 300C. Everything is great, except that my USB SSD drive kills the battery when in standby. Let me detail the build:
Samsung Tab A 10,1 > USB C > Kingston Nucleum USB hub
- This is the only connection into the tablet. The hub is powered from a 12v USB point with USB 3.0 QC and a USB-C PD port. Pass through charging wakes the tablet up as the accessory power energises. Once turned off, the tablet renegotiates power supply arrangements and starts to deliver this to the hub itself. At least, that's my understanding.
Connected to the hub is a 512GB Sandisk SSD (USB 3.0), a Meizu Pro Hifi DAC (USB C) and an external USB 3.0 socket.
Is it possible to have the tablet either unmount the SSD whilst not powered (the SSD might still draw power even even unmounted?) or preferably not take on the role of being the supplier of power to the USB hub? Alternative suggestions are of course welcomed.
Click to expand...
Click to collapse
You can use tasker to recognize usb charging on/off and when tab is gonna lose usb charging set it to power off. Unless tab can deliver power from usb even if its off, than you should search for another solution.
For tasker help go to Tasker tips & tricks section on XDA.
Good luck.
Sent from my Galaxy Tab 2 3G using XDA Labs
Thanks for the input! I'll have a look into Tasker. I'm guessing that when you say "power off", the tablet itself is not being shut down....after all, waking an Android device from cold is somewhat annoying to have to do manually every time one starts the engine. Currently Auto Mate wakes the tablet on a USB charging condition and instantly opens the main screen. Very convenient. Hopefully Tasker can integrate into this setup without conflicting with the functionality that works right now! I'll keep this thread updated with what I find, actions taken, etc. so that anybody else going down the path I have doesn't have to ask or chase themselves....
Cheers.
Okay, first impressions. It seems that Tasker might be able to do this but as stated, I suspect that it may conflict with the functionality of Auto Mate. After installing the demo version of Tasker and creating a basic Profile/Task to test detection of USB charging removal (beep, not sure if can/how to unmount yet) Auto Mate no longer autostarts when plugging in USB charging. That bit is somewhat of a backward step before we've even started to move forwards
I'll keep testing and experimenting and hopefully things will fall into place a little better.