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I got an Android tablet which just has a single USB C port. I want to be able to use a keyboard and charge the tablet at the same time. A previous post here says that is possible.

However, I can't get it to work. I'm using this hub and this keyboard. When I plug the keyboard into the hub, the keyboard's backlight comes on for about a second and then turns off. After that, the keyboard is non-responsive. (No backlight, no caps lock LED, and typing on it doesn't have any effect.)

What do I need to do to make this work?

Additional Information:

  • The tablet is running Android 9, kernel version 4.4.147.
  • The Redragon keyboard works fine on my MacBook Pro.
  • I tried the USB-C hub with the Redragon keyboard and charger on my LG G7 ThinQ, and it worked successfully. (Keyboard works, and the phone charges.) The phone is running Android 9, kernel version 4.9.112. I do not have any non-Android devices (Windows, Mac, or Linux) with a USB-C port to test with.
  • The charger I'm using with the hub is the same charger that came with the tablet. It is 5 volts, 2 amps. The charger has a USB A port, and connects to the tablet via a USB A to USB C cable.
  • The tablet charges when connected directly to the charger. But when I put the hub in between the tablet and the charger, it does not charge. So I should probably get this part working before even worrying about the keyboard.
  • If my goal was just to charge and use a keyboard, I know it would probably be easier to just use a Bluetooth keyboard. However, I would like to use other features of the hub, such as plugging in a USB flash drive, or possibly even using the Ethernet port which is built into the hub.
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  • Are you powering the hub with a power adapter? May 17 '20 at 22:49
  • I've tried it both with and without the charger connected to the hub, and it doesn't seem to make a difference.
    – user31708
    May 18 '20 at 4:22
  • Just to make sure: 1) you've tested the mechanical keyboard on a regular PC and it works 2) you've tested the USB hub on a different device (phone or laptop) and it works i.e. you can read files from a usb drive plugged into the hub, or something else other than just charging 3) have you tried the tablet + usb hub with a different known working keyboard 4) Also when you say you've used the charger to power the hub - which charger and how much power (watts or voltage/amps) does it support. May 18 '20 at 6:16
  • To my experience when using a keyboard like yours via OTG you often run into problems if the keyboard is a fancy one like your with additional lighting or integrated USB hub and/or smartcard reader. For using a keyboard with Android therefore prefer a very simple keyboard with no extras. In your case you should think about using a Bluetooth keyboard as it would simplify the set-up.
    – Robert
    May 18 '20 at 7:33
  • @MorrisonChang I've added additional information to my post which should answer your questions.
    – user31708
    May 18 '20 at 20:56

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