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Old November 14th, 2012, 05:28 PM   #1 (permalink)
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Default Do you need Root in order to use USB Host?

I have a Droid 4. I found out recently that if you get a USB OTG cable, you can hook up a keyboard/mouse and use it with the phone. So, I bought one off of Amazon.

At this point all I had seen was someone using it on their phone. So, I plugged the cable in... and nothing. So, I googled it. And after an hour of googling later, I found a lot of guides for it, but they all required root.

So, do I need to root my phone to use a USB keyboard?

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Old November 15th, 2012, 08:06 AM   #2 (permalink)
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I always thought USB host is a hardware implementation, in the device's chipset. Some devices have USB host, others do not.

Whether USB host can be turned on or off with software or rooting, I don't know. And would there be any need to enable/disable USB host with software?

I've got two 4.0 devices here, a phone and a tablet, plus I've got a USB OTG cable that came with the tablet. I can plug a USB mouse and keyboard into the tablet and they work fine, just like a little PC...LOL. But if I do the same with the phone, absolutely nothing happens whatsoever. AFAIK the phone just doesn't support USB host, end of.
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Old November 15th, 2012, 09:22 PM   #3 (permalink)
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Thanks for the reply

I'm pretty sure that the Droid 4 has the hardware for USB host, I found several sources saying that they got it working.

But I just can't get it to work myself

I tried two different mice, and neither worked.
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Old November 16th, 2012, 03:43 PM   #4 (permalink)
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As someone told me on these forums, it's to do with the kernel apparently whether you have USB otg.
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Old November 16th, 2012, 03:45 PM   #5 (permalink)
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So, if it isn't working, then I'd need to modify the kernel?
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Old November 16th, 2012, 04:00 PM   #6 (permalink)
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NO. Don't modify anything. Root is NOT needed for USB OTG. I have a craplet from China which uses a keyboard easily. Try a different cable and keyboard before you do anything.
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