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When running lsusb (not as root) with an OTG adapter plugged in without anything plugged into it I get :

u0_a83@flounder:/ $ lsusb
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0002
Bus 003 Device 001: ID 1d6b:0002

Is this normal with USB OTG adapters.

Also a USB hub is recognized as another device in lsusb when plugged using OTG

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  • Why wouldn't it be? Are you encountering an issue? – Matthew Read Mar 10 '16 at 6:35
  • Aren't they just converters? – Suici Doga Mar 10 '16 at 6:35
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Yes, that is absolutely normal. The host controller can detect the presence of the cable since pins 4 & 5 are bridged.

On my device I ran lsusb with a USB key connected via OTG, then with only the OTG cable connected, then with nothing:

$ lsusb
Bus 001 Device 002: ID 1221:3234
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0003
$ lsusb
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0003
$ lsusb

Exactly as expected. Your device appears to have one more bus compared to mine.

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  • My device has two buses when nothing is plugged in (not even the OTG , NOTHING) – Suici Doga Mar 10 '16 at 6:47
  • @SuiciDoga There's no hard requirement that they need to be disabled; it doesn't matter. – Matthew Read Mar 10 '16 at 6:50
  • My device is a Nexus 9 – Suici Doga Mar 10 '16 at 10:57

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