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I have a wonderful little wireless adapter that works perfectly well on Windows, but drops the connection regularly in Arch. As far as I can tell, it's not getting enough power to function properly. It has a USB cable that has two male ends, in order to double power input, but for whichever reason, Arch refuses to recognize that anything is in the other USB slot.

This is the output from lsusb:

Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0bda:817f Realtek Semiconductor Corp. RTL8188RU 802.11n WLAN Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

The adapter is at Bus 001.

Any thoughts?

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It probably uses the second end only to draw more current and doesn't connect to the USB bus since one connection is sufficient. –  Marco Dec 18 '13 at 22:12
    
Wouldn't lsusb mention that in some way? –  Draco6slayer Dec 18 '13 at 22:41
    
Nope, only if a USB device is connected. Just drawing power does not register a usb device. lsusb lists USB devices, not power consumption. –  Marco Dec 19 '13 at 1:05
    
Is there a way to get power consumption? –  Draco6slayer Dec 19 '13 at 3:15
    
I doubt that. For that to work each USB port would require a current sensor (e.g. an LTC chip). There might be hardware to provide access to the current per controller (root hub), but I'm not aware of any. –  Marco Dec 19 '13 at 3:36

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