Re: USB TrackPoint mouse non-functional with dock; works if direct

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On Mon, 7 Dec 2015, Josh Triplett wrote:

> The following files appear under the power directory when plugged in via
> the dock:
> 
> ~$ head /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/2-3.1.2:1.1/power/*
> ==> /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/2-3.1.2:1.1/power/async <==
> enabled
> 
> ==> /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/2-3.1.2:1.1/power/runtime_active_kids <==
> 0
> 
> ==> /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/2-3.1.2:1.1/power/runtime_enabled <==
> enabled
> 
> ==> /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/2-3.1.2:1.1/power/runtime_status <==
> suspended
> 
> ==> /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/2-3.1.2:1.1/power/runtime_usage <==
> 0

You're looking at the wrong files.  The files to monitor are the ones
in /sys/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1.2/power
(assuming that this device really is the mouse and not something else).  
Handy shortcut link: /sys/bus/usb/devices/2-3.1.2/power.

For more information on what's happening, try collecting a usbmon trace 
for bus 2 (see Documentation/usb/usbmon.txt).

Alan Stern

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