Can someone explain the output from lsusb here?

[Karl Auer]

On Thu, 2009-07-02 at 12:56 -0700, NoOp wrote:
> On 07/01/2009 07:05 PM, Karl Auer wrote:
> > I'm puzzled because only two of supposedly 6 USB interfaces work on my
> > new Dell Vostro 1720.

Well, I finally found time to properly investigate this little problem,
and started by testing it with other devices. To mixed emotions I
discovered that my original Microsoft optical mouse (Intellimouse) does
not work in any of the four USB ports on the left edge of the Vostro. It
*does* work in both the ports on the right hand edge. It is very
difficult to insert the USB plug into the any of the four right-hand
ports, too, but not so difficult that there is any suggestion of damage
happening. Just very stiff.

Another mouse - a younger Logitech Click! optical mouse, works in all
six ports, and its plug is noticeably easier to insert into the
right-hand ports.

I then tried a memory stick - it works in all six ports. As did two
other memory stick of various sizes and very varied vintage.

A 2.5" USB drive enclosure with a 160Gb drive in it powers up but does
not trigger any USB software activity at all. However, when I replace
the drive in the enclosure with a 40Gb drive, it works in all six USB
ports, so I suspect the enclosure itself (or possibly the disk, but as
far as I know it is OK).

A Logitech QuickCam Notebook Pro with a built in microphone is detected
as a camera and mike by the right hand ports, but only as a mike by the
left hand ports. Once detected though, it works fine as a camera or a
mike in all but one of the left hand ports! It gets power in all four.

Adding a hub between the cam and the USB ports did not help.

So confusion reigns :-( but it looks to me like dicky contacts in the
left-hand four ports. Or possibly in my cables, of course.

I'm happy that I can arrange my various USB devices to my satisfaction,
and will try to document all this more comprehensively before taking the
matter to Dell (which I may not do, as the pain threshold has not really
been crossed :-)

Thank you for the many ideas.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

GPG fingerprint: 07F3 1DF9 9D45 8BCD 7DD5 00CE 4A44 6A03 F43A 7DEF

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