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Re: 2 out of 4 usb sockets work



Ian Malone wrote:

I have a similar issue:
[ian atlas ~]$ /sbin/lspci |grep -i usb
00:0b.0 USB Controller: nVidia Corporation MCP51 USB Controller (rev a3)
00:0b.1 USB Controller: nVidia Corporation MCP51 USB Controller (rev a3)
[ian atlas ~]$ /sbin/lsusb -t
Bus#  2
`-Dev#   1 Vendor 0x0000 Product 0x0000
  `-Dev#   6 Vendor 0x0bc2 Product 0x3000
Bus#  1
`-Dev#   1 Vendor 0x0000 Product 0x0000
  |-Dev#   4 Vendor 0x045e Product 0x0059
  |-Dev#   6 Vendor 0x0d8d Product 0x0653
  `-Dev#   5 Vendor 0x05a9 Product 0x0518

This comprises a USB audio handset, mouse, hard-disc and webcam
(which no longer works in FC6, but it only just about works under
Windows too).

When in Windows I have USB bandwidth issues trying to use all of
these at once.  Three devices (the mouse, webcam and handset) show
up under one controller, the disc under another, no matter how
I shuffle the plugs around.

This motherboard has 4 USB sockets on the rear panel and headers
for another 4, of which two are attached to ports.  I've come to
the conclusion:
1.  I only have one controller, I can't see any other reason for
  the bandwidth problem.
2.  Three of the devices do USB 1.1, the disc is the only one doing
  USB 2.0 (since it shows up under the high speed controller.

The hub determines if the socket is connected to the USB 2.0 or 1.1 controller, based on the device plugged in. It is possible that both controllers and the hub are all on the same chip. Because the drive is the only USB 2.0 device, it will always be connected to the USB 2.0 controller, no matter what socket you plug it into.

Mikkel
--

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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