USB disconnects every 30 seconds (2.6.27-rc8)

[Dave Hansen]

I'm seeing some odd USB behavior with newer kernels
(2.6.27-rc8-00062-g330f647 to be exact).  Almost exactly, every 30
seconds, one of my USB hubs disconnects.  At first, I thought it was a
hardware issue, and started swapping cables.  Then, I realized that I'd
*just* rebooted into a new kernel.  So, I booted back to the distro
kernel and these went away.

Even though my mouse is hanging off that hub, I don't seem to notice the
disconnects.

$ dmesg | grep disconnect
[ 3599.496217] usb 3-4.4.4: USB disconnect, address 122
[ 3599.677346] usb 3-4.1: USB disconnect, address 121
[ 3627.804621] usb 3-4.1: USB disconnect, address 124
[ 3628.004400] usb 3-4.4.4: USB disconnect, address 123
[ 3659.496421] usb 3-4.4.4: USB disconnect, address 126
[ 3659.676186] usb 3-4.1: USB disconnect, address 125
[ 3689.493763] usb 3-4.1: USB disconnect, address 3
[ 3689.708916] usb 3-4.4.4: USB disconnect, address 127
[ 3719.497221] usb 3-4.4.4: USB disconnect, address 7
[ 3719.684965] usb 3-4.1: USB disconnect, address 6
[ 3749.496323] usb 3-4.1: USB disconnect, address 9
[ 3749.691180] usb 3-4.4.4: USB disconnect, address 8

Full dmesg and .config:

http://sr71.net/~dave/linux/config-10-03-2008.1.txt
http://sr71.net/~dave/linux/dmesg-10-03-2008.1.log

The last one I tried before this was -rc3, and it appears to be OK.  The
Ubuntu 2.6.24-19-generic kernel also appears not to have this issue.

A quick scan of LKML and linux-usb didn't turn up anything similar.

The machine is a Lenovo T61 plugged into the Lenovo dock.  At this
point, the only thing plugged into the suspect hub is my mouse.

-- Dave

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