[ltp] usb 2.0 operating as usb 1.1
Thu, 9 Jun 2005 16:15:49 +0200
Short answer: your southbridge is about to die, get your system board
replaced. Hopefully its still under warranty.
Long answer: a number of Intel chipsets for Pentium IV and Pentium M
processors have a design flaw that makes the southbridge (which contains the
USB host controllers) especially sensitive to static electricity. As a result
there is a (small) risk that when plugging in or removing a USB device causes
damage to the chip. Usually, the first symptom is broken USB 2.0, behaving in
exactly the way you described (ie, works under Windows, but only after some
waiting and as if it was connected to a USB 1.1 controller, not a USB 2.0
one, and not at all under Linux unless you unload the USB 2.0 driver). This
tends to lead to a completely dead chipset a short time later, so better get
it serviced NOW.
Incidentially, exactly this happened to me around last Christmas. Same
Thinkpad model, too.
Bilbo: "What have I got in my pocket?"
Gollum: "It'ss a trick my preciouss. The nasty hobbit'ss got nothing in itss
pocketss. It'ss just happy to see uss."
- an Anonymous Coward on slashdot