On Fri, 27 Jan 2006, Ulrich Windl wrote:
> Hello,
>
> I wanted to report a problem with Linux kernel 2.6.15.1 and uhci_hcd for USB1
> on
> an Shuttle AV11 board (VIA Apollo chipset, P III, 700MHz): An USB device
> (connected already when the kernel booted) was not accepted ("device not
> accepting
> address"). Unplugging and re-plugging the device did not work either.
> Connecting a
> memory stcik on the other port showed the same effect.
>
> However after "rmmod uhci_hcd" and "modprobe uhci_hcd" both devices worked.
> Also the problem may not appear every time during boot.
>
> This seems to be an indication that there is an initialization problem
> withing the
> USB stack. And this problem is not new in 2.6.15.1. It may have a very long
> history. Maybe someone could check the code for possible problems.
Believe me, people have been checking the code for years. All problems
with known causes have been fixed. (Although not all the fixes are in
2.6.15, since some were made after that kernel version was released.)
It would help if you provided more detailed information about your
problem. For example, try turning on CONFIG_USB_DEBUG in the
configuration and send your dmesg log showing what goes wrong during boot.
Also try your experiment of unplugging the device and re-plugging it in a
different port, and include all that in the log.
> (Note: For SuSE's 10.0 kernel 2.6.13-15.7-default I have the problem with
> ehci_hcd
> on a USB 2.0 device: The devices also seem to "not accept the address", and
> when I
> unload the ehci_hcd module, the device successfully connects as USB1. Bug
> known at
> SuSE, but no solution yet)
Alan Stern
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