> Anyway, usb-ohci is the type of my usb, (ASUS mobo with alimagik 1 chipset)
> and the problem may not be there at all since my the PC hangs when shutting
> down usb.c host 1 and two.
>
> I have an IBM Xircam usb camera which also freeses the PC when running

I don't think anyone will be able to help you unless you provide more
information first.

The FAQ (http://www.linux-usb.org/FAQ.html) has some relevant bits,
on of which I include below.

A more USB-specific suggestion is to configure your kernel with "USB
verbose debug messages", tweak usb-ohci.c so the "#undef DEBUG"
(near the top) is "#define DEBUG", then rebuild and reinitialize everything.
Then send along the relevant bits of the  kernel debug output along the
rest of your bug description; there will likely be something interesting there.
(You might need to first tweak /etc/syslog.conf to save kern.debug output
to /var/log/kernel or somesuch.

- Dave



Q: How do I report a bug?
A: In addition to the information required in /usr/src/linux/REPORTING-BUGS, it also 
helps
enormously if you provide the output of /proc/bus/usb/devices. If you are having 
problems with your
host controller being recognised, it helps to have the output of lspci -v. If it is 
supposed to be
UHCI, it helps to know whether interrupts are being generated every second. You should 
send this
information to the user/help mailing list.

If you are using UHCI, try to reproduce the problem with the "other" UHCI host 
controller driver
(HCD). There are currently two UHCI drivers, which don't always behave the same: 
usb-uhci and uhci
(the "alt" or "JE" driver). If you find that you have a workaround, please still 
report the problem!
And make sure you say which HCD(s) you're using.

If you have access to both OHCI and UHCI host controllers, please try to reproduce 
your problem with
both kinds of controller. Since these use different HCDs, they may behave differently 
in some
situations. The reason might be a device drivers assuming some HCD-specific behavior, 
or an HCD not
doing the right thing.




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