RE: How to resume USB hubs
Thank you Camaleón for your answer. I found the following suggestion to switch of the autosuspend option for usb devices somewhere:
# modprobe usbcore autosuspend=-1
That's why I mentioned this module.
It seems that this usbcore is something different than "ehci_hcd" and "uhci_hcd", at least in some conversations with similar topics "usbcore" and "ehci_hcd" appear both with "usbcore" having the autosuspend option. But I don't know. I did not find any information about possible options to ehci_hcd.
Hah! Got it!
While writing this I tried some more and now I've got my usb hubs back. Simply removed the modules and loaded them back again:
# rmmod uhci_hcd
# rmmod ehci_hcd
# modprobe ehci_hcd
# modprobe uhci_hcd
(In fact I did it twice, because I read somewhere that the order matters, ehci_hcd should go first, and accidently I did it the other way around first, don't know if that matters.)
So now, I know, how to get the usb hubs back again. What I still don't know is why they shut down in the first place. But I try to work that out a little later. There is still no power/autosuspend or power/level file under /sys/bus/usb/devices/...
Thank you for pointing me in the right direction,
Cheers, Gero.
> -----Original Message-----
> From: Camaleón [mailto:noelamac@gmail.com]
> Sent: Friday, 3 September 2010 2:19 PM
> To: debian-user@lists.debian.org
> Subject: Re: How to resume USB hubs
>
> On Fri, 03 Sep 2010 11:40:03 +0800, Gero Putzar wrote:
>
> (...)
>
> > Is there a way to reset the usb hubs or to reinitialise the
> > corresponding kernel drivers or whatever deals with it? (I cannot
> reboot
> > the computer at the moment.) I tried:
> > # modprobe usbcore
> > FATAL: Module usbcore not found.
>
> (...)
>
> AFAIK, "ehci_hcd" and "uhci_hcd" are the kernel modules for USB stack.
>
> Greetings,
>
> --
> Camaleón
>
>
> --
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