Re: USB suspend problem with kernel 2.6.17

Em Thu, 13 Sep 2007 14:21:00 -0400 (EDT)
Alan Stern <[email protected]> escreveu:

| On Thu, 13 Sep 2007, Tiago Salem Herrmann wrote:
| 
| > It seems that the USB devices were virtually unplugged and then 
| > reattached. It only happens if there is an external *and self-powered 
| > USB device plugged, and due to this situation, the mass storage devices 
| > are renamed. Considering the sda device contains the root partition, and 
| > after the resume it is renamed to sdc, the system crashes.
| 
| In the log it appears that much the same thing happened without the 
| external self-powered device -- except that it worked!

 :-)

| > > For testing purposes you can always try reverting the "usb persist" 
| > > patch.
| > >   
| > We can't revert the usb_persist patch since the root partition is in the 
| > usb mass storage.
| > Without usb_persist patch, we can't even resume the system.
| > Searching for information we found this thread, and it seems to be 
| > related to our problem.
| > http://lkml.org/lkml/2007/3/27/149
| > Do you still have that patch you made which manages "virtual replugging"?
| 
| I'm not sure what you mean.  There never was such a patch, AFAICR.

 I think he's asking about the patch you've talked about in this
part:

"""
Long ago I posted a patch that would take care of all this.  Not just for
UHCI, but for any USB controller.  Maybe I should dig it out, update it,
and submit it.
"""

 Not sure whether this' would to fix the same issue he's getting.

| > > You should post a dmesg log showing what happens during a resume with 
| > > only bus-powered devices attached; maybe it will contain some clues.
| > >   
| > I've uploaded the dmesg to
| > http://users.mandriva.com.br/~salem/dmesg_suspend.txt
| > 
| > The only way to get it was using netconsole.
| 
| It's good, but not good enough.  To tell what's really happening you 
| need to enable CONFIG_USB_DEBUG.

 Hmm, I've thought that CONFIG_USB_DEBUG was already enabled (yeah,
I did not look at the dmesg yet).

 Thanks a lot for the help Alan.

-- 
Luiz Fernando N. Capitulino

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