On Tue, 22 Jan 2013, Norbert Preining wrote:
> Hi Felipe, hi all,
>
> On Mo, 21 Jan 2013, Felipe Balbi wrote:
> > Can you try rebuilding your kernel with CONFIG_USB_DEBUG=y and run your
> > test again ? Maybe it gives us more information of what's going on.
>
> Ok, I can reliably reproduce the problem as follows:
> * connect the kindle, it goes into usb disk mode
> * !!! important !!! use the temporary gnome3 dbus window to "Eject"
> the device
> after that the device is not really ejected
> * use "eject /dev/sdb"
> after this the device is actually ejected
> * unplug and replug
> here the usb system does not recognize the device anymore, and
> does not react on any usb connections
> * call lsusb -v gets it back to normal
> * repeat the above
>
> I have collected the syslog output of one of the cycles starting from
> lsusb -v to get back to normal, plugging, ejecting with dbus window,
> eject with cmd line, plug/replug without effect, etc.
>
> The log can be found at
> http://www.preining.info/usb-syslog-prob.txt
> I have documented the steps *in* the log file by calling
> logger ....
> with the appropriate steps, so please seach for
> norbert:
> which will give you the comments I have written with logger and
> the sequence of actions.
>
> Hope that helps, and let me know if you want/need more details.
It looks like things may improve if you do
echo 50 >/sys/bus/usb/devices/usb1/power/autosuspend_delay_ms
Quite possiblly your problem was caused when the default autosuspend
delay for hubs was changed from 2 seconds to 0. Increasing it to 50 ms
might fix things.
Alan Stern
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