[Bug 216282] usb-mass storage

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216282

--- Comment #21 from Alan Stern (stern@rowland.harvard.edu) ---
It looks like you may be right about the initial time delay being too small.  I
don't see any significant differences in the usbmon trace between the initial
plug-in and the later one, except that the device failed to respond during the
initial plug-in when asked to identify itself.

(You can compare them yourself just by looking at the trace file.  The initial
plug-in is detected at line 7, and the second plug-in is detected at line 193. 
The lines subsequent to those are virtually identical if you ignore the first
two columns, with just one or two unimportant differences -- up until the
failure at line 75.)

You can change the length of the time delay by setting the usb-storage
delay_use parameter.  For instance, assuming that the usb-storage module is
already loaded, do:

   echo 20 >/sys/module/usb_storage/parameters/delay_use

before you plug in the drive.  That will change the delay to 20 seconds (the
default delay value is 1 second).  Maybe it will help.

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