From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 89511] USB-storage mount error
Date: Tue, 16 Dec 2014 21:50:27 +0000
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--- Comment #7 from Alan Stern ---
The information you want is here:
T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=04bb ProdID=0109 Rev= 1.00
S: Manufacturer=I-O DATA DEVICE INC.
S: Product=I-O DATA HDZ-UES
S: SerialNumber=0000000075A7
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 98mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=125us
The first line says that the device is attached to bus 2. The dmesg log says
the same thing:
[ 66.872687] usb 2-1: New USB device found, idVendor=04bb, idProduct=0109
[ 66.872692] usb 2-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 66.872694] usb 2-1: Product: I-O DATA HDZ-UES
[ 66.872696] usb 2-1: Manufacturer: I-O DATA DEVICE INC.
[ 66.872697] usb 2-1: SerialNumber: 0000000075A7
[ 66.918835] usb-storage 2-1:1.0: USB Mass Storage device detected
The "2-1" means the device is attached to bus 2, port 1. Therefore the file
you need to cat is /sys/kernel/debug/usb/usbmon/2u and you need to start the
cat before the device is plugged in. Use ^C to stop the cat after the error
has occurred.
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