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DEBUGGING USB SUBSYSTEM
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0. Have HP LaserJet 1020
1. Install the latest http://foo2zjs.rkkda.com/foo2zjs.tar.gz
2. Prepare the kernel
Taken from: /usr/src/linux/Documentation/usb/usbmon.txt
# mount -t debugfs none_debugs /sys/kernel/debug
# modprobe usbmon (if kernel loads a module)
# ls /sys/kernel/debug/usbmon
1s 1t 2s 2t 3s 3t 4s 4t
# grep -B4 /proc/bus/usb/devices Laser
T: Bus=01 Lev=01 Prnt=01 Port=04 Cnt=01 Dev#= 3 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=03f0 ProdID=2b17 Rev= 1.00
S: Manufacturer=Hewlett-Packard
S: Product=HP LaserJet 1020
Bus=01 is what you fill it here,
3. Start 'cat'
# BUS=1t
# cat /sys/kernel/debug/usbmon/$BUS > /tmp/1.mon.out
4. Wait for problem.....
5. Interrupt 'cat' with Control-C
6. File bug report at:
RedHat: https://bugzilla.redhat.com/bugzilla/index.cgi
Mandriva: http://qa.mandriva.com/
SUSE: http://en.opensuse.org/Submitting_Bug_Reports
Ubuntu: https://launchpad.net/distros/ubuntu/+bugs
Do not file bug report with me. It is a kernel problem.
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