Usb Snoop

[ravin 0]

Can anybody tell me how I can activate kernel logging of USB messages (usbfs_snoop)?

# modinfo usbcore gives:

filename: /lib/modules/2.6.18-gentoo-r5/kernel/drivers/usb/core/usbcore.ko license: GPL
vermagic: 2.6.18-gentoo-r5 mod_unload K7 REGPARM gcc-4.1
depends:
alias: usb:v*p*d*dc09dsc*dp*ic*isc*ip*
alias: usb:v*p*d*dc*dsc*dp*ic09isc*ip*
parm: usbfs_snoop:true to log all usbfs traffic (bool)
parm: use_both_schemes:try the other device initialization scheme if the first one fails (bool)
parm: old_scheme_first:start with the old device initialization scheme (bool)
parm: blinkenlights:true to cycle leds on hubs (bool)

So I tried to activate usbfs_snoop by:

echo Y > /sys/module/usbcore/parameters/usbfs_snoop

But dmesg is not showing the USB messages.