Hi,
Since the latest USB patch went in that added a proper delay to the
hub connection sequence, a lot of people have been reporting odd
problems with some USB hubs, keyboards, and mice. I've seen this
problem too. It is usually fixed by just replugging the device in, but
not all of the time.
The reason seems to be that usbmodules is getting called from the
hotplug package at the same time the hub driver is talking to the
device. Since we don't have control endpoint locking in the kernel USB
code yet, this messes things up :)
The patch below, from Olaf Hering, seems to fix the problem. Also just
removing the usbmodules binary seems to fix it for other people, but
that's not really a good fix.
Let me know what you think about this.
thanks,
greg k-h
Index: etc/hotplug/usb.agent
===================================================================
RCS file: /cvsroot/linux-hotplug/admin/etc/hotplug/usb.agent,v
retrieving revision 1.19
diff -a -u -r1.19 usb.agent
--- etc/hotplug/usb.agent 18 Jan 2002 03:10:42 -0000 1.19
+++ etc/hotplug/usb.agent 11 Mar 2002 21:52:10 -0000
@@ -297,6 +297,9 @@
case $ACTION in
add)
+ # Let the usb subsystem finish talking to the device, before we do
+ sleep 3
+
usb_convert_vars
FOUND=false
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