I've been getting these "irq 19: nobody cared (try booting with "irqpoll" 
option)" messages on my HP 8510w.  Recently I googled it, which lead me to the 
following discussion from another fellow with the same problem on the LKML

http://lkml.org/lkml/2008/6/24/357

In this discussion it was mentioned that pressing the radio kill switch 
stopped this message from appearing, which implied it might be iwl4965.

I had already tried blacklisting the iwl4965 module (adding it to 
/etc/modprobe.d/blacklist) with no success.  But it got me thinking radio, so 
I tried blacklisting hci_usb and there were no more "irq 19: nobody cared" 
messages.  Loading hci_usb subsequently resulted in a message within 10min.

I tried this another three times to verify it (reboot, wait 30min with no 
messages, load hci_usb, and a message appears within 10min).  Hopefully David 
will be able to verify these results also apply to his 8510w as well.

I've attached the output of "lsusb -v".  Is there any other information that 
would help, or something I can do (kernel log messages are as was given by 
David in the original LKML list, but I could attach another if you wish)?

Cheers!  -Tyson