ID 045e:00f4 Microsoft Corp. LifeCam VX-6000

[sqrt7744]

I have the current driver, and the cam works fine when plugged in
after booting, but if I leave it plugged in and restart the computer,
dmesg is spammed by the following message: sn9c20x: Read register
failed 0x1005. If I try to test it with an app, such as skype, the
spamming becomes so severe that I have to hard kill the computer
(won't even respond to alt-sysRq-R-S-E-I-U-B)

Any idea what the problem could be?

thanks,
-Peter