Comment 58 for bug 185634

Ok, to 8300 shows up, disconnects, and then becomes 8501. That would suggest to me firmware is loading. (hal and ift-callout are a little *too* quiet... no dmesg output on success?) But still this "No valid video chain found." error...

cjp@byzantium:~$ dmesg | egrep '(uvcvideo|5\-4)'
[ 28.535584] usb 5-4: new high speed USB device using ehci_hcd and address 3
[ 28.672008] usb 5-4: configuration #1 chosen from 1 choice
[ 41.023834] uvcvideo: iSight firmware: firmware successfully loaded.
[ 41.023844] uvcvideo: Found UVC 0.00 device <unnamed> (05ac:8300)
[ 41.023849] uvcvideo: No valid video chain found.
[ 41.023895] usbcore: registered new interface driver uvcvideo
[ 41.095860] usb 5-4: USB disconnect, address 3
[ 42.775095] usb 5-4: new high speed USB device using ehci_hcd and address 6
[ 42.908247] usb 5-4: configuration #1 chosen from 1 choice
[ 42.908503] uvcvideo: Found UVC 1.00 device Built-in iSight (05ac:8501)
[ 42.908525] uvcvideo: No valid video chain found.