I got a new desktop computer running Windows 7 so I'm giving this another try...
If I plug my GrubDAC alone in the USB port, without the carrie, it's recognized and I guess works fine. (I don't have plugs connected to its audio output so I cant test it)
I think the problem is with the Carrie. Here's why I think so:
I added a power switch between the carrie and the dac. When I plug the DAC in with the switch open, the DAC is recognized:
1460.483019] usb 6-2: new full-speed USB device number 52 using uhci_hcd
[ 1460.669007] usb 6-2: New USB device found, idVendor=08bb, idProduct=2707
[ 1460.669011] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1460.669014] usb 6-2: Product: USB Audio DAC
[ 1460.669017] usb 6-2: Manufacturer: Burr-Brown from TI
[ 1460.701071] input: Burr-Brown from TI USB Audio DAC as /devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.2/input/input19
[ 1460.701346] hid-generic 0003:08BB:2707.0009: input,hidraw5: USB HID v1.00 Device [Burr-Brown from TI USB Audio DAC ] on usb-0000:00:1d.0-2/input2
But the moment I close the switch to power the carrie...
[ 1528.953037] hub 6-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
[ 1528.953045] usb 6-2: USB disconnect, device number 52
[ 1531.042021] hub 6-0:1.0: connect-debounce failed, port 2 disabled
[ 1533.246020] hub 6-0:1.0: connect-debounce failed, port 2 disabled
I'm thinking my Carrie+GrubDAC combo is pulling too much power off the usb port. I tried bypassing the switch using my DMM and it tells me the carrie is pulling 40 mA. I'm having a hard time believing this, after reading the math behind this whole project. How much current should I expect my carrie to draw?