Re: Schiit USB DACs show different rates on different machines same kernel

[chris hermansen <clhermansen@xxxxxxxxx>]

I was messing around with my two Schiits on the old beater Core Duo mentioned below this morning and I learned something interesting (at least I think it's interesting):

On Wed, Nov 3, 2021 at 3:40 PM chris hermansen <clhermansen@xxxxxxxxx> wrote:

I have two older Schiit USB DACs - a Fulla original and a Fulla 2 - that show different available rates on two different machines running the same kernel.

On my late-model AMD 3800 I see:

Rates: 44100, 48000, 88200, 96000

Whereas in my old beater Core Duo I see:

Rates: 44100, 48000

Both machines are running Ubuntu 21.10 standard kernel 5.13.0-21-generic.

It's been awhile (ie certainly before the Ubuntu 21.10 upgrade) since I've tried either DAC on the old beater Core Duo, but I definitely don't remember having difficulties with 96KHz sample rates on that machine in the past

The problem with only seeing 44100 and 48000 seems to be related to the USB port on the computer.  On the top front of the computer there are two USB ports, side by side.  One only gives 44100 and 48000 and when connected I see the following message stream in syslog:

Nov  6 12:29:12 milano kernel: [ 8716.073559] usb 2-3: new high-speed USB device number 2 using ehci-pci
Nov  6 12:29:14 milano kernel: [ 8717.885575] usb usb2-port3: Cannot enable. Maybe the USB cable is bad?
Nov  6 12:29:15 milano kernel: [ 8719.121562] usb 2-3: new high-speed USB device number 3 using ehci-pci
Nov  6 12:29:16 milano kernel: [ 8719.953558] usb 2-3: device descriptor read/64, error -71
Nov  6 12:29:18 milano kernel: [ 8721.309556] usb 2-3: device descriptor read/64, error -71
Nov  6 12:29:18 milano kernel: [ 8721.417580] usb usb2-port3: attempt power cycle
Nov  6 12:29:19 milano kernel: [ 8722.969558] usb 2-3: new high-speed USB device number 4 using ehci-pci
Nov  6 12:29:20 milano kernel: [ 8723.393548] usb 2-3: device not accepting address 4, error -71
Nov  6 12:29:20 milano kernel: [ 8723.671336] ehci-pci 0000:00:1d.7: port 3 reset error -110
Nov  6 12:29:21 milano kernel: [ 8724.770849] usb 7-1: new full-speed USB device number 2 using uhci_hcd
Nov  6 12:29:21 milano kernel: [ 8724.934580] usb 7-1: not running at top speed; connect to a high speed hub
Nov  6 12:29:21 milano kernel: [ 8724.961579] usb 7-1: New USB device found, idVendor=0d8c, idProduct=1066, bcdDevice= 1.03
Nov  6 12:29:21 milano kernel: [ 8724.961584] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Nov  6 12:29:21 milano kernel: [ 8724.961587] usb 7-1: Product: I'm Fulla Schiit
Nov  6 12:29:21 milano kernel: [ 8724.961589] usb 7-1: Manufacturer: Schiit Audio
Nov  6 12:29:21 milano kernel: [ 8724.976875] hid-generic 0003:0D8C:1066.0002: No inputs registered, leaving
Nov  6 12:29:21 milano kernel: [ 8724.976940] hid-generic 0003:0D8C:1066.0002: hidraw1: USB HID v1.00 Device [Schiit Audio I'm Fulla Schiit] on usb-0000:00:1d.1-1/input2
Nov  6 12:29:21 milano mtp-probe: checking bus 7, device 2: "/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-1"
Nov  6 12:29:21 milano mtp-probe: bus: 7, device: 2 was not an MTP device
Nov  6 12:29:21 milano kernel: [ 8725.004589] mc: Linux media interface: v0.10
Nov  6 12:29:21 milano kernel: [ 8725.045957] usbcore: registered new interface driver snd-usb-audio
Nov  6 12:29:21 milano mtp-probe: checking bus 7, device 2: "/sys/devices/pci0000:00/0000:00:1d.1/usb7/7-1"
Nov  6 12:29:21 milano mtp-probe: bus: 7, device: 2 was not an MTP device
Nov  6 12:29:21 milano systemd[1270]: Reached target Sound Card.

When I plug it into the left port I see the following message stream in syslog:

Nov  6 12:30:41 milano kernel: [ 8804.357561] usb 2-4: new high-speed USB device number 6 using ehci-pci
Nov  6 12:30:41 milano kernel: [ 8804.521792] usb 2-4: New USB device found, idVendor=0d8c, idProduct=1066, bcdDevice= 1.03
Nov  6 12:30:41 milano kernel: [ 8804.521801] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Nov  6 12:30:41 milano kernel: [ 8804.521804] usb 2-4: Product: I'm Fulla Schiit
Nov  6 12:30:41 milano kernel: [ 8804.521806] usb 2-4: Manufacturer: Schiit Audio
Nov  6 12:30:41 milano kernel: [ 8804.533611] hid-generic 0003:0D8C:1066.0003: No inputs registered, leaving
Nov  6 12:30:41 milano kernel: [ 8804.533686] hid-generic 0003:0D8C:1066.0003: hidraw1: USB HID v1.00 Device [Schiit Audio I'm Fulla Schiit] on usb-0000:00:1d.7-4/input2
Nov  6 12:30:41 milano mtp-probe: checking bus 2, device 6: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4"
Nov  6 12:30:41 milano mtp-probe: bus: 2, device: 6 was not an MTP device
Nov  6 12:30:41 milano mtp-probe: checking bus 2, device 6: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4"
Nov  6 12:30:41 milano mtp-probe: bus: 2, device: 6 was not an MTP device

Note that a lot of unhappy-sounding messages seen on the left port are not seen on the right, such as the complaint about the cable, the device descriptor read errors and so on.

So I guess I am concluding that either there is a hardware fault in the right port or cabling or perhaps it's some kind of a lower-speed connection.

Anyway, seems that I can resolve this matter just by plugging into the leftmost port.

--

Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.

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