Jim Grusendorf wrote:
> lsusb -v output follows, for 44.1 kHz mode first, and then 48 kHz mode:

Please try recompiling the kernel after applying this patch:

--- a/sound/usb/usbquirks.h
+++ b/sound/usb/usbquirks.h
@@ -689,19 +689,19 @@
                .vendor_name = "EDIROL",
                .product_name = "SD-90",
                .ifnum = QUIRK_ANY_INTERFACE,
                .type = QUIRK_COMPOSITE,
                .data = (const struct snd_usb_audio_quirk[]) {
                        {
                                .ifnum = 0,
-                               .type = QUIRK_IGNORE_INTERFACE
+                               .type = QUIRK_AUDIO_STANDARD_INTERFACE
                        },
                        {
                                .ifnum = 1,
-                               .type = QUIRK_IGNORE_INTERFACE
+                               .type = QUIRK_AUDIO_STANDARD_INTERFACE
                        },
                        {
                                .ifnum = 2,
                                .type = QUIRK_MIDI_FIXED_ENDPOINT,
                                .data = & (const struct 
snd_usb_midi_endpoint_info) {
                                        .out_cables = 0x000f,
                                        .in_cables  = 0x000f

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