Hello all!
I have two Audio-gd DACs, they both use VIA VT1731 USB receiver chip,
but they have different firmwares. The problem is, that one of the two
firmwares behaves "strange". The DAC does not "lock in" correctly, when
it is set to 2x oversample, but has no problems when set two 4x or 8x
oversample (these are WM8741 filter features). By "does not lock in" I
mean, that DAC is recognised by the system, but only noise is heard.
This noise (sounds like white noise) stops when music is started.
I know this is not ALSA problem per se, but would like to know if
anybody can explain why this is happening.
I am attaching lsusb -v prints:
FW4 - has no problems in locking
FW2014-2 - DAC set to 2x oversampling (noise problem)
FW2014-4 - DAC set to 4x oversampling (same FW/DAC as FW2014-2, but set
to 4x oversampling, no problems)
FW9-FW2014-2diff - diff output between FW9 and FW2014-2 (2x oversample)
lsusb -v output
FW9-FW2014-4diff - diff output between FW9 and FW2014-4 (4x oversample)
lsusb -v output
FW2014-2-FW2014-4diff diff output between FW2014-2 (2x oversample) and
FW2014-4 (4x oversample) lsusb -v output
To avoid misunderstanding, I did try to change firmwares on DACs, but
problem appears no matter which DAC is used, so the problem is in the
firmware, not the DAC.
Thank you,
Davor.
Bus 002 Device 010: ID 040d:3410 VIA Technologies, Inc.
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Bus 002 Device 009: ID 040d:3410 VIA Technologies, Inc.
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bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 61
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 16------------------------------------------------------------------------------
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