| I have a sound card with a CM6631A audio chip running UAC 2.0. There are 2 analogue sub devices on the chip both of which should support S32_LE, however I do not see the S32_LE alt setting for one of the outputs. lsusb -v, I see the following for each output: Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 3 bNumEndpoints 2 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 0 AudioStreaming Interface Descriptor: bLength 16 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 1 bmControls 0x05 Active Alternate Setting Control (read-only) Valid Alternate Setting Control (read-only) bFormatType 1 bmFormats 0x00000001 PCM bNrChannels 2 bmChannelConfig 0x00000003 Front Left (FL) Front Right (FR) iChannelNames 0 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 32 and Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 3 bAlternateSetting 3 bNumEndpoints 2 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 0 AudioStreaming Interface Descriptor: bLength 16 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 3 bmControls 0x05 Active Alternate Setting Control (read-only) Valid Alternate Setting Control (read-only) bFormatType 1 bmFormats 0x00000001 PCM bNrChannels 2 bmChannelConfig 0x00000003 Front Left (FL) Front Right (FR) iChannelNames 0 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 32 Both of the above have an entry for bit resolution of 32 for bAlternateSetting 3. Output of alsa-capabilities 0) USB Audio Class Digital alsa audio output interface `hw:0,0' - device name = USB2.0 High-Speed True HD Audio - interface name = USB Audio - usb audio class = 2 - isochronous asynchronous - character device = /dev/snd/pcmC0D0p - encoding formats = S24_3LE, S16_LE - monitor file = /proc/asound/card0/pcm0p/sub0/hw_params - stream file = /proc/asound/card0/stream0 1) USB Audio Class Digital alsa audio output interface `hw:0,1' - device name = USB2.0 High-Speed True HD Audio - interface name = USB Audio #1 - usb audio class = 2 - isochronous asynchronous - character device = /dev/snd/pcmC0D1p - encoding formats = S24_3LE, S32_LE, S16_LE - monitor file = /proc/asound/card0/pcm1p/sub0/hw_params - stream file = /proc/asound/card0/stream1 Sub device 0 is missing the S32_LE alt setting. When I plug this into OSX, I see 32bit support on both outputs. uname -a Linux ubuntu 4.4.0-72-lowlatency #93-Ubuntu SMP PREEMPT Fri Mar 31 15:25:21 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux cat /proc/asound/version Advanced Linux Sound Architecture Driver Version k4.4.0-72-lowlatency. (reporting v1.1.0 in alsamixer) Ed Stark |
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