> Yes, the discussion has ended without real solution. So this is why I've asked here again. > As soon as the China device arrives I can test if it has the same issues like your Schiit. OK, device has arrived: lsusb: Bus 007 Device 003: ID 0d8c:0309 C-Media Electronics, Inc. lsusb.py: 7-3 0d8c:0309 ef 2.00 12MBit/s 100mA 3IFs (CMEDIA USB2.0 High-Speed True HD Audio) /var/log/messages: Dec 11 19:48:44 pinkfloyd kernel: [ 853.775100] usb 7-3: new full-speed USB device number 3 using ohci_hcd Dec 11 19:48:44 pinkfloyd kernel: [ 853.915155] usb 7-3: not running at top speed; connect to a high speed hub Dec 11 19:48:44 pinkfloyd kernel: [ 853.934143] usb 7-3: New USB device found, idVendor=0d8c, idProduct=0309 Dec 11 19:48:44 pinkfloyd kernel: [ 853.934154] usb 7-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Dec 11 19:48:44 pinkfloyd kernel: [ 853.934161] usb 7-3: Product: USB2.0 High-Speed True HD Audio Dec 11 19:48:44 pinkfloyd kernel: [ 853.934167] usb 7-3: Manufacturer: CMEDIA Dec 11 19:48:44 pinkfloyd kernel: [ 854.001318] input: CMEDIA USB2.0 High-Speed True HD Audio as /devices/pci0000:00/0000:00:16.0/usb7/7-3/7-3:1.2/input/input8 Dec 11 19:48:44 pinkfloyd kernel: [ 854.001694] generic-usb 0003:0D8C:0309.0006: input,hidraw2: USB HID v1.00 Device [CMEDIA USB2.0 High-Speed True HD Audio] on usb-0000:00:16.0-3/input2 What I've done so far: The device only has digital outputs. I've connected it to my AVR via optical link. For tests I'm using Audacious (output set to hw:2,0; bit depth 32 bit as suggested). The system is running Slackware 14.0 with kernel 3.2.29 (Alsa 1.0.24). Problems: * There is a blob when playback starts * 12MBit/s / full speed USB does not seem valid for me. I've thought USB Audio 2 uses high speed mode? * when trying to play a 24/96 track in Audacious I'm getting "ALSA error: snd_pcm_hw_params_set_rate failed: Invalid argument." * using aplay on the same 24/96 file and plughw instead of hw leads to: cat /proc/asound/card2/pcm0p/sub0/hw_params access: MMAP_INTERLEAVED format: S32_LE subformat: STD channels: 2 rate: 48000 (48000/1) period_size: 6000 buffer_size: 24001 Additional questions: * how can I check device capabilities? * which Alsa version is needed for USB Audio 2? -- Thorsten Mühlfelder Salix OS: www.salixos.org ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
