Thorsten, list: On Tue, Dec 11, 2012 at 4:40 PM, Thorsten Mühlfelder <thenktor@xxxxxxxxxxx> wrote: >> 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 Interesting that plughw resamples to 48kHz! This is not what happens to my Schiit :-P if you look back in the discussion history, mind you I had no configuration files for alsa. Try to work with "aplay -v" and you should get immediate feedback without having to check files etc. If I recall "aplay -v -D hw:2,0" with a 96/24 file should tell you that 24 bits is not supported and suggest some others that are. -- Chris Hermansen · clhermansen@xxxxxxxxx C'est ma façon de parler. ------------------------------------------------------------------------------ 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
