Hi, On 06.02.2013 00:13, chris hermansen wrote: > I wonder if any of you have any experience yet with the Audioquest > Dragonfly, specifically under Ubuntu 12.10 which is running this kernel > GNU/Linux 3.5.0-23-generic x86_64 > > This device sounds fine with 44.1 kHz / 16bit files but the 88.2 and 96 > kHz / 24bit files do not. Specifically, I can hear the music for both > of those files, but there is a loud kind of "static" thing going in the > foreground. > > A "cat /proc/asound/DragonFly/stream0" when playing at all three bit > rates seems to show "reasonable" parameters. Also, the LEDs on the > Dragonfly show the correct color corresponding to the bit rate. > > One thing I note is that Alsa seems to want to run at 24 bits even for > the 16 bit files ie one is forced to use plughw:1,0 for the output. What is forced exactly? The Linux driver sends data in 24bit if the device requests 24bit sample format, and it lets the driver know through its descriptors. I wonder why specifing a certain output device should change anything in that regard. > When I was debugging my Schiit Bifrost (still not working the way I want > FWIW) I recall some patching that Daniel Mack was applying to the kernel > in 3.6 (I think). Perhaps I need a newer kernel...? Do you see similar behaviour with the DragonFly than with the Bifrost, in a way that stopping and restarting the stream would recover it? Also, did you test the device with Mac OS X maybe, without installing any third-party driver? You can of course, if you're able to, hack the driver and force a certain output format, just to see if that stops the static noise for you. Then you know where exactly to look for possible misbehaviour of the driver. Most likely though, we need to work around a hardware bug with a quirk here. Could you send the output of 'lsusb -v', please? Daniel ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
