Dear all, I'm not making much progress, didn't find any way to get 24 bit resolution working properly on this hardware (TEAC UD-H01). The only indication as to what might be going wrong comes from dmesg: [ 253.703096] ALSA sound/usb/pcm.c:1463 delay: estimated 0, actual 182 [ 255.144077] ALSA sound/usb/pcm.c:1463 delay: estimated 0, actual 182 [ 255.184079] ALSA sound/usb/pcm.c:1463 delay: estimated 0, actual 183 (when playing 88.2/24). I didn't see any of this on a 24bits, 96kHz file, but the cracking is the same. Another warning message (when loading the driver): Dec 26 14:22:37 polyphemus kernel: [ 2.135461] usb 3-2: new high-speed USB device number 2 using xhci_hcd Dec 26 14:22:37 polyphemus kernel: [ 2.149885] usb 3-2: config 1 has an invalid interface number: 3 but max is 2 Dec 26 14:22:37 polyphemus kernel: [ 2.149890] usb 3-2: config 1 has an invalid interface number: 3 but max is 2 Dec 26 14:22:37 polyphemus kernel: [ 2.149892] usb 3-2: config 1 has an invalid interface number: 3 but max is 2 Dec 26 14:22:37 polyphemus kernel: [ 2.149893] usb 3-2: config 1 has no interface number 1 But the device still works fine in 16bits mode. Rutger. On dim., 2013-12-22 at 08:36 -0800, chris hermansen wrote: > Rutger and list, > > On Dec 20, 2013 12:38 PM, "Rutger Noot" <rutger.noot@xxxxxxxxxxx> > wrote: > > > > Thanks! > > > > I mistakenly thought that the value of bcdUSB only reflected the > maximal > > capability as read from the device. And in fact speed given > > in /sys/bus/usb/devices/.../speed also corresponds to usb 2.0. So my > > problem definitely not linked to bandwidth (moreover, the dac sounds > > fine at 16/176.4 which would require at least the bandwidth of > > 24/88.2). > > > > But oddly, 24bit resolution is ok @44.1kHz. > > Rutger, a few more ideas from my own experiences with my reluctant USB > devices. > > Let's say you start playing a 9624 file with aplay and you hear > problems. If you stop and start the same file several times, is the > problem resolved? > > What messages do you see in syslog regarding the device? > > Is the behavior different if you boot vs. Hotplug the device (messages > and playback)? > ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
