On Mon, 11 Jul 2016, John Westwood wrote: > I think the MTP stuff is a red herring. I checked syslog when I use a DAC that > works (Audiolab MDAC) and that has the MTP lines too, but it doesn't have the > warning line about Unlikely big volume range. > > In addition, the working DAC has the following lines which are not present the > non-working DAC: > > Jul 11 19:56:35 atlas kernel: [83940.049124] input: Lakewest Audio Audiolab > M-DAC as /devices/pci0000:00/0000:00:1d.1/usb7/7-2/7-2:1.0/0003:0451: > ADAC.0002/input/input12 > Jul 11 19:56:35 atlas kernel: [83940.104367] hid-generic 0003:0451:ADAC.0002: > input,hiddev0,hidraw1: USB HID v1.11 Device [Lakewest Audio Audiolab M-DAC] on > usb-0000:00:1d.1-2/input0 > > With the non-working DAC I get these lines instead: > > Jul 11 19:56:25 atlas kernel: [83930.079063] usb 7-2: Warning! Unlikely big > volume range (=65535), cval->res is probably wrong. > Jul 11 19:56:25 atlas kernel: [83930.079067] usb 7-2: [2] FU [PCM Playback > Volume] ch = 1, val = -32768/32767/1 > > > I think maybe the problem is similar to this one: > > https://groups.google.com/forum/#!topic/linux.debian.kernel/HwwkRkbL5aY > > Is my problem a bug in snd-usb-audio? Or am I doing something wrong? I would > really appreciate some thoughts on this, I feel like I'm talking to myself :-( Considering that you're not really doing anything, you're probably not doing something wrong. :-) On the other hand, you're likely to get more of a response if you direct your questions to the person who solved the problem mentioned in that Debian bug report, and if you CC: the sound developers' mailing list rather than the general USB list. Alan Stern _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
