Hello Daniel, thank you for information. I asked so generally about it, because i had only very short remote session to compuer before while, where i did some listing, but didn't have chance to access actual hardware (friends are in different country). So in the meantime, i tried to gather some information about chipset compatibility and also downloaded reference XMOS firmware source. But it looks better with that particular piece based on this reference board. It turned out, that it were probably problem with incorrect values at control descriptors reported by device about its current draw and bmAttributes with and self-powered declaration. So it was fixed by new firmware with adjusted values. Interesting was, that sometimes it was properly detected, enumerated, all controls of software mixer was created, but after opening of device, there were probably uncompleted control transfers, because interface literally died during it. I plan to try it again with few kernel versions with different releases of snd-usb-audio module and do more thorough test of it, when i will have chance. Best regards and thank you very much for UAC2 support :-) Michal 2013/11/4 Daniel Mack <zonque@xxxxxxxxx>: > On 11/04/2013 12:47 AM, Michal Šmucr wrote: >> Hello to all, >> >> i would like to ask you for any experience with snd-usb-audio module >> and this board: >> http://www.xmos.com/products/reference-designs/multichannel > > This is the multichannel version of the device I used to originally > write the UAC2 support for snd-usb-audio. The multichannel version > should work just as well. > >> Friends had some issues, basically can't set hw params and initiate >> playback, with this interface and i would like to help them. > > Please post the output of 'lsusb -v', 'aplay -l' and 'arecord -l' with > this device connected. > >> So before i'll get my hands on it to do further debugging, i'd like to >> ask other potential users. >> >> I know, there are quite few compatible products and DIY designs based >> on LS-1 chip, but only with stereo SPDIF and I2S I/Os with slightly >> different base firmware by XMOS, but except of one thread on XMOS >> forum i didn't find any information about compatibility with recent >> snd-usb-audio driver. > > The driver doesn't know anything about XMOS specifically, but only about > the USB audio protocol v2, which XMOS synthesizes in software. > > > Daniel > ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
