On 12.12.2012 00:42, Thorsten Mühlfelder wrote: >>> The system is running Slackware 14.0 with kernel 3.2.29 (Alsa >>> 1.0.24). >> >> This kernel is *way* too old. Please try a 3.7 which has just been >> released. > > OK, I've updated to 3.7.0. > > Now lsusb.py shows the device in high speed: 3-3 0d8c:0309 > ef 2.00 480MBit/s 100mA 3IFs (CMEDIA USB2.0 High-Speed True HD > Audio) > > Also it is possible to play files with 96 kHz sampling rate > (S32_LE). Ok, good. > Problems left: > * There is a blob at the beginning of playback This is most probably a bug in the hardware chain somewhere. Can you exclude the possibilty that this plop is produced by the receiving side and occurs every time the link was lost? You can try that by re-plugging the optical cable while audio is streaming. > * each > time playback format changes (16/44 to 24/96 and back) the sound is > totally scrambled, but /proc/asound/card2/pcm0p/sub0/hw_params shows > the correct playback format. Stop/start playback solves the problem. This is a known bug, also most probably flaw in the CMEDIA chip, and not yet properly worked around in the snd-usb driver. If you want to investigate, have a look at the feedback format autodetection code in sound/usb/endpoint.c. Daniel ------------------------------------------------------------------------------ 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
