Hello Daniel, thank you for your advices. It took a while, before that USB interface arrived to me for testing, so i'd like to post update. Sorry, i missed your question regarding its connection during previous remote test. One time it was connected as sole downstream device to mainboard hub, second time there was also USB keyboard connected. It has updated firmware, which resolves mentioned incorrect descriptor fields and it works like a charm. I did successful tests with different Fedora kernels (3.8 - current 3.12 from Rawhide) and also tried CentOS 2.6.32-358 with some RedHat's snd-usb-audio related backports applied. So XMOS USB audio software stack is definitely compatible.. That is really good :-) It was also interesting for me as i proceeded different module versions and its improvements. Best regards, Michal 2013/11/5 Daniel Mack <zonque@xxxxxxxxx>: > On 11/05/2013 03:34 AM, Michal Šmucr wrote: >> 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. > > Was there anything else connected to the same bus (or bus power domain, > for that matter)? > >> 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. > > That's not improbable. The device will draw more current when the > streaming starts or the interface is selected or under other > circumstances (depends on the hardware and firmware design). If the > device then draws more power than the host is able to provide, a > brownout condition occurs and the device resets. > > My general advise in such cases is to use powered USB hub in between, if > only for tests. > >> 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. > > Alright. > > > Thanks, > Daniel > ------------------------------------------------------------------------------ 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=84349351&iu=/4140/ostg.clktrk _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
