Minho Park Posted June 9, 2016 Share Posted June 9, 2016 Hi! I have a problem in using USB DAC. USB DAC has been usually plugined in USB port and when OPi PC boots up, it is recognized by alsa but cannot be played. As I observed, green lights on boards -> USB DAC wakes up -> it takes a little while till red light -> USB DAC goes into power save mode with light blinking -> red lights up -> USB DAC wakes up again -> after booting, USB DAC is recognized by alsa but cannot play music through USB DAC e.g. mplayer2 shows "Could not open/initialize audio device -> no sound." The only work around that I know is to plug in USB DAC after power up the board, i.e. power on OPi PC first -> plug in USB DAC and it wakes up -> play music. Plugging in USB DAC every time I hear music is annoying. I am not sure this problem is related to slow boot up and USB DAC power saving, however your advice would be highly appreciated! Thanks in advance. Link to comment Share on other sites More sharing options...
Igor Posted June 9, 2016 Share Posted June 9, 2016 I have such cheap DAC for testing purposes and I made quick test, Opi Lite, latest 3.4.112 freshly built image, Debian Wheezy. Working out of the box. I can hear a sound without any plug / unplug. Just power on and it's working, like it must.What kind of DAC do you use and did you tried with powered USB hub? Link to comment Share on other sites More sharing options...
Minho Park Posted June 9, 2016 Author Share Posted June 9, 2016 I am using TEAC AI-301DA and no plan to use powered USB hub. I am still building UPnP audio renderer from Armbian and I will try another USB DAC without power saving. Link to comment Share on other sites More sharing options...
Igor Posted June 9, 2016 Share Posted June 9, 2016 http://askubuntu.com/questions/185274/how-can-i-disable-usb-autosuspend-for-a-specific-device http://askubuntu.com/questions/80638/how-to-disable-auto-power-off-of-usb-devices-like-usb-mouse Disabling autosuspend ? Link to comment Share on other sites More sharing options...
Minho Park Posted June 9, 2016 Author Share Posted June 9, 2016 Thanks for your advice however it does not resolve the issue. USB DAC linkage seems to weak, it stops playing sometimes and replugging is needed. I tried another self-powered USB DAC and it plays UPnP audio renderer flawlessly while mplayer stream does not. It would be better to wait for the upcoming releases. Link to comment Share on other sites More sharing options...
Ford Prefect Posted June 20, 2016 Share Posted June 20, 2016 It wont help much but I had problems with HDMI sound so I tried a pair of USB speakers it worked first time. And for an unknown reason now HDMI sound works too. Link to comment Share on other sites More sharing options...
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