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Hi, Using mpd and kernel 3.9.2, when I switch tracks and the next track is a different sample rate there is a fairly loud popping. There is no noise during playback. Sometimes this happens even the next track has the same sample rate. I use a usb interface is M2Tech hiface2 (XMOS UAC2, http://www.m2tech.biz/hiface2.html ). But it works with kernel 3.1.10. It seems this is a synchronization lost problem with soft mute DAC. I wonder if this problem is related to usb feedback (the hiface2 is asynchronous). With kernel 3.1.10, Feedback Format = 16.16 With kernel 3.9.2, Feedback Format = 8.16 Packet Size = 0 Some output : ===================== # uname -a Linux alarm 3.1.10-19-ARCH #1 PREEMPT Thu May 9 23:53:15 UTC 2013 armv5tel GNU/Linux # cat /proc/asound/card0/stream0 M2Tech M2Tech USB Audio 2.0 at usb-orion-ehci.0-1, high speed : USB Audio Playback: Status: Running Interface = 1 Altset = 1 URBs = 8 [ 8 8 8 8 8 8 8 8 ] Packet Size = 1024 Momentary freq = 192000 Hz (0x18.0000) Feedback Format = 16.16 Interface 1 Altset 1 Format: S32_LE Channels: 2 Endpoint: 1 OUT (ASYNC) Rates: 44100, 48000, 88200, 96000, 176400, 192000 Data packet interval: 125 us =========================================== # uname -a Linux alarm 3.9.2-1-ARCH #1 PREEMPT Mon May 13 00:02:00 UTC 2013 armv5tel GNU/Linux # cat /proc/asound/card0/stream0 M2Tech M2Tech USB Audio 2.0 at usb-orion-ehci.0-1, high speed : USB Audio Playback: Status: Running Interface = 1 Altset = 1 Packet Size = 1024 Momentary freq = 192000 Hz (0x18.0000) Feedback Format = 8.16 Packet Size = 0 Momentary freq = 192000 Hz (0x18.0000) Interface 1 Altset 1 Format: S32_LE Channels: 2 Endpoint: 1 OUT (ASYNC) Rates: 44100, 48000, 88200, 96000, 176400, 192000 =================== Thanks for your help, Bin |
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