外部声卡斯嘉丽2i2不播放声音

Question

我有第一代福克斯斯佳丽2i2，我想用它作为我16.04的声卡。按照这里的说明，我安装了PulseAudio插孔和QjackCtl GUI。然而，当我启动GUI并检查连接时，我看不到任何类似于2i2的东西：

QjackCtl截图

当我运行aplay -l && arecord -l时，2i2确实会出现：

    **** List of PLAYBACK Hardware Devices ****
    card 0: PCH [HDA Intel PCH], device 0: ALC1150 Analog [ALC1150 Analog]
      Subdevices: 0/1
      Subdevice #0: subdevice #0
    card 0: PCH [HDA Intel PCH], device 1: ALC1150 Digital [ALC1150 Digital]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 2: NVidia_1 [HDA NVidia], device 3: HDMI 0 [HDMI 0]
      Subdevices: 1/1
      Subdevice #0: subdevice #0
    card 2: NVidia_1 [HDA NVidia], device 7: HDMI 1 [HDMI 1]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 2: NVidia_1 [HDA NVidia], device 8: HDMI 2 [HDMI 2]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 2: NVidia_1 [HDA NVidia], device 9: HDMI 3 [HDMI 3]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 3: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 3: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 3: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 3: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 4: USB [Scarlett 2i2 USB], device 0: USB Audio [USB Audio]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC1150 Analog [ALC1150 Analog]
     Subdevices: 0/1
     Subdevice #0: subdevice #0
   card 0: PCH [HDA Intel PCH], device 2: ALC1150 Alt Analog [ALC1150 Alt Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 1: U0x46d0x807 [USB Device 0x46d:0x807], device 0: USB Audio [USB Audio]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   card 4: USB [Scarlett 2i2 USB], device 0: USB Audio [USB Audio]
     Subdevices: 1/1
     Subdevice #0: subdevice #0

当我运行lsusb时，它也会显示出来：

    Bus 002 Device 002: ID 8087:8000 Intel Corp. 
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 002: ID 8087:8008 Intel Corp. 
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 003 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
    Bus 003 Device 008: ID 046d:0807 Logitech, Inc. Webcam B500
    Bus 003 Device 009: ID 1235:8016 Focusrite-Novation 
    Bus 003 Device 007: ID 2687:fb01  
    Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

我有一个Logitech网络摄像头和两个GTX 660 GPU，它们解释了列出的其他设备，我不知道它们是否干扰了我连接2i2的能力。我不知道从这里到哪里，因为它似乎2i2一般是相当的即插即用。有什么建议吗？

Answer 1

在qjackctl连接中，尝试将左侧脉冲音频插孔连接到最后的“系统播放”(右侧)，这可能是您的2i2声卡：

这可以通过从左项拖放到所需的右项来完成，

或在选择项目后使用“连接”或“断开”按钮。