我拿起 EasyCap，但听不到任何声音，视频工作正常。
如果我执行 lsusb，我会找到该设备（ID eb1a:2861 eMPIA Technology, Inc.）
我还在 pavucontrol （和 alsamixer）中看到该设备，该设备有一个端口或通道或如何称呼它（端口似乎是 pavucontrol 使用的名称），称为线路输入，它没有静音并且有音量，但我没有得到读数，就像根本没有发送任何声音一样。
作为参考，我在华硕 ROG 笔记本电脑上运行。它具有三个音频输出口。耳机插孔（我在 pavu 或 alsamixer 中找不到那个），它还有一条线，我认为它可以工作并在使用时超过内置麦克风，最后它有一条线，我目前用它来获取声音我的耳机，因为我无法从耳机插孔取出它。那么也许它是相关的？
我现在的主要问题是，我不知道如何继续进行故障排除，并且任何指示都将不胜感激，至少在我们所处的范围内，我是否必须编译内核扩展或更改黑名单文件，你知道吗？
感谢您的阅读以及解决此问题的任何帮助！
编辑（我认为相关部分是 $> dmesg | grep em28 的输出）
[ 16.370983] em28xx: New device @ 480 Mbps (eb1a:2861, interface 0, class 0)
[ 16.370985] em28xx: Video interface 0 found: isoc
[ 16.371004] em28xx: chip ID is em2860
[ 16.461559] em2860 #0: board has no eeprom
[ 16.525339] em2860 #0: No sensor detected
[ 16.531764] em2860 #0: found i2c device @ 0x4a on bus 0 [saa7113h]
[ 16.546989] em2860 #0: Your board has no unique USB ID.
[ 16.546991] em2860 #0: A hint were successfully done, based on i2c devicelist hash.
[ 16.546993] em2860 #0: This method is not 100% failproof.
[ 16.546994] em2860 #0: If the board were missdetected, please email this log to:
[ 16.546995] em2860 #0: V4L Mailing List <[email protected]>
[ 16.547001] em2860 #0: Board detected as EM2860/SAA711X Reference Design
[ 16.625341] em2860 #0: Identified as EM2860/SAA711X Reference Design (card=19)
[ 16.625345] em2860 #0: analog set to isoc mode.
[ 16.625378] em28xx audio device (eb1a:2861): interface 1, class 1
[ 16.625392] em28xx audio device (eb1a:2861): interface 2, class 1
[ 16.625454] usbcore: registered new interface driver em28xx
[ 16.907314] em2860 #0: Registering V4L2 extension
[ 17.545714] saa7115 3-0025: saa7113 found @ 0x4a (em2860 #0)
[ 18.329462] em2860 #0: Config register raw data: 0x10
[ 18.353378] em2860 #0: AC97 vendor ID = 0x414c4760
[ 18.365418] em2860 #0: AC97 features = 0x0000
[ 18.365421] em2860 #0: Unknown AC97 audio processor detected!
[ 20.769853] em2860 #0: V4L2 video device registered as video1
[ 20.769861] em2860 #0: V4L2 VBI device registered as vbi0
[ 20.769863] em2860 #0: V4L2 extension successfully initialized
[ 20.769865] em28xx: Registered (Em28xx v4l2 Extension) extension
[ 21.353059] em2860 #0: Registering snapshot button...
[ 21.353158] input: em28xx snapshot button as /devices/pci0000:00/0000:00:14.0/usb1/1-5/input/input16
[ 21.353239] em2860 #0: Remote control support is not available for this card.
[ 21.353242] em28xx: Registered (Em28xx Input Extension) extension
但为了让你拥有这里的所有信息完整的 dmesg 输出