我买了这个产品，问题是SPDIF输入不起作用
Linux 4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24 10:09:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
$ lspci | grep -i 音频
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:1b.0 Audio device: Intel Corporation 9 Series Chipset Family HD Audio Controller
03:01.0 Audio device: Creative Labs SB X-Fi
04:00.1 Audio device: NVIDIA Corporation GF108 High Definition Audio Controller (rev a1)
阿尔萨混合器
