我最近买了一台戴尔 7410，但新安装时内置麦克风无法使用。它只会发出嘶嘶声。但当我使用蓝牙耳机时，它工作正常。
lspci -nn 命令显示此音频设备：
Audio device [0403]: Intel Corporation Device [8086:02c8]
而读取dmesg只可以看到：
[ +0.045497] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC3254: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[ +0.000001] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ +0.000001] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[ +0.000000] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ +0.000001] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ +0.000000] snd_hda_codec_realtek hdaudioC0D0: Headset Mic=0x19
[ +0.000001] snd_hda_codec_realtek hdaudioC0D0: Headphone Mic=0x1a
[ +0.000001] snd_hda_codec_realtek hdaudioC0D0: Internal Mic=0x12
[ +0.059235] input: HDA Intel PCH Headphone Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input39
[ +0.000059] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input40
[ +0.000054] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input41
[ +0.000040] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input42
[ +0.000036] input: HDA Intel PCH HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input43
[ +0.000041] input: HDA Intel PCH HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input44
有人知道发生了什么事吗？