启用扬声器，麦克风和摄像头
我正在使用Mediacom W700平板电脑（就像SurfTab wintron 7.0 ST70416-6）和Lubuntu 18.04（我还安装了Ubuntu-dekstop，但它只有1 GB的RAM）。
如何启用扬声器，麦克风和相机？
超级（物理）按钮也不起作用。
在hardinfo中我看到： Audio: bytcr-rt5651 - bytcr-rt5651 。
所以我用过：
dmesg | grep bytcr [ 39.559314] bytcr_rt5651 bytcr_rt5651: quirk DMIC_MAP enabled [ 39.559319] bytcr_rt5651 bytcr_rt5651: quirk DMIC enabled [ 39.559322] bytcr_rt5651 bytcr_rt5651: quirk MCLK_EN enabled [ 39.581339] bytcr_rt5651 bytcr_rt5651: snd-soc-dummy-dai media-cpu-dai mapping ok [ 39.581426] bytcr_rt5651 bytcr_rt5651: snd-soc-dummy-dai deepbuffer-cpu-dai mapping ok [ 39.581557] bytcr_rt5651 bytcr_rt5651: rt5651-aif1 ssp2-port mapping ok [ 39.581652] bytcr_rt5651 bytcr_rt5651: ASoC: no DMI vendor name! [ 39.583777] input: bytcr-rt5651 Headset as /devices/platform/80860F28:00/bytcr_rt5651/sound/card1/input6
我在github上找到了这个项目，看起来很完美，它说：
要在RT5651平台上启用UCM，
将目录复制到UCM位置sudo cp -rf ../bytcr-rt5651 / usr / share / alsa / ucm
更新asound.state sudo cp asound.state / var / lib / alsa
应检测UCM文件并与Pulseaudio 4.0及更高版本一起使用
我按照步骤操作，我的pulseaudio高于4.0。
如果我在/var/lib/alsa运行sudo sh asound.state ，我会得到：
asound.state: 1: asound.state: state.bytcrrt5651: not found asound.state: 2: asound.state: control.1: not found asound.state: 3: asound.state: iface: not found asound.state: 4: asound.state: name: not found asound.state: 5: asound.state: value: not found asound.state: 6: asound.state: comment: not found asound.state: 7: asound.state: access: not found BOOLEAN: not found asound.state: 9: asound.state: count: not found asound.state: 10: asound.state: Syntax error: "}" unexpected
其他可能有用的命令：
aplay -l **** List of PLAYBACK Hardware Devices **** card 0: Audio [Intel HDMI/DP LPE Audio], device 0: HdmiLpeAudio [Intel HDMI/DP LPE Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Audio [Intel HDMI/DP LPE Audio], device 1: HdmiLpeAudio [Intel HDMI/DP LPE Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: bytcrrt5651 [bytcr-rt5651], device 0: 1 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: bytcrrt5651 [bytcr-rt5651], device 1: Deep-Buffer Audio (*) [] Subdevices: 1/1 Subdevice #0: subdevice #0 pulseaudio E: [pulseaudio] pid.c: Daemon already running. E: [pulseaudio] main.c: pa_pid_file_create() failed.
扬声器和耳机完全没声音。