還要裝上 ppa:diwic/dkms 上面的 alsa-hda-dkms
還要裝上 ppa:ubuntu-audio-dev/ppa 上面的 pulseaudio
然後重新啟動
接下來看看 HDMI 接在哪裡
$ for i in /proc/asound/NVidia/eld*; do echo "<<$i>>"; cat $i; done <</proc/asound/NVidia/eld#0.0>> monitor_present 0 eld_valid 0 <</proc/asound/NVidia/eld#1.0>> monitor_present 1 eld_valid 1 monitor_name CHIMEI 22SH-L connection_type HDMI eld_version [0x2] CEA-861D or below edid_version [0x3] CEA-861-B, C or D manufacture_id 0x73b product_id 0x2d22 port_id 0x10000 support_hdcp 0 support_ai 0 audio_sync_delay 0 speakers [0x1] FL/FR sad_count 1 sad0_coding_type [0x1] LPCM sad0_channels 2 sad0_rates [0xe0] 44100 48000 88200 sad0_bits [0xe0000] 16 20 24 <</proc/asound/NVidia/eld#2.0>> monitor_present 0 eld_valid 0 <</proc/asound/NVidia/eld#3.0>> monitor_present 0 eld_valid 0從上面的紀錄可以看出在 /proc/asound/NVidia/eld#1.0 上面
不過可能會看到都是靜音的狀態
$ amixer -D hw:NVidia Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'IEC958',1 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'IEC958',2 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'IEC958',3 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off]就可以執行
$ alsamixer -D hw:NVidia在 CUI 設定畫面中全部取消靜音，接下來執行
$ pasuspender -- speaker-test -D hdmi:NVidia,1 -c 2 -t sine -l 1應該就可以聽到聲音了，確定裝置之後就可以修改 /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf 當中的
[Mapping hdmi-stereo] device-strings = hdmi:%f channel-map = left,right priority = 4 direction = output改成
[Mapping hdmi-stereo] device-strings = hdmi:%f,1 channel-map = left,right priority = 4 direction = output再重新啟動後應該就可以聽到 HDMI audio 的聲音了。
其它幫助除錯的方法還有
- $ udevadm info --export-db 可以看 udev 的設定檔有沒有被正確地使用
- $ pacmd ls 在播放音樂的途中執行可以看 pulseaudio 有沒有不正常的地方
- https://wiki.ubuntu.com/Audio/AlsaInfo 提供給開發者的資訊
- https://wiki.ubuntu.com/PulseAudio/Log 提供給開發者的資訊
