英伟达tegra210 连接电视/hifi，默认声卡无法自动选择HDMI，只能手动选择（默认是模拟输出）

Question

英伟达tegra210 （板卡没有扬声器等设备）连接电视/hifi，屏幕音量有2个选项，hdmi和模拟输出，默认是模拟输出。查看板卡信息：

 aplay -l

card 0: tegrahda [tegra-hda], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: tegrasndt210ref [tegra-snd-t210ref-mobile-rt565x], device 0: ADMAIF1 CIF ADMAIF1-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: tegrasndt210ref [tegra-snd-t210ref-mobile-rt565x], device 1: ADMAIF2 CIF ADMAIF2-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: tegrasndt210ref [tegra-snd-t210ref-mobile-rt565x], device 2: ADMAIF3 CIF ADMAIF3-2 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: tegrasndt210ref [tegra-snd-t210ref-mobile-rt565x], device 3: ADMAIF4 CIF ADMAIF4-3 []

>  ls
card0  cards    hwdep  tegrahda         timers
card1  devices  pcm    tegrasndt210ref  version

> cat cards
 0 [tegrahda       ]: tegra-hda - tegra-hda
                      tegra-hda at 0x70038000 irq 81
 1 [tegrasndt210ref]: tegra-snd-t210r - tegra-snd-t210ref-mobile-rt565x
                      tegra-snd-t210ref-mobile-rt565x

看alsa.conf文件，默认声卡应该选择hdmi，但是实际打开屏幕，默认是模拟输出。

参照网上方法，在asound.conf文件加入 defaults.pcm.card 0 defaults.pcm.device 3 defaults.ctl.card 0 。重启后打开音乐没有声音，手动选择hdmi，音乐有声音。试了几天，还是不能开机自动是hdmi。

请教一下，如何才你开机就是hdmi？

Answer 1

设置开机默认输出是hdmi，陆续尝试了几个星期，昨天终于成功了，现将方法记录下来分享。
1、查询声卡详细信息： pacmd list-cards
2、找到你要设置的默认声卡的 索引号和 有效文件：如下

2 card(s) available.
    index: 0
    name: <alsa_card.platform-70030000.hda>
    driver: <module-alsa-card.c>
    owner module: 7
    properties:
        alsa.card = "0"
        alsa.card_name = "tegra-hda"
        alsa.long_card_name = "tegra-hda at 0x70038000 irq 81"
        device.bus_path = "platform-70030000.hda"
        sysfs.path = "/devices/70030000.hda/sound/card0"
        device.form_factor = "internal"
        device.string = "0"
        device.description = "Built-in Audio"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card"
    profiles:
        output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5400, available:unknown)
        off: Off (priority 0, available: unknown)
    active profile: <output:hdmi-stereo>
    sinks:
        alsa_output.platform-70030000.hda.hdmi-stereo/#0: Built-in Audio Digital Stereo (HDMI)
............

下边是在信息中找到我要默认的声卡输出和索引

 index: 0
active profile: <output:hdmi-stereo>

3、在/etc/pulse/default.pa文件末尾添加：

set-card-profile 0 output:hdmi-stereo
set-default-sink 0

4、重启默认声卡就变成hdmi