hdmi-audio

217721 HDMI连接带有Audio 显示器，S3/S5/reboot唤醒听不到唤醒音

排查思路

• S3: 暂停到内存，唤醒播放提示音前pulseaudio存在

• S4: 暂停到硬盘，唤醒播放提示音前pulseaudio存在

• S5: 关机，播放提示音前pulseaudio存在

• reboot: 重新启动，启动时播放提示音前pulseaudio不存在

查看deepin-login-sound.service依赖:

systemctl list-dependencies deepin-login-sound.service
deepin-login-sound.service
● ├─system.slice
● ├─sound.target
● │ ├─alsa-restore.service
○ │ └─alsa-state.service

查看sound.target依赖:

systemctl list-dependencies sound.target
sound.target
● ├─alsa-restore.service
○ └─alsa-state.service

查看deepin-login-sound.service文件:

sudo systemctl cat deepin-login-sound.service
# /lib/systemd/system/deepin-login-sound.service
[Unit]
Description=Deepin login sound
Requires=sound.target
After=dbus.service lightdm.service

[Service]
Type=oneshot
ExecStart=/usr/lib/deepin-api/deepin-boot-sound.sh
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

查看 /usr/lib/deepin-api/deepin-boot-sound.sh脚本

sudo cat /usr/lib/deepin-api/deepin-boot-sound.sh
#!/bin/sh

/usr/bin/dbus-send --system --print-reply --dest=com.deepin.api.SoundThemePlayer /com/deepin/api/SoundThemePlayer com.deepin.api.SoundThemePlayer.PlaySoundDesktopLogin&

问题

deepin-boot-sound.sh提示音的播放逻辑没问题，前后依赖关系没问题。

com.deepin.api.SoundThemePlayer这个走pulseaudio接口 or alsa接口？

应该走alsa接口，pulseauido在用户登录后才启动。

问题应该出在alsa-restore.service这个服务没有等到hdmi audio恢复到可用状态后再执行，还是cat /proc/asound/card/eld# 的问题

解决方案

/etc/udev/rules.d/69-hdmi-audio-check.rules

sudo tee /etc/udev/rules.d/69-hdmi-audio-check.rules <<EOF
# Run the HDMI audio check script before the alsa-restore.service
ACTION=="add", SUBSYSTEM=="sound", TAG+="systemd", ENV{SYSTEMD_WANTS}="check-hdmi-card.service", ENV{SYSTEMD_WANT_BEFORE}="alsa-restore.service"
EOF

sudo udevadm control --reload-rules

/etc/systemd/system/check-hdmi-card.service

sudo tee /etc/systemd/system/check-hdmi-card.service <<EOF
[Unit]
Description=Check HDMI Audio Availability
After=sysinit.target
Before=alsa-restore.service

[Service]
Type=oneshot
ExecStart=/usr/bin/bash -c '/usr/lib/deepin-api/check-hdmi-card.sh'

[Install]
WantedBy=multi-user.target
EOF

/usr/lib/deepin-api/check-hdmi-card.sh

sudo tee /usr/lib/deepin-api/check-hdmi-card.sh <<EOF
#!/bin/bash

# Check HDMI audio devices
hdmi_found=false

for eld_file in /proc/asound/card*/eld#*; do
    if [ -e "$eld_file" ]; then
        echo "HDMI audio device information is available in $eld_file:"
        cat "$eld_file"

        # Check the monitor_present and eld_valid flags
        monitor_present=$(grep "monitor_present" "$eld_file" | awk '{print $2}')
        eld_valid=$(grep "eld_valid" "$eld_file" | awk '{print $2}')

        if [ "$monitor_present" = "1" ] && [ "$eld_valid" = "1" ]; then
            hdmi_found=true
            # Perform additional actions as needed here
        fi
    else
        echo "No HDMI audio device found in $eld_file."
    fi
done

# Output the result
if [ "$hdmi_found" = true ]; then
    echo "HDMI audio device is ready and connected to an HDMI monitor."
else
    echo "No HDMI audio device found or not connected to an HDMI monitor."
fi
EOF

sudo chmod +x /usr/lib/deepin-api/check-hdmi-card.sh

sudo systemctl daemon-reload
sudo systemctl enable check-hdmi-card.service

优缺点

优点：

• 耦合性大幅降低
• 播放时不必等待

缺点：

• 更改配置文件较多