alsamixer 音量保存

修改历史

时间	历史
250708	创建了本文
251223	加入重启 alsamixer 音量被重置的说明

音量保存与开机加载方式

• Ubuntu 下，音量设置保存验证成功

• 打开 alsamixer 并设置音量

alsamixer

• 调整后 ESC 退出，然后保存当前设置

sudo alsactl store -f /var/lib/alsa/asound.state

• 尝试加载配置

sudo alsactl restore -f /var/lib/alsa/asound.state

• 如果配置加载没有报错，在开机脚本中加入（如果找不到 ucm.conf，加入-U 选项即可）

sudo alsactl restore -f /var/lib/alsa/asound.state

音量开机被重置的思考

• 系统中其实自带一个服务，用于在开机时自动加载/var/lib/alsa/asound.state。查看服务状态 ```bash root@rk3588:~# sudo systemctl status alsa-restore.service ● alsa-restore.service - Save/Restore Sound Card State Loaded: loaded (/lib/systemd/system/alsa-restore.service; static) Active: active (exited) since Tue 2025-12-23 07:35:22 UTC; 2min 27s ago Docs: man:alsactl(1) Process: 407 ExecStartPre=/bin/mkdir -p /run/alsa (code=exited, status=0/SUCCESS) Process: 442 ExecStart=/usr/sbin/alsactl -E HOME=/run/alsa -E XDG_RUNTIME_DIR=/run/alsa/runtime restore (code=exited, status=0/SUCCESS) Main PID: 442 (code=exited, status=0/SUCCESS) CPU: 9ms

12月 23 07:35:22 rk3588 systemd[1]: Starting Save/Restore Sound Card State… 12月 23 07:35:22 rk3588 alsactl[442]: alsa-lib parser.c:2373:(load_toplevel_config) Unable to find the top-level configuration file ‘/usr/share/alsa/ucm2/ucm.conf’. 12月 23 07:35:22 rk3588 alsactl[442]: alsa-lib main.c:1412:(snd_use_case_mgr_open) error: failed to import hw:0 use case configuration -2 12月 23 07:35:22 rk3588 alsactl[442]: alsa-lib parser.c:2373:(load_toplevel_config) Unable to find the top-level configuration file ‘/usr/share/alsa/ucm2/ucm.conf’. 12月 23 07:35:22 rk3588 alsactl[442]: alsa-lib main.c:1412:(snd_use_case_mgr_open) error: failed to import hw:1 use case configuration -2 12月 23 07:35:22 rk3588 systemd[1]: Finished Save/Restore Sound Card State.

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• 但是自动加载的这个音量，应该是会被pulseaudio重置，所以需要在开机脚本中显式加载asound.state