银河麒麟电影电视音箱后完全无声递按四步排楼：一、用lspci和cat /proc/asound/cards is recognized by the kernel, unrecognized requires enabling BIOS audio or heavy load snd_hda_intel driver; 2. 重启PulseAudio服务并验证其激活状态； 3、使用alsamixer去除Master、PCM、Speaker通道静音（MM→OO）并调整至90%； 4. 在控制中心或pactl中手动选择并设置默认输出设备为模拟音箱。

银河麒麟电影部麟麟麟麟电影全部电影全时间，requires hardware recognition, audio service, mixer channel, and output device to select 4 levels to check, skip 任一 link都 may cause the repair to fail.确认声卡和音箱硬件是否被系统识别。 | grep -i audio

若无无最名，英文声卡未被PCI bus recognition，at this time you need to enter the BIOS to check whether the “HD Audio Controller” is disabled；若已内作但最在recognization，try to force reload the driver: sudo modprobe -r snd_hda_intel && sudo modprobe snd_hda_intel

Re-run cat /proc/asound/cards，normally it will display at least one line similar to “0 [PCH] : HDA-Intel ..."的设计；【若英语的电影，视题ALSA layer has not been initialized，alsamixer和pulseaudio is not fully operational】Restart PulseAudio user audio service

PulseAudio is a UKUI desktop-dependent audio server, whose user instance crashes will cause all sound to be interrupted, and the volume icon on the taskbar will turn gray or disappear.

Check the service status in the terminal: systemctl --user status pulseaudio

If it shows inactive (dead) or failed, execute a forced restart: pulseaudio -k && sleep 0.5 && pulseaudio --start

Immediately verify whether it is active：systemctl --user is-active pulseaudio，expect to return active；若正语 Unit pulseaudio.service not found，则改用：systemctl --user enable --now pulseaudio用alsamixer release Master、PCM、Speaker channel 静音

This is the most often ignored key step—— even if the graphic interface volume is 拉满，若Master or Speaker channel is 静音 (MM display), sound box is still absolutely no sound.

First step: run alsamixer in the terminal

Second step：Press → key to switch to Master channel, observe whether the bottom shows MM； If displayed, press M key to switch to OO, then press ↑ The volume adjusts to 90%.

The third step: continue to press → switch to PCM and Speaker channel, repeat the mute and adjust operation; some notebooks need to check whether the headphone channel is accidentally enabled and suppress the speaker output.

Fourth step: press Esc to exit, set the automatic save control center to manually switch the default output device.