我最近重新给我的笔记本装了Debian testing,发现插入耳机时，内置扬声器无法使用（显示Speaker不可用）。手动切换到speaker也是不出声（但是kde设置的声音测试可以出声，其他应用程序不出声），拔掉耳机一切正常。
alsamixer 里 auto-mute 也是 disable（speaker一直是MM,手动切换保存后还是MM）。
然后我查到了这个帖子 如何切换声音输出 就是说alsa是这样强制设计的吗？
不过我之前也用过testing和sid,我记得当时能随时切换的（不用拔耳机）。现在重新装回了testing,倒是不能切换了。
（附：
amazing@TUF:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC256 Analog [ALC256 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [Mi Monitor]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
amazing@TUF:~$ uname -a
Linux TUF 7.1.3+deb14-amd64 #1 SMP PREEMPT_DYNAMIC Debian 7.1.3-1 (2026-07-04) x86_64 GNU/Linux