音频-我的一半扬声器无法正常工作

我在笔记本电脑上安装了ubuntu 20.04,只有一半的扬声器可以使用我的Pulseaudio。我有2个音频设备:

aplay -l returns this

**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC257 Analog [ALC257 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  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

The problem is that the HDA Nvidia audio driver isn't installed, because on alsamixer I can't do anything. speaker-test shows the different channels but I can only hear the sound on the right side of the laptop, not the left.

我正在使用ubuntu的默认nvidia驱动程序(nvidia-driver-440)。找不到HDA nvidia驱动程序,关于如何/在何处获取它们的任何提示?

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