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Ubuntu 14.04.1 无音频，虚拟输出，型号联想 z570 编解码器 Realtek ALC272

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Ubuntu 14.04.1 无音频，虚拟输出，型号联想 z570 编解码器 Realtek ALC272 
cat /proc/asound/card0/codec* | grep Codec 

output:

   Codec: Realtek ALC272
   Codec: Intel CougarPoint HDMI

 laptop Model: Lenovo z570

  "HD-Audio-Models.txt" contains

  ALC662/663/272
  ==============
  asus-mode1    ASUS
  asus-mode2    ASUS
  asus-mode3    ASUS
  asus-mode4    ASUS
  asus-mode5    ASUS
  asus-mode6    ASUS
  asus-mode7    ASUS
  asus-mode8    ASUS

我尝试了所有方法但都不起作用，甚至“options snd-hda-intel model=auto”也不起作用。

答案1

这是一个错误，在硬关机后就会发生这种情况。

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1264213 

fixed it. now sound works properly. but wasted a lot of time doing nonsense for days.

added this line to the file "/etc/modprobe.d/alsa-base.conf"

      "options snd-hda-intel model=ideapad"  and then

       "sudo alsa force-reload"   and then

       reboot

for more info visit this thread => http://ubuntuforums.org/showthread.php?t=1316634 


edit: 

    the above solution is not a permanent solution.
    Installing NVidia driver fixed the problem. This looks ridiculous but works.

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