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I've several problem with my sound card as : No sound when the HDMI is plugged, External SubWofer and the laptop speaker didn't switch off when I plugged headphone. It's an ASUS N550LF with 14.04 Kubuntu distribution.

Several forum and skill exchnage site told That I've add my model at the end of this line in my /etc/modprobe.d/alsa-base.conf file 

options snd-hda-intel model=

But I have no idea what to put in after " model".

For help, there is the ling of the alsa-info sript: Alsa-project : alsa-info Result

I fixed the Subwofer problem but that could occur some conflict External Subwofer doesn't work.

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  • In modern kernels, the Realtek driver does not have models. The analog and HDMI outputs are two separate devices; this must be configured with PulseAudio.
    – CL.
    Nov 9, 2014 at 17:55

2 Answers 2

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-The problem with HDMI may be solved with pavucontrol (install it if needed), and choosing default device in "output tab" (clicking green button)
-The problem with subwoofer may be solved by changing model as you suggest: your hda codec is Realtek ALC668 , and from this page , searching ALC66x/67x/892, you can try ASUS as model.

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according to Alsa logs you the models is not the name of laptops. you should test for example model=asus-mode1

and I think

snd-hda-intel is not correct snd_hda_intel is correct

so use options snd_hda_intel model=asus-mode4

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