I'm using a Lenovo Ideapad y410p with Ubuntu 14.04, and when I plug in headphones to my computer, the laptop speakers emit a loud, high pitched hum.
I've fixed the issue and just made this thread to answer it for others.
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Any idea what caused this? When I used my laptop earlier today, I don't remember this sound. Then again, maybe I was using different headphones, I don't remember. Right before trying the headphones tonight, I uninstalled pulseaudio, but no idea if that's related to this problem. – PJ Brunet Nov 26 '16 at 07:52
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@PJBrunet sorry I have no idea what caused the problem, it just started happening to me suddenly. – Josh Lemer Jun 20 '18 at 20:44
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The solution to this is to disable Auto-Mute Mode in alsamixer. Detailed instructions below.
Open up terminal and start alsamixer:
alsamixer
You should see a handful of tall columns with labels underneath, something like: Master, Headphone, Speaker, PCM, Mic, Mic Boost, S/PDIF, S/PDIF Default PC, Beep, Auto-Mute Mode, Internal Mic Boost
If you don't see these categories (specifically, if you don't see an "Auto-Mute Mode"), then try selecting a different sound card with F6. In my case I had to select HDA Intel PCH.
Notice "Enabled" above Auto-Mute Mode. Navigate to that item with the left/right arrow keys, and set it to Disabled with the up/down arrow keys. This should solve your problem, and you can exit alsamixer with Esc or by closing the terminal window.
Josh Lemer
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I guess this was specific to this model laptop? aparently everyone in this thread including me owns one. It worked great. – Vic Jun 23 '16 at 23:43
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1Debian 8 Jessie (Bunsen Labs) Lenovo Ideapad Y400 here. I'm not sure how this problem started. – PJ Brunet Nov 26 '16 at 07:49
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Thanks. This worked on Archlinux installed on Lenovo Ideapad 700. Interestingly, I had to enable Auto-Mute rather than disabling it! – Mostafa Farzán Aug 22 '21 at 14:54