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how to get the sound back on my laptop internal speakers?

ky flag

here is my problem : I can get no sound on my internal speakers. That means I can not listen to music on my computer (acer aspire 5742g with ubuntu 20.04) but i can get some sound if I connect an headset. I tried what is written in the following posts : no sound internal speakers but ok on headphone No sound after unplugging the headphones from the computer My question is : -how can I know if my speakers are recognised by the system ? -how can I get the sound back to my speakers ? (the problem happens quite suddenly...)

Thanks for your help !

ps : don't hesitate to ask me what point is not clear, apparently my first post was not clear enough

mangohost

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