Finally I have a working set of headphones on my Laptop! I have been trying to sort the problem out for some time, and have scanned many (hundreds?) of messages trying to get to the solution of my problem - why is there no sound from my headphones.
I have discovered that it is nothing to do with the version of Alsa that I am using, and nothing to do with the version of Linux or the kernel drivers. My problem is now solved.
It all comes down to the fact that in the sound chip used in the Acer there are several channels, and thus about a dozen volume controls in the mixer. Well, the control that deals with the output to the headphones is the one marked "surround sound". I just would never have guessed. Having unmuted the surround channel, I can now get sound in the headphones.
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