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Well, I think that I've found the solution. Maybe it is not a solution for the problem itself, but after restart headphone jack in my acer 3682 works just fine.
In my case, enablig headphone jack is possible by disabling for 15 seconds Realtek soundcard in device manager.
So I created bat file which do that.
@echo off
devcon disable HDAUDIO\FUNC_01
sleep 15
devcon enable HDAUDIO\FUNC_01
devcon is a command-line device manager - it can be downloaded from microsoft page.
sleep is typical command which causes system waiting for n seconds - also can be downloaded for free.
Then I created shortcut which starts this bat file in minimized mode and I put it into autostart folder.
good luck.
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