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When I install the 10.04 LTS Lucid Lynx kernel on my Ubuntu 12.04 LTS system, sound works fine.

But if I use newest kernel of 12.04, it shows my audio hardware but plays no sound.

I don't want use the old kernel, because I think I cannot use some software, including GNOME 3, with it. Or at least they didn't work when I tested the old kernel, and the screen resolution was low.

I also tried newer kernels but only 2.6.33 worked without any sound problems.

My sound card is a Realtek HD ATI ALC1200 integrated card. My front jack is broken and it detects that something is always plugged in--does this affect my situation?

Do I have to buy a new sound card? That would suck.

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Did you upgrade Ubuntu from 10.04, or did you install kernel 3.2.0 in 10.04? – Takkat May 4 '12 at 11:24
Yes. Jack-sense could be breaking you. Can't you just disconnect the front-panel jack? – RobotHumans May 4 '12 at 11:41
@takkat I had 10.04, but I wiped it away and made a clean install of 12.04. I installed 10.04's kernel in 12.04. – Kimmo69 May 4 '12 at 15:00
@aking1012 This is strange. I unplugged the front panels cable, but still no sound from my system. Any Ideas? – Kimmo69 May 4 '12 at 17:53
@Kimmo69 Could you add the answer as an answer now that you've solved the problem, rather than including it in the actual question :) – coversnail May 4 '12 at 21:36

The original poster was able to solve the problem as follows (moved from being an edit to the question, to here):

I fixed this problem by going to alsamixer. There was this thing called "automute-mode" and it was enabled. By disabling it, my sound started working again. I think this had something to do with my broken front jack.

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