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.