I have no sound on my headphone jack, though my in-built speakers (laptop) work just fine. Oddly enough, this problem only started when I upgraded from openSUSE 10.1 to 10.2.

>hwinfo --sound
29: PCI 10.1: 0403 Audio device
[Created at pci.286]
UDI: /org/freedesktop/Hal/devices/pci_10de_26c
Unique ID: wRyD.ALuUqiQILF2
SysFS ID: /devices/pci0000:00/0000:00:10.1
SysFS BusID: 0000:00:10.1
Hardware Class: sound
Model: "Hewlett-Packard Company MCP51 High Definition Audio"
Vendor: pci 0x10de "nVidia Corporation"
Device: pci 0x026c "MCP51 High Definition Audio"
SubVendor: pci 0x103c "Hewlett-Packard Company"
SubDevice: pci 0x30b5
Revision: 0xa2
Driver: "HDA Intel"
Driver Modules: "snd_hda_intel"
Memory Range: 0xc0000000-0xc0003fff (rw,non-prefetchable)
IRQ: 66 (2247098 events)
Module Alias: "pci:v000010DEd0000026Csv0000103Csd000030B5bc04sc03i00"
Driver Info #0:
Driver Status: snd_hda_intel is active
Driver Activation Cmd: "modprobe snd_hda_intel"
Config Status: cfg=yes, avail=yes, need=no, active=unknown

I am having problems with the same card.
http://forums.gentoo.org/viewtopic-t-531478.html
I have it playing a mp3 or wav from the command line but nothing in kde or any players I tried. I have some more work to do. I got tired of trying, I am going to wait and try another kernel later.

The audio works just fine with Amarok (MP3, WMA, etc) on the in-built Altec Lansing speakers, I just don't get any output on my headphone jack. I also know it's not the headphones since they work fine in WinXP.

I read about a 'Headphone Jack Sense' and 'Line Jack Sense' option in the Switches tab in Kmix, but there is no such tab in mine.

There's the MCP51 audio problem again.

You can see my post here on what you can expect with different versions of alsa. Results may vary given your Distro/Hardware, but they all look pretty similar:

http://www.linuxquestions.org/questi...ighlight=mcp51