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my laptop is Compaq v3225au...
with Sound - MCP51 High Definition Audio..[/b]
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What OpenSUSE version are you using? What Desktop/Windowmanager? (ie. Gnome or KDE?). If KDE, is this v.3.5.x or 4.xx ?
now the problem is that... m getting sound as echo... i mean... like we hear a "Ding"
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in my laptop it goes like Ding Ding Ding Ding DIng Ding and goes on... it never stops... [/b]
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Please check your mic is switched off, although to be frank, this doesn't read to be a mic problem.
I have seen this problem with openSUSE-11.0 alpha3 on KDE-4.xx.
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also i have installed the alsa drivers.. but no help... [/b]
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Alsa drivers provide you sound. With no Alsa (nor OSS in some cases) you wont' have sound. So of course you have installed the alsa drivers.

... The question of interest is what version of the alsa drivers. What is the output of:
<span style="font-family:Courier New">rpm -qa | grep alsa
uname -a
cat /proc/asound/cards</span>