The Audio playback device HDA Intel (ALC268 Analog) doesn't work.

Every time I login to KDE through KDM, the notification gives me this message: "The Audio playback device HDA Intel (ALC268 Analog) doesn't work. Falling back to default"
Everytime I try to play an audio file, the notification gives me the same message.
But everything else such as system sound, online video work.
What can I do to make it work?
thank you for your help

I have the same problem under the same conditions the original poster described. However, under System Settings -> Multimedia -> Device Preference I don't have default as device listed. The devices I can pick are:
-Esound (ESD)
-HDA Intel (STAC92xx Analog)
-HDA Intel, NVIDIA HDMI (HDMI Audio Output)
-Jack Audio COnnection Kit.
I can also pick HDA Intel (NVIDIA HDMI) when I check  'Show advanced devices'
When I use Esound I have sound for a while, until after a random time it falls back to the underlying device, which makes sound disappear. When I use HDA Intel (STAC92xx Analog), it falls back immediately on logging in and the other choices do never fall back, but when I use them, I have no sound at all. After I loose sound when Esound falls back to another device, sometimes writing sudo /etc/rc.d/alsa restart gives sound back, but mostly I need to relog/restart the X-Server to get sound back.
Is my issue related to the original poster his problem? And how can I fix it?

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