here i am again, sorry for log delay.
i have to revert my last post, which says that the problem is fixed.
>> IT IS NOT. <<

i can reproduce it on my two pcs, samsung-nc10 and shuttle, both with:
$ cat /proc/asound/card0/codec#* | grep Codec
Codec: Realtek ALC662 rev1

i got the latest patches and alsa from the audio-dev-team
fix_position and/or forcing model=xxx don't help!!

so i found: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/574137
in my opinion *IT IS* the same problem

i think it it not a configuration problem.
it seems to be a problem with the alsa-diver for my crappy on-board-sound-card.

it fails if i *seek the volume* OR *jump in a track*, that must be a problem with the sound-buffer-software-seeking
a saw the talk with lennard pöttering on linux audo conference and he said that exactly this is hard to code.

i have this stuff in my syslog:
May  7 21:17:56 infrared kernel: [   28.801754] ALSA hda_intel.c:1665: azx_pcm_prepare: bufsize=0x3700, format=0x4011
May  7 21:17:56 infrared kernel: [   28.801782] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x9, stream=0x1, channel=0, format=0x4011
May  7 21:17:56 infrared kernel: [   28.812527] ALSA hda_intel.c:1665: azx_pcm_prepare: bufsize=0x3700, format=0x4011
May  7 21:17:56 infrared kernel: [   28.812550] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x9, stream=0x1, channel=0, format=0x4011
May  7 21:17:56 infrared pulseaudio[1486]: alsa-util.c: Disabling timer-based scheduling because high-resolution timers are not available from the kernel.
May  7 21:17:56 infrared kernel: [   28.832634] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x9
May  7 21:17:56 infrared kernel: [   28.832772] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x9
May  7 21:17:56 infrared kernel: [   28.843946] ALSA hda_intel.c:1665: azx_pcm_prepare: bufsize=0x3700, format=0x4011
May  7 21:17:56 infrared kernel: [   28.843976] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x2, stream=0x5, channel=0, format=0x4011
May  7 21:17:56 infrared kernel: [   28.862383] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x4, stream=0x5, channel=0, format=0x4011
May  7 21:17:56 infrared kernel: [   28.883255] ALSA hda_intel.c:1665: azx_pcm_prepare: bufsize=0x3700, format=0x4011
May  7 21:17:56 infrared kernel: [   28.883283] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x2, stream=0x5, channel=0, format=0x4011
May  7 21:17:56 infrared kernel: [   28.902356] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x4, stream=0x5, channel=0, format=0x4011
May  7 21:17:56 infrared pulseaudio[1486]: alsa-util.c: Disabling timer-based scheduling because high-resolution timers are not available from the kernel.
May  7 21:17:56 infrared kernel: [   28.955728] ALSA hda_intel.c:1665: azx_pcm_prepare: bufsize=0x3700, format=0x4011
May  7 21:17:56 infrared kernel: [   28.955758] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x9, stream=0x1, channel=0, format=0x4011
May  7 21:17:56 infrared kernel: [   28.972364] ALSA hda_intel.c:1665: azx_pcm_prepare: bufsize=0x3700, format=0x4011
May  7 21:17:56 infrared kernel: [   28.972386] ALSA hda_codec.c:1158: hda_codec_setup_stream: NID=0x9, stream=0x1, channel=0, format=0x4011
May  7 21:17:56 infrared pulseaudio[1486]: alsa-sink.c: ALSA woke us up to write new data to the device, but there was actually nothing to write!
May  7 21:17:56 infrared pulseaudio[1486]: alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers.
May  7 21:17:56 infrared pulseaudio[1486]: alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
May  7 21:18:01 infrared kernel: [   34.259219] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x9
May  7 21:18:01 infrared kernel: [   34.259290] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x9
May  7 21:18:01 infrared kernel: [   34.261635] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x2
May  7 21:18:01 infrared kernel: [   34.261651] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x4
May  7 21:18:01 infrared kernel: [   34.261727] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x2
May  7 21:18:01 infrared kernel: [   34.261736] ALSA hda_codec.c:1176: hda_codec_cleanup_stream: NID=0x4

i installed lucid from scratch on my samsung nc10 and this stuff happens, so i think there are other people out there with the same problem

i will follow this thread again,
christian