As requested in 
https://lists.ubuntu.com/archives/ubuntu-devel/2009-July/028606.html, I 
installed the test kernel on a Dell Latitude E6400 (Codec: IDT 92HD71B7X).
The popping sound seems to be gone with that kernel.

$ cat /sys/module/snd_hda_intel/parameters/power_save
10
$ cat /sys/module/snd_hda_intel/parameters/power_save_controller
Y

linux-image-2.6.31-4-generic:
  Installed: 2.6.31-4.23~crimsun1powerdown1
  Candidate: 2.6.31-4.23
  Version table:
     2.6.31-4.23 0
        500 http://de.archive.ubuntu.com karmic/main Packages
 *** 2.6.31-4.23~crimsun1powerdown1 0
        100 /var/lib/dpkg/status

-- 
[9.10 regression] HDA power_save=10
https://bugs.launchpad.net/bugs/381693
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