Now I have found part of a solution.

When I run the following commands for about 20 seconds each, I get back the PCM 
signal and during the speakertest, I can hear the test sound. When I stop the 
test sound the PCM signal is still left (as it should) but I can not play any 
other sterio sounds (like ogg-files for example) thru the PCM signal. If I 
switch to analog output, I hear the sterio sound, so the mediaplayer is 
obviously working.
If I play AC3 or DTS, it works and when I stop the AC3/DTS signal the PCM 
signal swaps back, just as it should (except that it is dead silent).

$ speaker-test -c2 --device cards.pcm.iec958 --rate 44100
$ speaker-test -c2 --device cards.pcm.iec958 --rate 48000

I hope this helps someone! I still need help solving my problem, why my
PCM signal is silent.

-- 
SPDIF won't play PCM after playing AC3
https://bugs.launchpad.net/bugs/25632
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