No multichannel audio with HDMI ?

I have all my devices (PS3, PC, another philips dvd player) connected to tv with hdmi 1.4 cables.

From tv i use optical out to my amplifier.
Every other device is working great.
I get multichannel audio fine for my amplifier, but not from bdp5200.
All i get is stereo PCM 48khz (says my amp).
When video plauback if i press audio on remote it shows 5.1 multichannel audio.

From settings i have hdmi audio set to bitstream.
From bdp5200 coaxial out i get multichannel audio, but thats not how i want it to be.

So why dont i get multichannel audio with hdmi?
And how to fix it?

Thanks.

Hi,

which firmware is installed on your BDP, which TV do you have?

Search the forum for dolby passthrough...

Toengel@Alex

I have tried firmwares 1.16. 1.35, 1.52 and 1.55.
Tv is 2 years old samsung, dont remember the model, but every other device is working fine with the setup i described.
Multichannel audio is being passed through to my amplifier.

Edit:
I have tried to playback dvd:s and Blurays, but mostly plain .avi:s with ac3 audio or .mkv:s with multichannel audio.

The .avis etc are not copy protected or anything.
Dont care about blurays too much. Mostly just watching .avis with ac3 or .mkv:s

Since all other devices are working, my tv must be able to pass through digital audio.