5.1 on HDMI with a splitter

[potuz]

Hello, I need some help setting a surround system.

I have the displayport output hooked to an HDMI -> HDMI + Toslink spitter connected.

The toslink goes to an old Onkyo that can receive 7.1 direct pcm or AC3, DTS, etc.
The HDMI is hooked to a Samsung TV. One problem I can see is that Samsung responds to the HDMI so the card believes it has only two channels:

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$ cat /proc/asound/card0/eld#0.0 
monitor_present		1
eld_valid		1
monitor_name		SAMSUNG
connection_type		HDMI
eld_version		[0x2] CEA-861D or below
edid_version		[0x3] CEA-861-B, C or D
manufacture_id		0x2d4c
product_id		0x659
port_id			0x0
support_hdcp		0
support_ai		1
audio_sync_delay	0
speakers		[0x1] FL/FR
sad_count		1
sad0_coding_type	[0x1] LPCM
sad0_channels		2
sad0_rates		[0xe0] 32000 44100 48000
sad0_bits		[0xe0000] 16 20 24

Since it only sees 2 channels then the speaker test would only test FL,FR. IF I try with 6:

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 $ pasuspender -- speaker-test -c 6 -t w -D hw:0,3

speaker-test 1.1.6

Playback device is hw:0,3
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
Channels count (6) not available for playbacks: Invalid argument
Setting of hwparams failed: Invalid argument

I can try with plughw 0,3 but then it would only use 2 channels anyway.

If I use pulseaudio I set up

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default-sample-channels=6

and then playing a 5.1 file sound only comes from FL,FR.

How do I set this up?