Alsa Cannot Use 5.1 channel

Hi.
I have tried a lot of different .asoundrc files but nothing of them worked.
Here is the last one
pcm.!default {
type plug
slave.pcm "surround51"
slave.channels 6
route_policy duplicate
also here is the result of aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=V8251
VIA 8251, VIA 8251
Default Audio Device
front:CARD=V8251,DEV=0
VIA 8251, VIA 8251
Front speakers
surround40:CARD=V8251,DEV=0
VIA 8251, VIA 8251
4.0 Surround output to Front and Rear speakers
surround41:CARD=V8251,DEV=0
VIA 8251, VIA 8251
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=V8251,DEV=0
VIA 8251, VIA 8251
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=V8251,DEV=0
VIA 8251, VIA 8251
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
iec958:CARD=V8251,DEV=0
VIA 8251, VIA 8251
IEC958 (S/PDIF) Digital Audio Output
I have unmute all channels from alsamixer too.
What's the problem now ?

What info i didn't post ? Im just telling that i cannot make alsa work with my 5.1 sound system.
Also here is the other .asoundrc file that i ve tried
pcm.ch51dup {
slave.pcm surround51
slave.channels 6
type route
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
ttable.0.4 0.5
ttable.1.4 0.5
ttable.0.5 0.5
ttable.1.5 0.5

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