I use kubuntu Feisty Fawn (7.04), 2.6.20-15-generic kernel and alsa version 1.0.13-3ubuntu1, which is the latest in (k)ubuntu repositories.
I had the same problem on different distributions, kernel versions and probably even other alsa versions.
My sound card is NVidia CK8S and the chip is Realtek ALC850 rev 0.
If I run speaker-test -Dsurround51 -c6 -l1 in console, this is what I get:
speaker-test 1.0.13
Playback device is surround51
Stream parameters are 48000Hz, S16_LE, 6 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 3 to 5461
Period size range from 3 to 5461
Using max buffer size 5460
Periods = 4
was set period_size = 1365
was set buffer_size = 5460
0 - Front Left (I hear voice)
4 - Center (No voice)
1 - Front Right (I hear voice)
3 - Rear Right (No voice)
2 - Rear Left (No voice)
5 - LFE (No voice)
Time per period = 17,802158
Yes, I have 5.1 sound system. And it all works well in windows.
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