I posted a while back about not getting correct surround sound with my
cmedia 8738 card. Since no one replied to my post, or to a couple other
posts about the same problem that i found when digging through the
archives, i will ask again.
When I try to use more than 2 channels I get very distorted sound out of
the front speakers of my 5.1 set up. This is universal with mplayer,
xine, ac3dec, and the pcm test program. Specifically, running
# pcm -r 44100 -c 6 -D surround51 -m direct_interleaved
produces sound of ~140hz with lots of popping.
I found a post on the xine mailinglist:
http://sourceforge.net/mailarchive/message.php?msg_id=1471546
that suggested there is a problem with the buffer size, but running
/test/pcm with different -b values did not solve the problem. Some help
would be greatly appreciated.
~Dan
Here is a # cat /proc/asound/card0/cmicpi
while running # pcm -r 44100 -c 6 -D surround51 -m direct_interleaved
C-Media PCI CMI8738-MC6 (model 55) at 0xe000, irq 10
00: 02 00 01 00
04: 44 0c 00 00
08: 03 00 09 80
0c: 00 00 01 08
10: c0 00 00 00
14: 00 80 80 80
18: 80 00 89 00
1c: f0 6f fe ff
20: 10 40 c8 00
24: 03 0f 00 00
28: ff ff ff ff
2c: ff ff ff ff
30: 00 00 00 00
34: 00 00 00 00
38: 00 00 00 00
3c: 00 00 00 00
# cat /proc/asound/card0/pcm0p/sub0/hw_params
access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 6
rate: 44100 (44100/1)
period_size: 2730
buffer_size: 5461
tick_time: 10000
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