I have an issue with playing back through the IEC958 interface of my ATI IXP sound card. I believe the relevant information on my setup is below.
# uname -a
Linux HTPC 2.6.28-14-generic #47-Ubuntu SMP Sat Jul 25 00:28:35 UTC 2009 i686 GNU/Linux
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: IXP [ATI IXP], device 0: ATI IXP AC97 [ATI IXP AC97]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: IXP [ATI IXP], device 1: ATI IXP IEC958 [ATI IXP IEC958 (AC97)]
Subdevices: 1/1
Subdevice #0: subdevice #0
# aplay -L
default:CARD=IXP
ATI IXP, ATI IXP AC97
Default Audio Device
front:CARD=IXP,DEV=0
ATI IXP, ATI IXP AC97
Front speakers
surround40:CARD=IXP,DEV=0
ATI IXP, ATI IXP AC97
4.0 Surround output to Front and Rear speakers
surround41:CARD=IXP,DEV=0
ATI IXP, ATI IXP AC97
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=IXP,DEV=0
ATI IXP, ATI IXP AC97
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=IXP,DEV=0
ATI IXP, ATI IXP AC97
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
iec958:CARD=IXP,DEV=0
ATI IXP, ATI IXP IEC958 (AC97)
IEC958 (S/PDIF) Digital Audio Output
null
Discard all samples (playback) or generate zero samples (capture)
# speaker-test -c2 -l1 -Dhw:0,1
speaker-test 1.0.20
Playback device is hw:0,1
Stream parameters are 48000Hz, S16_LE, 2 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 16 to 16384
Period size range from 8 to 8192
Using max buffer size 16384
Periods = 4
was set period_size = 4096
was set buffer_size = 16384
0 - Front Left
Write error: -5,Input/output error
xrun_recovery failed: -5,Input/output error
Transfer failed: Operation not permitted
# amixer
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined cswitch cswitch-joined
Playback channels: Mono
Capture channels: Mono
Mono: Playback [on] Capture [off]
Simple mixer control 'IEC958 Playback AC97-SPSA',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 3
Mono: 0 [0%]
Simple mixer control 'IEC958 Playback Source',0
Capabilities: enum
Items: 'PCM' 'Analog1 In' 'Analog2 In' 'IEC958 In'
Item0: 'PCM'
I have checked that all the modules are loaded etc. but for the life of me I cannot get even a peep to come out of the IEC958 channel. After searching around I have seen that this problem has been experienced by other people but I could find no obvious solution. I'm running alsa 1.0.22.1 if that helps and I have also tried switching between direct SPDIF and ac-link.
Many thanks in advance,
Ben Langley
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