Difference between revisions of "Enabling nForce4 optical SPDIF output"
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Go to '''Utilities/Setup -> Setup -> General''' and for '''Audio output device''' put '''ALSA:digital'''. | Go to '''Utilities/Setup -> Setup -> General''' and for '''Audio output device''' put '''ALSA:digital'''. | ||
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[[Category:HOWTO]] | [[Category:HOWTO]] | ||
[[Category:asoundrc]] | [[Category:asoundrc]] | ||
Revision as of 17:51, 15 August 2006
Background
Many users with Nvidia4 based motherboards have problems enabling the optical audio output from their motherboard in linux. The default values set by the alsa driver do not enable the optical output, and it is not possible to enable it using the alsamixer.
A solution was found by changing the /etc/asound.state file directly.
Short howto:
- save the asound.state file below as "/etc/asound.state"
- Enter the command "alsactl restore"
- Due to differences in the alsa driver and the support circuts you might experience error messages of the following kind:
- alsactl: set_control:894: warning: name mismatch (Mic Boost (+20dB)/Mic Boost (+20dB) Capture Switch) for control #17
- alsactl: set_control:896: warning: index mismatch (0/0) for control #17
- alsactl: set_control:898: failed to obtain info for control #17 (Operation not permitted)
- alsactl: set_control:894: warning: name mismatch (Mic Boost (+20dB)/Mic Boost (+20dB) Capture Switch) for control #17
- This means that on your hardware, the name of control #17 is not "Mic Boost (+20dB)" but instead "Mic Boost (+20dB) Capture Switch".
- To fix this problem, edit the /etc/asound.state file and change the name of control to the correct name.
- Due to differences in the alsa driver and the support circuts you might experience error messages of the following kind:
- 3. Fix any problems in the asound.state file as described above.
- 4. Test your setup by playing an audio file while using the optical output. The optical output should now be able to output regular stereo and surround depending on your audio source.
/etc/asound.state File
Save the following file as /etc/asound.state
state.CK804 {
control.1 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Master Playback Switch'
value true
}
control.2 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 31'
iface MIXER
name 'Master Playback Volume'
value.0 22
value.1 22
}
control.3 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Center Playback Switch'
value false
}
control.4 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 31'
iface MIXER
name 'Center Playback Volume'
value 31
}
control.5 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'LFE Playback Switch'
value true
}
control.6 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 31'
iface MIXER
name 'LFE Playback Volume'
value 13
}
control.7 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 2
iface MIXER
name 'Surround Playback Switch'
value.0 false
value.1 false
}
control.8 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 31'
iface MIXER
name 'Surround Playback Volume'
value.0 0
value.1 0
}
control.9 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Master Mono Playback Switch'
value false
}
control.10 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 31'
iface MIXER
name 'Master Mono Playback Volume'
value 0
}
control.11 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'PC Speaker Playback Switch'
value false
}
control.12 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 15'
iface MIXER
name 'PC Speaker Playback Volume'
value 0
}
control.13 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Phone Playback Switch'
value false
}
control.14 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 31'
iface MIXER
name 'Phone Playback Volume'
value 0
}
control.15 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Mic Playback Switch'
value false
}
control.16 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 31'
iface MIXER
name 'Mic Playback Volume'
value 0
}
control.17 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Mic Boost (+20dB) Capture Switch'
value false
}
control.18 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Line Playback Switch'
value false
}
control.19 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 31'
iface MIXER
name 'Line Playback Volume'
value.0 0
value.1 0
}
control.20 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'CD Playback Switch'
value false
}
control.21 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 31'
iface MIXER
name 'CD Playback Volume'
value.0 0
value.1 0
}
control.22 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Aux Playback Switch'
value false
}
control.23 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 31'
iface MIXER
name 'Aux Playback Volume'
value.0 0
value.1 0
}
control.24 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'PCM Playback Switch'
value true
}
control.25 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 31'
iface MIXER
name 'PCM Playback Volume'
value.0 22
value.1 22
}
control.26 {
comment.access 'read write'
comment.type ENUMERATED
comment.count 2
comment.item.0 Mic
comment.item.1 CD
comment.item.2 Video
comment.item.3 Aux
comment.item.4 Line
comment.item.5 Mix
comment.item.6 'Mix Mono'
comment.item.7 Phone
iface MIXER
name 'Capture Source'
value.0 Mic
value.1 Mic
}
control.27 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Capture Switch'
value true
}
control.28 {
comment.access 'read write'
comment.type INTEGER
comment.count 2
comment.range '0 - 15'
iface MIXER
name 'Capture Volume'
value.0 0
value.1 0
}
control.29 {
comment.access 'read write'
comment.type ENUMERATED
comment.count 1
comment.item.0 Mix
comment.item.1 Mic
iface MIXER
name 'Mono Output Select'
value Mix
}
control.30 {
comment.access 'read write'
comment.type ENUMERATED
comment.count 1
comment.item.0 Mic1
comment.item.1 Mic2
iface MIXER
name 'Mic Select Capture Switch'
value Mic1
}
control.31 {
comment.access read
comment.type IEC958
comment.count 1
iface MIXER
name 'IEC958 Playback Con Mask'
value '0fff000f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
}
control.32 {
comment.access read
comment.type IEC958
comment.count 1
iface MIXER
name 'IEC958 Playback Pro Mask'
value cf00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
}
control.33 {
comment.access 'read write'
comment.type IEC958
comment.count 1
iface MIXER
name 'IEC958 Playback Default'
value '0082000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
}
control.34 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'IEC958 Playback Switch'
value true
}
control.35 {
comment.access 'read write'
comment.type INTEGER
comment.count 1
comment.range '0 - 3'
iface MIXER
name 'IEC958 Playback AC97-SPSA'
value 0
}
control.36 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Duplicate Front'
value false
}
control.37 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'Mic Front Input Switch'
value false
}
control.38 {
comment.access 'read write'
comment.type ENUMERATED
comment.count 1
comment.item.0 Shared
comment.item.1 Independent
iface MIXER
name 'Surround Jack Mode'
value Shared
}
control.39 {
comment.access 'read write'
comment.type ENUMERATED
comment.count 1
comment.item.0 '2ch'
comment.item.1 '4ch'
comment.item.2 '6ch'
iface MIXER
name 'Channel Mode'
value '2ch'
}
control.40 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'IEC958 Capture Switch'
value false
}
control.41 {
comment.access 'read write'
comment.type ENUMERATED
comment.count 1
comment.item.0 PCM
comment.item.1 'Analog In'
comment.item.2 'IEC958 In'
iface MIXER
name 'IEC958 Playback Source'
value PCM
}
control.42 {
comment.access 'read write'
comment.type BOOLEAN
comment.count 1
iface MIXER
name 'External Amplifier'
value true
}
}
MythTV Setup
Now, once the file is saved start/restart mythfrontend.
Go to Utilities/Setup -> Setup -> General and for Audio output device put ALSA:digital.
