78 lines
1.3 KiB
Markdown
78 lines
1.3 KiB
Markdown
#### Kernel 5.10.x (armhf_test)
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KMS also comes with its own arm-side HDMI audio driver. If you want to test this, then remove dtparam=audio=on from config.txt
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Replace /usr/share/alsa/cards/vc4-hdmi.conf with the contents here:
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```
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# Configuration for the VC4-HDMI sound card using software IEC958
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# subframe conversion
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<confdir:pcm/hdmi.conf>
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vc4-hdmi.pcm.hdmi.0 {
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@args [ CARD AES0 AES1 AES2 AES3 ]
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@args.CARD {
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type string
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}
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@args.AES0 {
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type integer
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}
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@args.AES1 {
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type integer
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}
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@args.AES2 {
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type integer
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}
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@args.AES3 {
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type integer
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}
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type iec958
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slave {
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format IEC958_SUBFRAME_LE
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pcm {
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type hooks
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slave.pcm {
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type hw
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card $CARD
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device 0
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}
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hooks.0 {
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type ctl_elems
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hook_args [
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{
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name "IEC958 Playback Default"
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optional true
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lock true
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preserve true
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value [ $AES0 $AES1 $AES2 $AES3 ]
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}
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]
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}
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}
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}
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status [ $AES0 $AES1 $AES2 $AES3 ]
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}
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# default with plug
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vc4-hdmi.pcm.default {
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@args [ CARD ]
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@args.CARD {
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type string
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}
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type plug
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slave.pcm {
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type softvol
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slave.pcm {
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@func concat
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strings [ "hdmi:" $CARD ]
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}
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control {
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name "PCM Playback Volume"
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card $CARD
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}
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}
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}
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```
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and you should havea new alsa device. (Only available when running with dtoverlay=vc4-kms-v3d).
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