1.3 KiB
1.3 KiB
Kernel 5.10.x (armhf_test)
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 Replace /usr/share/alsa/cards/vc4-hdmi.conf with the contents here:
# Configuration for the VC4-HDMI sound card using software IEC958
# subframe conversion
<confdir:pcm/hdmi.conf>
vc4-hdmi.pcm.hdmi.0 {
@args [ CARD AES0 AES1 AES2 AES3 ]
@args.CARD {
type string
}
@args.AES0 {
type integer
}
@args.AES1 {
type integer
}
@args.AES2 {
type integer
}
@args.AES3 {
type integer
}
type iec958
slave {
format IEC958_SUBFRAME_LE
pcm {
type hooks
slave.pcm {
type hw
card $CARD
device 0
}
hooks.0 {
type ctl_elems
hook_args [
{
name "IEC958 Playback Default"
optional true
lock true
preserve true
value [ $AES0 $AES1 $AES2 $AES3 ]
}
]
}
}
}
status [ $AES0 $AES1 $AES2 $AES3 ]
}
# default with plug
vc4-hdmi.pcm.default {
@args [ CARD ]
@args.CARD {
type string
}
type plug
slave.pcm {
type softvol
slave.pcm {
@func concat
strings [ "hdmi:" $CARD ]
}
control {
name "PCM Playback Volume"
card $CARD
}
}
}
and you should havea new alsa device. (Only available when running with dtoverlay=vc4-kms-v3d).