Mailing List Archive

On Wed, 31 Jan 2024 15:05:45 +0800, you wrote:

>The lack of VU control does not happen on other monitors!
>
>I?m using a SAMSUNG LS32A700NWEXXY 32INCH S7 4K monitor. I am trying to not use a USB-audio-line-out (which works fine) but use the monitor headphone output.
>
>All is fine except I have NO VU control. I have tried pulse and alsa controls (where the slider moves) but it has no effect on volume.
>Wunse-upon-a-time I?m sure I recall ?myth internal volume control? It seems to be gone. Currently vol [adjusting the mixer] from 0..100% has no effect.
>
>I can turn the speaker volume knob but I?d prefer local control. Any opinions ?
>
>Thanks
>James

So is the audio going to the monitor on the HDMI connection? If so,
then you need the volume controls for the HDMI audio device, not the
motherboard audio device. In alsamixer, use F6 and select the HDMI
device.

Then in the mythfrontend audio settings, you normally need to set it
to use one of the ALSA HDMI devices, rather than ALSA:Default or
PulseAudio. Or you can craft a /etc/asound.conf file to send the
audio to multiple devices at once, so it goes to HDMI and the
motherboard audio at the same time. I do that for my MythTV box, but
I long ago uninstalled PulseAudio, so it may not work the same for
you. This is what I have, which sends the sound out the motherboard
IEC958 (S/PDIF) port and the Nvidia HDMI audio port. Of course, the
names and numbers (CARD and DEV) will differ for your hardware. I do
not actually understand how ALSA works - I made this file by copying
from various examples and a fair bit of trial and error.

root@mypvr:/etc# cat asound.conf
pcm.!default {
type hw
card Generic
}

ctl.!default {
type hw
card Generic
}


##############################################################################
# Create an alsa device that sends audio to both the onboard IEC958
(S/PDIF)
# output and the Nvidia graphics card HDMI output.

# First, create a dual device that combines the onboard IEC958 device
and the
# Nvidia HDMI device into one 4 channel device.
pcm.dual {
type multi
slaves.a.pcm "plughw:CARD=Generic,DEV=1" # IEC958 S/PDIF output
slaves.a.channels 2
slaves.b.pcm "plughw:CARD=NVidia,DEV=3"
slaves.b.channels 2

bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}

# Now create a two channel device that routes its source channels to
the
# destination channels on the dual device.
pcm.both {
type route
slave.pcm "dual"

ttable.0.0 1 #Left input to onboard IEC958 left output
ttable.1.1 1 #Right input to onboard IEC958 right output
ttable.0.2 1 #Left input to Nvidia HDMI left output
ttable.1.3 1 #Right input to Nvidia HDMI right output
}
##############################################################################
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> On Jan 31, 2024, at 15:41, Stephen Worthington <stephen_agent@jsw.gen.nz> wrote:
>
> On Wed, 31 Jan 2024 15:05:45 +0800, you wrote:
>
>> The lack of VU control does not happen on other monitors!
>>
>> I?m using a SAMSUNG LS32A700NWEXXY 32INCH S7 4K monitor. I am trying to not use a USB-audio-line-out (which works fine) but use the monitor headphone output.
>>
>> All is fine except I have NO VU control. I have tried pulse and alsa controls (where the slider moves) but it has no effect on volume.
>> Wunse-upon-a-time I?m sure I recall ?myth internal volume control? It seems to be gone. Currently vol [adjusting the mixer] from 0..100% has no effect.
>>
>> I can turn the speaker volume knob but I?d prefer local control. Any opinions ?
>>
>> Thanks
>> James
>
> So is the audio going to the monitor on the HDMI connection? If so,
> then you need the volume controls for the HDMI audio device, not the
> motherboard audio device. In alsamixer, use F6 and select the HDMI
> device.

Under ALSAMIXER there is no hdmi device, yet the sound, without vu control comes out the monitor headphone socket.
With another monitor, ASUS, there IS a hdmi sound device and the level can be changed

The USB sound dongle was $10 so I’ll mutter the rude word, beeep, and keep using it, where all is works as expected

Thanks
James


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Presumably the first monitor is not detected as having an hdmi audio
capability? Does it have built in speakers?

On Fri, 2 Feb 2024 at 05:51, James Linder <jam@tigger.ws> wrote:

>
>
> > On Jan 31, 2024, at 15:41, Stephen Worthington <stephen_agent@jsw.gen.nz>
> wrote:
> >
> > On Wed, 31 Jan 2024 15:05:45 +0800, you wrote:
> >
> >> The lack of VU control does not happen on other monitors!
> >>
> >> I’m using a SAMSUNG LS32A700NWEXXY 32INCH S7 4K monitor. I am trying to
> not use a USB-audio-line-out (which works fine) but use the monitor
> headphone output.
> >>
> >> All is fine except I have NO VU control. I have tried pulse and alsa
> controls (where the slider moves) but it has no effect on volume.
> >> Wunse-upon-a-time I’m sure I recall ‘myth internal volume control’ It
> seems to be gone. Currently vol [adjusting the mixer] from 0..100% has no
> effect.
> >>
> >> I can turn the speaker volume knob but I’d prefer local control. Any
> opinions ?
> >>
> >> Thanks
> >> James
> >
> > So is the audio going to the monitor on the HDMI connection? If so,
> > then you need the volume controls for the HDMI audio device, not the
> > motherboard audio device. In alsamixer, use F6 and select the HDMI
> > device.
>
> Under ALSAMIXER there is no hdmi device, yet the sound, without vu control
> comes out the monitor headphone socket.
> With another monitor, ASUS, there IS a hdmi sound device and the level can
> be changed
>
> The USB sound dongle was $10 so I’ll mutter the rude word, beeep, and
> keep using it, where all is works as expected
>
> Thanks
> James
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org
>

On 2/2/24 00:49, James Linder wrote:
>
>> On Jan 31, 2024, at 15:41, Stephen Worthington <stephen_agent@jsw.gen.nz> wrote:
>>
>> On Wed, 31 Jan 2024 15:05:45 +0800, you wrote:
>>
>>> The lack of VU control does not happen on other monitors!
>>>
>>> I?m using a SAMSUNG LS32A700NWEXXY 32INCH S7 4K monitor. I am trying to not use a USB-audio-line-out (which works fine) but use the monitor headphone output.
>>>
>>> All is fine except I have NO VU control. I have tried pulse and alsa controls (where the slider moves) but it has no effect on volume.
>>> Wunse-upon-a-time I?m sure I recall ?myth internal volume control? It seems to be gone. Currently vol [adjusting the mixer] from 0..100% has no effect.
>>>
>>> I can turn the speaker volume knob but I?d prefer local control. Any opinions ?
>>>
>>> Thanks
>>> James
>> So is the audio going to the monitor on the HDMI connection? If so,
>> then you need the volume controls for the HDMI audio device, not the
>> motherboard audio device. In alsamixer, use F6 and select the HDMI
>> device.
> Under ALSAMIXER there is no hdmi device, yet the sound, without vu control comes out the monitor headphone socket.
> With another monitor, ASUS, there IS a hdmi sound device and the level can be changed
>
> The USB sound dongle was $10 so I’ll mutter the rude word, beeep, and keep using it, where all is works as expected
>
> Thanks
> James
>
>
> _______________________________________________
I remember having some oddity long ago that was similar. Played with alsa utilities to figure out which output to use, as one output acted like a fixed line out, the other worked through the mixer. Can't recall specifics now, it was quite long ago.
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