Re: audio output via DP/hdmi over jack only after restarting xserver?

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try -d alsa -dhw:0,3

On Tue, May 26, 2026 at 4:29=E2=80=AFPM Peter P. <peterparker-97jfqw80gc5Wk0Htik3J/[email protected]>=
 wrote:

> Hi list,
>
> I sometimes connect a miniDisplayPort to HDMI adaptor with an X230
> thinkpad. In order to output audio via this connection using jack I have
> to restart my Xserver (means: logging out and back into X).
>
> Here is how I am trying to debug this, first listing the respective
> output (card 0, device 0):
> $ aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
>   Subdevices: 0/1
>   Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
>
> I can start jackd with this output, its options being
> $ jackd -v -t2000 -dalsa -dhw:0 -r48000 -p512 -n3 -Xseq -D -Phw:PCH,3 -i2
> -o2
> although there is no monitor connected to this output.
>
> $ cat /proc/asound/card0/pcm3p/sub0/status
> shows the device as running after jackd start.
>
> Next step: Connecting an external HDMI monitor via a miniDisplayPort
> adapter to the
> laptop, this makes xrandr show that HDMI1 is connected.
>
> Enabling the monitor output via xrandr will make aplay -l lists the
> monitor model as well:
> card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [DELL U2410]
>
> Playing back audio will not output sound.
> If I exit my Xsession and log back in, while jackd keeps running, audio
> output suddenly works, and I have no idea why.
>
> I often have to switch back and forth between HDMI audio and other
> outputs but having to log out and back into X is quite cumbersome.
>
> If anyone has any ideas how I can got about debugging/fixing this
> further, I'd be glad to hear!
>
> best, Peter
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif">try -d alsa -dhw:0,3</div></div><br><div class=3D"gmail=
_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Tue,=
 May 26, 2026 at 4:29=E2=80=AFPM Peter P. &lt;<a href=3D"mailto:peterparker=
@fastmail.com">peterparker-97jfqw80gc5Wk0Htik3J/[email protected]</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">Hi list,<br>
<br>
I sometimes connect a miniDisplayPort to HDMI adaptor with an X230<br>
thinkpad. In order to output audio via this connection using jack I have<br=
>
to restart my Xserver (means: logging out and back into X). <br>
<br>
Here is how I am trying to debug this, first listing the respective<br>
output (card 0, device 0):<br>
$ aplay -l <br>
**** List of PLAYBACK Hardware Devices ****<br>
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]<br=
>
=C2=A0 Subdevices: 1/1<br>
=C2=A0 Subdevice #0: subdevice #0<br>
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]<br>
=C2=A0 Subdevices: 0/1<br>
=C2=A0 Subdevice #0: subdevice #0<br>
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]<br>
=C2=A0 Subdevices: 1/1<br>
=C2=A0 Subdevice #0: subdevice #0<br>
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]<br>
<br>
I can start jackd with this output, its options being<br>
$ jackd -v -t2000 -dalsa -dhw:0 -r48000 -p512 -n3 -Xseq -D -Phw:PCH,3 -i2 -=
o2<br>
although there is no monitor connected to this output.<br>
<br>
$ cat /proc/asound/card0/pcm3p/sub0/status <br>
shows the device as running after jackd start.<br>
<br>
Next step: Connecting an external HDMI monitor via a miniDisplayPort adapte=
r to the<br>
laptop, this makes xrandr show that HDMI1 is connected.<br>
<br>
Enabling the monitor output via xrandr will make aplay -l lists the<br>
monitor model as well:<br>
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [DELL U2410]<br>
<br>
Playing back audio will not output sound.<br>
If I exit my Xsession and log back in, while jackd keeps running, audio<br>
output suddenly works, and I have no idea why.<br>
<br>
I often have to switch back and forth between HDMI audio and other<br>
outputs but having to log out and back into X is quite cumbersome.<br>
<br>
If anyone has any ideas how I can got about debugging/fixing this<br>
further, I&#39;d be glad to hear!<br>
<br>
best, Peter<br>
</blockquote></div>

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