Hi Mark
On Tue, Feb 3, 2026 at 7:49 PM Mark Cave-Ayland
<[email protected]> wrote:
>
> On 23/01/2026 07:49, [email protected] wrote:
>
> > From: Marc-André Lureau <[email protected]>
> >
> > Signed-off-by: Marc-André Lureau <[email protected]>
> > ---
> > qemu-options.hx | 22 +++++++++++++++-------
> > 1 file changed, 15 insertions(+), 7 deletions(-)
> >
> > diff --git a/qemu-options.hx b/qemu-options.hx
> > index 455b8be8903..732934a6fa8 100644
> > --- a/qemu-options.hx
> > +++ b/qemu-options.hx
> > @@ -896,11 +896,16 @@ DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
> > QEMU_ARCH_ALL)
> > SRST
> > ``-audiodev [driver=]driver,id=id[,prop[=value][,...]]``
> > - Adds a new audio backend driver identified by id. There are global
> > - and driver specific properties. Some values can be set differently
> > - for input and output, they're marked with ``in|out.``. You can set
> > - the input's property with ``in.prop`` and the output's property with
> > - ``out.prop``. For example:
> > + Adds a new audio backend driver identified by id.
> > +
> > + If no audio backend is specified, QEMU will attempt to select a
> > + default one. The ``-display`` option may influence which backend is
> > + selected.
> > +
> > + There are global and driver specific properties. Some values can be
> > + set differently for input and output, they're marked with ``in|out.``.
> > + You can set the input's property with ``in.prop`` and the output's
> > + property with ``out.prop``. For example:
> >
> > ::
> >
> > @@ -2172,8 +2177,11 @@ DEF("display", HAS_ARG, QEMU_OPTION_display,
> > , QEMU_ARCH_ALL)
> > SRST
> > ``-display type``
> > - Select type of display to use. Use ``-display help`` to list the
> > available
> > - display types. Valid values for type are
> > + Select type of display to use. This may also influence the default
> > + audio backend selection.
> > +
> > + Use ``-display help`` to list the available display types. Valid values
> > + for type are
> >
> > ``spice-app[,gl=on|off]``
> > Start QEMU as a Spice server and launch the default Spice client
>
> The documentation changes look fine in terms of describing how one
> option may influence the other, however there is no explicit mention in
> the documentation that selecting a dbus display with no audio backend
> will also use dbus for audio.
>
> Is it possible to mention this somewhere? Otherwise someone would have
> to go digging through the code to figure this out.
would something like that help?
@@ -2191,6 +2192,9 @@ SRST
``dbus``
Export the display over D-Bus interfaces. (Since 7.0)
+ When no audio backend is specified, the dbus audio backend is used
+ by default.
+
--
Marc-André Lureau
