On 31. 03. 23 17:30, Takashi Iwai wrote:
That said, the slot preservation becomes effective only when multiple
devices are connected and they are on/off at the same time. In such a
case, the device order may be changed at each screen on/off with the
current code, while this patch allows keeping the order. Maybe I
should emphasize about the multiple devices in the patch description.
I though about possibility to remove a monitor completely. Then you can have a
gap in the PCM device list.
The sound server should combine the persistent path only from the ELD
information for the HDMI devices (if present). The problem may be when
multiple similar monitors are connected to the machine. It would be
probably nice to have an unique PCM device name for this usage with
the serial number of the connected monitor (but I don't think it's in
ELD? - it is in the EDID spec thought).
The name string appears actually in the dialog. But the automatic
switch doesn't happen. So we need some improvement / fix.
The switch does not happen because PA/PW use the sink/output path which use
the ALSA PCM device identification. This sink/output path also identifies the
volume/port preservation. It is not ideal for the hotplug audio devices like
HDMI, so we should have another way to identify those devices. The ALSA's PCM
name / subdevice name fields in the info structure may be usable for this.
Jaroslav
--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
