[alsa-devel] [PATCH v2] ALSA: hdmi: expose ELD control

[Stephen Warren]

Pierre-Louis Bossart wrote at Tuesday, September 27, 2011 9:49 AM:
...
> > Set the access field to SNDRV_CTL_ELEM_ACCESS_READ.
> > Also, unless we implement a notification, better to set
> > SNDRV_CTL_ELEM_ACCESS_VOLATILE flag, too.
> 
> The intent was to read the ELD after the device is opened, I don't think the
> ELD can change during playback, the updates can only happen on a pin-sensing
> event. I can't think of a good reason why a notification would be needed?

If the user unplugs an HDMI monitor and plugs a different one in, and
hence the X server turns off the output and re-enables it to cater for
any required new display mode, would that force the audio client to
close/re-open the audio device? I don't /think/ so. As such, I guess
the ELD can change dynamically, so notification would be a good idea.

-- 
nvpublic