Bug 81924

Summary:	No Audio over DisplayPort
Product:	DRI	Reporter:	Stefan Brüns <stefan.bruens>
Component:	DRM/Radeon	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED MOVED	QA Contact:
Severity:	enhancement
Priority:	medium
Version:	DRI git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Stefan Brüns 2014-07-30 16:52:08 UTC

Currently audio is not supported when DP is used for connecting the monitor.

This works if the monitor is connected using HDMI, or when fglrx is used.

I tried patching the driver with hardcoded values taken from the fglrx drivers using radeontool, unfortunately, this was not sufficient.

1. added call in atombios_encoders.c:radeon_atom_encoder_mode_set(...) to initialize audio when encoder mode is DP.
2. patched evergreen_hdmi.c:evergreen_hdmi_enable(...) and evergreen_hdmi_setmode(...) to set same register values as fglrx.
3. patched dce6_afmt.c to set values matching fglrx.

Something is missing here ...

Comment 1 Jürgen Scholz 2016-03-15 14:12:21 UTC

I am trying to use a displayport connection between a Tahiti XT R9 280X and my monitor to output audio.

The initial report seems still valid: Using HDMI for audio works with the same monitor and it does not with displayport.

Running aplay -D plughw:0,$i does not lead to audible sound. No error messages though.

Trying to force audio on with xrandr --output DisplayPort-0 --set audio on does not work either.

Comment 2 Martin Peres 2019-11-19 08:54:02 UTC

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