VESA DisplayPort User manual

VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 1 of 18
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DisplayPort!Audio!User!Guide!
The!DisplayPort!interface!is!used!to!connect!computers!and!displays.!!The!interface!can!include!audio!signals!in!the!same!
cable!as!the!video!signals.!!In!addition,!most!DisplayPort!Sources!(computers)!support!dual?mode,!where!DVI!or!HDMI!
signals!can!be!sent!from!the!DisplayPort!connector!using!a!low?cost!cable!adaptor.!!DisplayPort!dual?mode!Sources!and!
adaptors!may!be!marked!with!the!“DP++”!icon.!
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DisplayPort!dual?mode!icon!
About!this!guide:!
This!guide!provides!information!about!DisplayPort!systems!and!adaptors!for!the!purpose!of!enabling!audio!capabilities.!!
The!information!presented!is!representative!of!typical!computers!and!operating!systems!but!does!not!cover!all!possible!
combinations.!!The!most!up?to?date!information!can!be!obtained!from!the!hardware!manufacturer.!!For!more!
information!about!DisplayPort!visit!www.displayport.org.!!This!guide!is!presented!for!information!only;!no!warranty!or!
fitness!for!use!is!expressed!or!implied.!!VESA!assumes!no!liability!resulting!from!the!use!of!this!information.!

VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 2 of 18
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Contents:!
Enabling!DisplayPort!Audio! 2!
AMD!Example!on!Windows!Vista!and!Windows!7! 3!
Cable!Adaptors!and!HDMI!ID!ROM! 4!
Apple!Example! 6!
Intel,!Windows!XP,!Example! 9!
Nvidia!on!Windows!7!Example!11!
Troubleshooting!14!
FAQ!15!

VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 3 of 18
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Enabling!DisplayPort!Audio!
There!are!three!components!needed!to!enable!DisplayPort!audio:!
A!graphics!output!device!(PC!or!laptop)!that!supports!DisplayPort!audio!and/or!dual?mode!with!audio.!
A!Sink!device!(display)!that!supports!audio!playback.!!For!example,!a!DisplayPort!monitor!with!speakers!or!a!television!
with!HDMI!input!if!using!dual?mode.!
A!dual?mode!cable!adaptor!if!using!a!Sink!device!with!HDMI!input.!
The!graphics!output!device!i.e.!graphics!chip!drives!the!DisplayPort!output.!!That!means!that!the!graphics!device!has!to!
send!the!audio!signals!along!with!the!video!signals.!!The!first!step!in!enabling!audio!is!to!determine!that!the!graphics!
hardware!and!driver!support!this!function.!
In!the!following!examples,!typical!devices!are!shown.!!Your!system!may!have!different!devices.!!For!example,!in!the!
sample!shown!below,!your!system!may!have!other!hardware!instead!of!Conexant!Audio.!
To!determine!if!your!graphics!adaptor!has!an!audio!driver!installed,!follow!these!steps:!
Windows(Vista(and(Windows(7,(AMD(example:(
Check!that!the!latest!graphics!drivers!for!your!system!are!installed!before!proceeding.!
Right?click!the!speaker!icon!in!the!lower!right!corner!of!the!Desktop!and!select!“Playback!Devices”!
:!
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VESA DisplayPort Audio User Guide
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If!no!hardware!or!driver!support!for!DisplayPort!or!dual?mode!audio!is!present,!the!dialog!box!looks!like!this:!
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Note!that!there!is!no!option!for!DP!or!HDMI!output.!!
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VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 5 of 18
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In!the!next!example,!the!hardware!and!driver!do!support!DisplayPort!audio.!!In!the!Sound!dialog!box,!note!that!“ATI!DP!
Output”!is!selected.!!In!this!example,!a!display!that!supports!DisplayPort!audio!is!connected,!and!the!operating!system!
has!automatically!selected!it!as!the!preferred!playback!device.!
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VESA DisplayPort Audio User Guide
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Cable!Adaptors!and!HDMI!ID!ROM!
Cable!Adaptors!that!are!DisplayPort!dual?mode!to!HDMI!should!include!a!device!that!identifies!the!adaptor!as!an!HDMI?
output!device.!!This!device!is!called!the!HDMI!ID!ROM.!!When!a!cable!adaptor!is!attached,!the!graphics!driver!reads!the!
device!to!see!if!the!ID!is!present.!!Some!cable!adaptors!with!HDMI!outputs!do!not!have!this!ID.!!When!that!happens,!the!
graphics!device!assumes!the!adaptor!is!DVI!and!does!not!send!audio!to!it.!!DVI!devices!do!not!support!audio!over!the!DVI!
interface.!
The!following!dialog!box!appears!when!an!AMD!driver!detects!a!cable!adaptor!without!the!HDMI!ID!ROM:!
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In!the!Sound!dialog!box,!the!ATI!DP!Output!shows!“Not!plugged!in”:!

VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 7 of 18
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This!shows!that,!while!the!hardware!and!driver!support!DisplayPort!audio,!there!is!no!display!or!adaptor!with!audio!
connected.!

VESA DisplayPort Audio User Guide
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Apple(Products:(
Check!that!the!system!software!is!up!to!date!before!proceeding.!
Click!the!Apple!icon!(upper!left!corner!of!the!display),!then!System!Preferences,!Sound,!and!click!the!Output!tab:!
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VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 9 of 18
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If!no!hardware!or!driver!support!for!DisplayPort!or!dual?mode!audio!is!present,!the!dialog!box!looks!like!this:!
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Note!that!there!is!no!option!for!DP!or!HDMI!output.!!
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VESA DisplayPort Audio User Guide
©Copyright 2011 Video Electronics Standards Association Page 10 of 18
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In!the!next!example,!the!hardware!and!driver!do!support!DisplayPort!audio!and!a!display!that!supports!DisplayPort!
audio!is!connected.!!Note!that!“Sync!Master”!with!“Type!!DisplayPort”!is!selected.!!The!operating!system!has!
automatically!selected!it!as!the!playback!device.!
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