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[Bug 1504227] [NEW] Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Etienne URBAH <eurbah@xxxxxxx>
Date: Thu, 08 Oct 2015 16:57:56 -0000
Reply-to: Bug 1504227 <1504227@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Public bug reported:

I am using simultaneously :
-  an audio headset connected to the analog audio output,
-  a DisplayPort cable to connect my display to my 'AMD Tahiti XT [Radeon HD 7970 ...]' graphics + sound card.

Using the 'Sound' panel of 'gnome-control-center', I systematically get
following behaviour for sound output :

-  If I choose the 'Line Out - Built-in Audio' device, the sound output comes immediately :
   For example, inside the 'Test Speakers' window, the correct sound systematically starts as soon as I hit any 'Test' button (under 'Front Left' or 'Front Right').

-  But if I choose the 'HDMI / DisplayPort - Tahiti XT HDMI Audio [Radeon HD 7970 Series]' device, the sound output starts several seconds LATE :
   For example, inside the 'Test Speakers' window, the sound starts at the end of the 2nd time I hit any 'Test' button (under 'Front Left' or 'Front Right').  Then continuous sound is correct and in sync.
   But after approx. 10s of silence (no sound to output), new sound output starts several seconds LATE again.


$ sudo  lspci  -nn  -vv  -s 1:00

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] [1002:6798] (prog-if 00 [VGA controller])
	Subsystem: PC Partner Limited / Sapphire Technology Device [174b:3001]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 49
	Region 0: Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Region 2: Memory at fea00000 (64-bit, non-prefetchable) [size=256K]
	Region 4: I/O ports at e000 [size=256]
	Expansion ROM at fea40000 [disabled] [size=128K]
	Capabilities: [48] Vendor Specific Information: Len=08 <?>
	Capabilities: [50] Power Management version 3
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
		LnkCap:	Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
		LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
			 Compliance De-emphasis: -6dB
		LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee00000  Data: 0000
	Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
	Capabilities: [150 v2] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
	Capabilities: [200 v1] #15
	Capabilities: [270 v1] #19
	Capabilities: [2b0 v1] Address Translation Service (ATS)
		ATSCap:	Invalidate Queue Depth: 00
		ATSCtl:	Enable+, Smallest Translation Unit: 00
	Capabilities: [2c0 v1] #13
	Capabilities: [2d0 v1] #1b
	Kernel driver in use: radeon

01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
	Subsystem: PC Partner Limited / Sapphire Technology Device [174b:aaa0]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin B routed to IRQ 51
	Region 0: Memory at fea60000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: [48] Vendor Specific Information: Len=08 <?>
	Capabilities: [50] Power Management version 3
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
		LnkCap:	Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
		LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee00000  Data: 0000
	Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
	Capabilities: [150 v2] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
	Kernel driver in use: snd_hda_intel

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-14-generic 4.2.0-14.16
ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
Uname: Linux 4.2.0-14-generic x86_64
ApportVersion: 2.19-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0c:   z_admin    1665 F...m pulseaudio
 /dev/snd/controlC0:  z_admin    1665 F.... pulseaudio
 /dev/snd/controlC1:  z_admin    1665 F.... pulseaudio
CurrentDesktop: GNOME
Date: Thu Oct  8 17:46:05 2015
HibernationDevice: RESUME=UUID=ccecc437-66d2-4e39-ac56-76ab11e18140
InstallationDate: Installed on 2015-09-27 (10 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
IwConfig:
 enp2s0    no wireless extensions.
 
 lo        no wireless extensions.
MachineType: To be filled by O.E.M. To be filled by O.E.M.
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-14-generic root=UUID=a5c156d8-eac3-47fa-835c-b2c4ebda969d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-14-generic N/A
 linux-backports-modules-4.2.0-14-generic  N/A
 linux-firmware                            1.149
RfKill:
 
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/07/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2501
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: M5A97 R2.0
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2501:bd04/07/2014:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97R2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug wily

-- 
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https://bugs.launchpad.net/bugs/1504227

Title:
  Sound output starts several seconds late using DisplayPort with
  [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I am using simultaneously :
  -  an audio headset connected to the analog audio output,
  -  a DisplayPort cable to connect my display to my 'AMD Tahiti XT [Radeon HD 7970 ...]' graphics + sound card.

  Using the 'Sound' panel of 'gnome-control-center', I systematically
  get following behaviour for sound output :

  -  If I choose the 'Line Out - Built-in Audio' device, the sound output comes immediately :
     For example, inside the 'Test Speakers' window, the correct sound systematically starts as soon as I hit any 'Test' button (under 'Front Left' or 'Front Right').

  -  But if I choose the 'HDMI / DisplayPort - Tahiti XT HDMI Audio [Radeon HD 7970 Series]' device, the sound output starts several seconds LATE :
     For example, inside the 'Test Speakers' window, the sound starts at the end of the 2nd time I hit any 'Test' button (under 'Front Left' or 'Front Right').  Then continuous sound is correct and in sync.
     But after approx. 10s of silence (no sound to output), new sound output starts several seconds LATE again.

  
  $ sudo  lspci  -nn  -vv  -s 1:00

  01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] [1002:6798] (prog-if 00 [VGA controller])
  	Subsystem: PC Partner Limited / Sapphire Technology Device [174b:3001]
  	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
  	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
  	Latency: 0, Cache Line Size: 64 bytes
  	Interrupt: pin A routed to IRQ 49
  	Region 0: Memory at c0000000 (64-bit, prefetchable) [size=256M]
  	Region 2: Memory at fea00000 (64-bit, non-prefetchable) [size=256K]
  	Region 4: I/O ports at e000 [size=256]
  	Expansion ROM at fea40000 [disabled] [size=128K]
  	Capabilities: [48] Vendor Specific Information: Len=08 <?>
  	Capabilities: [50] Power Management version 3
  		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
  		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
  	Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00
  		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
  			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
  		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
  			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
  			MaxPayload 128 bytes, MaxReadReq 512 bytes
  		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
  		LnkCap:	Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
  			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
  		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk+
  			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  		LnkSta:	Speed 5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  		DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
  		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
  		LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
  			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
  			 Compliance De-emphasis: -6dB
  		LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
  			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
  	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
  		Address: 00000000fee00000  Data: 0000
  	Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
  	Capabilities: [150 v2] Advanced Error Reporting
  		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
  		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
  		UESvrt:	DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
  		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
  		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
  		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
  	Capabilities: [200 v1] #15
  	Capabilities: [270 v1] #19
  	Capabilities: [2b0 v1] Address Translation Service (ATS)
  		ATSCap:	Invalidate Queue Depth: 00
  		ATSCtl:	Enable+, Smallest Translation Unit: 00
  	Capabilities: [2c0 v1] #13
  	Capabilities: [2d0 v1] #1b
  	Kernel driver in use: radeon

  01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
  	Subsystem: PC Partner Limited / Sapphire Technology Device [174b:aaa0]
  	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
  	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
  	Latency: 0, Cache Line Size: 64 bytes
  	Interrupt: pin B routed to IRQ 51
  	Region 0: Memory at fea60000 (64-bit, non-prefetchable) [size=16K]
  	Capabilities: [48] Vendor Specific Information: Len=08 <?>
  	Capabilities: [50] Power Management version 3
  		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
  	Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00
  		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
  			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
  		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
  			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
  			MaxPayload 128 bytes, MaxReadReq 512 bytes
  		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
  		LnkCap:	Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
  			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
  		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk+
  			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  		LnkSta:	Speed 5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  		DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
  		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
  		LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
  			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
  	Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
  		Address: 00000000fee00000  Data: 0000
  	Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
  	Capabilities: [150 v2] Advanced Error Reporting
  		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
  		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
  		UESvrt:	DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
  		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
  		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
  		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
  	Kernel driver in use: snd_hda_intel

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-14-generic 4.2.0-14.16
  ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
  Uname: Linux 4.2.0-14-generic x86_64
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   z_admin    1665 F...m pulseaudio
   /dev/snd/controlC0:  z_admin    1665 F.... pulseaudio
   /dev/snd/controlC1:  z_admin    1665 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Thu Oct  8 17:46:05 2015
  HibernationDevice: RESUME=UUID=ccecc437-66d2-4e39-ac56-76ab11e18140
  InstallationDate: Installed on 2015-09-27 (10 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  IwConfig:
   enp2s0    no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-14-generic root=UUID=a5c156d8-eac3-47fa-835c-b2c4ebda969d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-14-generic N/A
   linux-backports-modules-4.2.0-14-generic  N/A
   linux-firmware                            1.149
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2501
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A97 R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2501:bd04/07/2014:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97R2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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Follow ups

[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Etienne URBAH, 2016-03-17
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Etienne URBAH, 2015-11-10
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Christopher M. Penalver, 2015-10-23
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Etienne URBAH, 2015-10-22
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Christopher M. Penalver, 2015-10-16
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Etienne URBAH, 2015-10-15
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Christopher M. Penalver, 2015-10-13
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Etienne URBAH, 2015-10-08
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Etienne URBAH, 2015-10-08
[Bug 1504227] Re: Sound output starts several seconds late using DisplayPort with [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] [1002:aaa0]
From: Joseph Salisbury, 2015-10-08
[Bug 1504227] Status changed to Confirmed
From: Brad Figg, 2015-10-08