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[Bug 696670] Re: HDMI sound output only works if laptop monitor is on

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** Description changed:

  Binary package hint: xorg
  
  I'm using Ubuntu 10.10, fully updated from the regular repositories.
  
- I connect my laptop to an HDTV through HDMI, configuring it through
- Preferences -> Monitors. I switch sound output to HDMI in System ->
- Preference -> Sound -> Output. This works flawlessly as long as I
- somehow use my laptop monitor, meaning that I either mirror the screens
- or use an extended desktop. If turn off the laptop monitor there is no
- sound output; turning back on the laptop monitor restores sound output
- to the TV.
- 
+ I connect my laptop to an HDTV through HDMI, configuring it through Preferences -> Monitors. I switch sound output to HDMI in System -> Preference -> Sound -> Output. This works flawlessly as long as I somehow use my laptop monitor, meaning that I either mirror the screens or use an extended desktop. If I turn off the laptop monitor there is no sound output through the HDMI; turning back on the laptop monitor restores sound output to the TV. Switching back to the regular output device works as expected.
+  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xorg 1:7.5+6ubuntu3
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Uname: Linux 2.6.35-24-generic x86_64
  Architecture: amd64
  DRM.card0.HDMI_Type_A.1:
-  status: disconnected
-  enabled: enabled
-  dpms: Off
-  modes: 
-  edid-base64:
+  status: disconnected
+  enabled: enabled
+  dpms: Off
+  modes:
+  edid-base64:
  DRM.card0.LVDS.1:
-  status: connected
-  enabled: enabled
-  dpms: On
-  modes: 1920x1080 1680x1050 1400x1050 1280x1024 1440x900 1280x960 1280x854 1280x800 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
-  edid-base64: AP///////wAGr+0RAAAAAAETAQOAIhN4CsiVnldUkiYPUFQAAAABAQEBAQEBAQEBAQEBAQEBTDaAXnA4RkAeFKoAWMEQAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTU2SFcwMSBWMSAKAE8=
+  status: connected
+  enabled: enabled
+  dpms: On
+  modes: 1920x1080 1680x1050 1400x1050 1280x1024 1440x900 1280x960 1280x854 1280x800 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
+  edid-base64: AP///////wAGr+0RAAAAAAETAQOAIhN4CsiVnldUkiYPUFQAAAABAQEBAQEBAQEBAQEBAQEBTDaAXnA4RkAeFKoAWMEQAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTU2SFcwMSBWMSAKAE8=
  DRM.card0.VGA.1:
-  status: disconnected
-  enabled: disabled
-  dpms: Off
-  modes: 
-  edid-base64:
+  status: disconnected
+  enabled: disabled
+  dpms: Off
+  modes:
+  edid-base64:
  Date: Mon Jan  3 02:40:35 2011
  DkmsStatus:
-  synaptics, 1.1.0, 2.6.35-24-generic, x86_64: installed 
-  synaptics, 1.1.0, 2.6.35-23-generic, x86_64: installed
+  synaptics, 1.1.0, 2.6.35-24-generic, x86_64: installed
+  synaptics, 1.1.0, 2.6.35-23-generic, x86_64: installed
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  Lsusb:
-  Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
-  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 001 Device 005: ID 045e:0039 Microsoft Corp. IntelliMouse Optical
-  Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
+  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 001 Device 005: ID 045e:0039 Microsoft Corp. IntelliMouse Optical
+  Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: CLEVO W760/M770CU
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=0558c756-7152-43a4-963c-a15c39fa1697 ro quiet splash
  ProcEnviron:
-  PATH=(custom, user)
-  LANG=en_US.utf8
-  SHELL=/bin/bash
+  PATH=(custom, user)
+  LANG=en_US.utf8
+  SHELL=/bin/bash
  SourcePackage: xorg
  dmi.bios.date: 10/26/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: CALPELLACRB.86C.0000.X.0000000000
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W760/M770CU
  dmi.board.vendor: CLEVO
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: CLEVO
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrCALPELLACRB.86C.0000.X.0000000000:bd10/26/2009:svnCLEVO:pnW760/M770CU:pvrNotApplicable:rvnCLEVO:rnW760/M770CU:rvrNotApplicable:cvnCLEVO:ct9:cvrN/A:
  dmi.product.name: W760/M770CU
  dmi.product.version: Not Applicable
  dmi.sys.vendor: CLEVO
  glxinfo: Error: [Errno 2] No such file or directory
  system:
-  distro:             Ubuntu
-  codename:           maverick
-  architecture:       x86_64
-  kernel:             2.6.35-24-generic
+  distro:             Ubuntu
+  codename:           maverick
+  architecture:       x86_64
+  kernel:             2.6.35-24-generic

** Description changed:

  Binary package hint: xorg
  
  I'm using Ubuntu 10.10, fully updated from the regular repositories.
  
- I connect my laptop to an HDTV through HDMI, configuring it through Preferences -> Monitors. I switch sound output to HDMI in System -> Preference -> Sound -> Output. This works flawlessly as long as I somehow use my laptop monitor, meaning that I either mirror the screens or use an extended desktop. If I turn off the laptop monitor there is no sound output through the HDMI; turning back on the laptop monitor restores sound output to the TV. Switching back to the regular output device works as expected.
-  
+ I connect my laptop to an HDTV through HDMI, configuring it through
+ Preferences -> Monitors. I switch sound output to HDMI in System ->
+ Preferences -> Sound -> Output. This works flawlessly as long as I
+ somehow use my laptop monitor, meaning that I either mirror the screens
+ or use an extended desktop. If I turn off the laptop monitor there is no
+ sound output through the HDMI; turning back on the laptop monitor
+ restores sound output to the TV. Switching back to the regular output
+ device works as expected.
+ 
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xorg 1:7.5+6ubuntu3
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Uname: Linux 2.6.35-24-generic x86_64
  Architecture: amd64
  DRM.card0.HDMI_Type_A.1:
   status: disconnected
   enabled: enabled
   dpms: Off
   modes:
   edid-base64:
  DRM.card0.LVDS.1:
   status: connected
   enabled: enabled
   dpms: On
   modes: 1920x1080 1680x1050 1400x1050 1280x1024 1440x900 1280x960 1280x854 1280x800 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
   edid-base64: AP///////wAGr+0RAAAAAAETAQOAIhN4CsiVnldUkiYPUFQAAAABAQEBAQEBAQEBAQEBAQEBTDaAXnA4RkAeFKoAWMEQAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTU2SFcwMSBWMSAKAE8=
  DRM.card0.VGA.1:
   status: disconnected
   enabled: disabled
   dpms: Off
   modes:
   edid-base64:
  Date: Mon Jan  3 02:40:35 2011
  DkmsStatus:
   synaptics, 1.1.0, 2.6.35-24-generic, x86_64: installed
   synaptics, 1.1.0, 2.6.35-23-generic, x86_64: installed
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  Lsusb:
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 005: ID 045e:0039 Microsoft Corp. IntelliMouse Optical
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: CLEVO W760/M770CU
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=0558c756-7152-43a4-963c-a15c39fa1697 ro quiet splash
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: xorg
  dmi.bios.date: 10/26/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: CALPELLACRB.86C.0000.X.0000000000
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W760/M770CU
  dmi.board.vendor: CLEVO
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: CLEVO
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrCALPELLACRB.86C.0000.X.0000000000:bd10/26/2009:svnCLEVO:pnW760/M770CU:pvrNotApplicable:rvnCLEVO:rnW760/M770CU:rvrNotApplicable:cvnCLEVO:ct9:cvrN/A:
  dmi.product.name: W760/M770CU
  dmi.product.version: Not Applicable
  dmi.sys.vendor: CLEVO
  glxinfo: Error: [Errno 2] No such file or directory
  system:
   distro:             Ubuntu
   codename:           maverick
   architecture:       x86_64
   kernel:             2.6.35-24-generic

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https://bugs.launchpad.net/bugs/696670

Title:
  HDMI sound output only works if laptop monitor is on

References

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