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$ xrandr --prop
Screen 0: minimum 320 x 200, current 2560 x 1600, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
DVI-0 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 641mm x 400mm
	EDID:
		00ffffffffffff0010ac35404c544c33
		1c12010380412978ea8f95ad4f32b225
		0f5054a54b008180a940d100d140714f
		8100b3000101b06800a0a0402e603020
		360081902100001e000000ff00473530
		3148383741334c544c0a283c80a070b0
		23403020360081912100001c000000fd
		0031561d711c000a20202020202000dd
	load detection: 1 (0x00000001)	range:  (0,1)
	underscan vborder: 0 (0x00000000)	range:  (0,128)
	underscan hborder: 0 (0x00000000)	range:  (0,128)
	underscan:	off
		supported: off          on           auto        
	coherent: 1 (0x00000001)	range:  (0,1)
   2560x1600      59.9*+
   1920x1440      60.0  
   1920x1200      60.0  
   1600x1200      60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1280x800       59.9  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
DIN disconnected (normal left inverted right x axis y axis)
	tv standard:	pal
		supported: ntsc         pal          pal-m        pal-60      
		           ntsc-j       scart-pal    pal-cn       secam       
	load detection: 1 (0x00000001)	range:  (0,1)

Hmm, it thinks it is disconnected. I wonder how the display showed the
boot sequence & grub screens if it is disconnected.

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https://bugs.launchpad.net/bugs/1035556

Title:
  1002:9442 Monitor not detected via DisplayPort [Radeon HD 4850]

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I have a PowerColor AX4850 512MD3-DHO video card,  a BenQ XL2420TX monitor, and a Dell 3008WFP monitor.
  I tried to connect the BenQ monitor with the DisplayPort connection.
  This video driver did not recognize that there was anything plugged in.
  Even if the BenQ was the only monitor connected, the OS driver found nothing.

  WORKAROUND: The ATI binary BLOB did properly recognize this monitor
  plugged in to the DisplayPort, but that driver is unusable for other
  reasons.

  I currently have this monitor connected via HDMI, but this connection
  precludes the use of 120 hz refresh and 3D video.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xserver-xorg-video-radeon 1:6.14.99~git20111219.aacbd629-0ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,snap,expo,move,resize,scale,regex]
  CompositorRunning: None
  Date: Fri Aug 10 21:37:57 2012
  DistUpgraded: 2012-04-28 14:29:07,399 DEBUG enabling apt cron job
  DistroCodename: precise
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices [AMD] nee ATI RV770 [Radeon HD 4850] [1002:9442] (prog-if 00 [VGA controller])
     Subsystem: Hightech Information System Ltd. Device [1787:2266]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: System manufacturer System Product Name
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic root=UUID=c2921384-38b9-419e-b7ef-007bcc801561 ro nosplash debug --verbose
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: Upgraded to precise on 2012-04-28 (104 days ago)
  dmi.bios.date: 09/21/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2209
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T DELUXE
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2209:bd09/21/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TDELUXE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.7.8-0ubuntu1.2
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2
  ---
  ApportVersion: 2.12-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.336
  DistroRelease: Ubuntu 13.10
  IwConfig:
   eth0      no wireless extensions.

   eth1      no wireless extensions.

   lo        no wireless extensions.
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130817)
  MachineType: System manufacturer System Product Name
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.11.0-2.5-generic 3.11.0-rc5
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-2-generic N/A
   linux-backports-modules-3.11.0-2-generic  N/A
   linux-firmware                            1.113
  RfKill:

  Tags:  saucy
  Uname: Linux 3.11.0-2-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 09/21/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2209
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T DELUXE
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2209:bd09/21/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TDELUXE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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