Posts in other forums that seem related:
http://askubuntu.com/questions/216075/no-hdmi-output-on-12-10-intel-hd-graphics-ironlake/249593
http://ubuntuforums.org/showthread.php?p=12456931
http://askubuntu.com/questions/213371/screen-will-not-display-on-hdmi-or-vga-connected-projector

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https://bugs.launchpad.net/bugs/1112859

Title:
  Optoma HD20 projector recognized but no HDMI signal

Status in “xorg” package in Ubuntu:
  New

Bug description:
  Synopsis: I get "No Signal" and an otherwise blank screen when
  connecting my Dell XPS 14" Ultrabook running 12.10 to Optoma HD20
  projectors (we have two). The projector is recognized as connected.
  This laptop correctly displays on at least 5 other models of external
  monitors and projectors over HDMI without issue. Several Macs are
  known to work fine with these projectors.

  
  Hardware Details:
  The laptop is a Dell XPS Ultrabook (L421X) running 12.10. This laptop has 
Intel 4000 and NVIDIA 630M graphics, and lsmod shows nouveau and i915 drivers 
loaded. This model has both HDMI and mini DisplayPort; results are identical 
for HDMI and the mini DP port (with miniDP-HDMI adapter).

  The projector is the Optoma HD20. This projector has two HDMI inputs
  and native 1920x1600 projection. We have two of them, and all
  behaviors described here are identical for both of them.

  snafu$ lsb_release -rd
  Description:  Ubuntu 12.10
  Release:      12.10

  snafu$ apt-cache policy xorg
  xorg:
    Installed: 1:7.7+1ubuntu4
    Candidate: 1:7.7+1ubuntu4
    Version table:
   *** 1:7.7+1ubuntu4 0
          500 http://us.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
          100 /var/lib/dpkg/status


  What I've tried:

  When I plug the projector into my laptop, the projector is recognized
  quickly as OTM 72" in Settings > Displays, but the projector declares
  "No Signal" and has blank display. (Is OTM 72" right?) Xorg.0.log
  shows frame buffer allocations that seem sensible based on laptop and
  selected projector resolutions. Clicking "Apply" leads to the 30s
  timeout dialog in which the laptop display is fine (i.e., not garbled)
  but the projector says "no signal".

  Both projectors work fine with Macs.

  I have tried multiple cable and cable lengths.

  I have tried multiple resolutions, with and without mirroring.

  http://harts.net/reece/tmp/optoma-hd20.edid-decode contains the edid
  info generated by edid-decode
  /sys/devices/pci0000\:00/0000\:00\:02.0/drm/card0/card0-HDMI-A-1/edid
  .

  12.04.1 LTS behaves similarly.

  Rebooting with the projector connected has the same effect.

  I've tried the xrandr and gtf suggestions at
  http://askubuntu.com/questions/216075/no-hdmi-output-on-12-10-intel-
  hd-graphics-ironlake/249593#249593 without success.

  
  Not sure if this is helpful:
  snafu$ xrandr -q
  Screen 0: minimum 320 x 200, current 3520 x 1080, maximum 8192 x 8192
  LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 309mm 
x 174mm
     1600x900       60.0*+   40.0  
     1440x900       59.9  
     1360x768       59.8     60.0  
     1152x864       60.0  
     1024x768       60.0  
     800x600        60.3     56.2  
     640x480        59.9  
  VGA1 disconnected (normal left inverted right x axis y axis)
  HDMI1 connected 1920x1080+1600+0 (normal left inverted right x axis y axis) 
708mm x 398mm
     1920x1080      60.0*+   50.0     30.0     25.0     24.0     30.0     25.0  
     1600x1200      60.0  
     1680x1050      59.9  
     1680x945       60.0  
  (clipped)

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.5.0-22.34-generic 3.5.7.2
  Uname: Linux 3.5.0-22-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,imgpng,mousepoll,snap,resize,move,grid,unitymtgrabhandles,place,regex,gnomecompat,vpswitch,animation,expo,workarounds,ezoom,wall,session,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Fri Feb  1 12:10:49 2013
  DistUpgraded: 2012-10-25 06:04:30,095 DEBUG enabling apt cron job
  DistroCodename: quantal
  DistroVariant: ubuntu
  DkmsStatus:
   vboxhost, 4.2.6, 3.5.0-21-generic, x86_64: installed
   vboxhost, 4.2.6, 3.5.0-22-generic, x86_64: installed
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:054d]
     Subsystem: Dell Device [1028:054d]
  InstallationDate: Installed on 2012-10-09 (114 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120823.1)
  MachineType: Dell Inc. XPS L421X
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-22-generic 
root=UUID=b19be1d6-88a8-4b04-862d-65a6cce9e6ee ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to quantal on 2012-10-25 (99 days ago)
  dmi.bios.date: 06/26/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 08HDPJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A04
  dmi.modalias: 
dmi:bvnDellInc.:bvrA04:bd06/26/2012:svnDellInc.:pnXPSL421X:pvrA04:rvnDellInc.:rn08HDPJ:rvrA00:cvnDellInc.:ct8:cvrA04:
  dmi.product.name: XPS L421X
  dmi.product.version: A04
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.8.6-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.39-0ubuntu1.0~ppa1.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.99.99~git20120913.8637f772-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.2-0ubuntu3

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