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[Brian Ben Maranville <1237479@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I am able to boot "try without installing" from the daily image for Saucy, but the internal display never shows anything but a blank screen.
My computer is an Acer S7 laptop with intel HD4000 graphics.

I am booting in EFI mode, and the computer successfully boots because I
can hear the Ubuntu volume change sounds when I hit the volume up/down
buttons, and when I then attach an external HDMI monitor I can see a
desktop.  The backlight on the internal display is on (I can see it
glowing) but the internal screen is completely blank.  Using the hotkey
I can turn the backlight on/off.  "Settings/Displays" shows "Built-in
Display" as active and positioned next to external HDMI monitor.

If I boot in legacy mode, the internal display works.  I have previously
installed Ubuntu 13.04 on the same laptop in EFI mode without issues.

Strangely the internal display is not detected as LVDS, as xrandr gives
this output:

ubuntu@ubuntu:~$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 256mm x 144mm
   1920x1080      60.0*+   59.9  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   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+1920+0 (normal left inverted right x axis y axis) 521mm x 293mm
   1920x1080      60.0*+   50.0     59.9  
   1920x1080i     60.1     50.0     60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1440x900       59.9  
   1280x960       60.0  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1440x576       50.0  
   1024x768       75.1     70.1     60.0  
   1440x480       60.0     59.9  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        75.0     72.8     66.7     60.0     59.9  
   720x400        70.1  
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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

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https://bugs.launchpad.net/bugs/1237479

Title:
  No internal display in Saucy

Status in “linux” package in Ubuntu:
  New

Bug description:
  I am able to boot "try without installing" from the daily image for Saucy, but the internal display never shows anything but a blank screen.
  My computer is an Acer S7 laptop with intel HD4000 graphics.

  I am booting in EFI mode, and the computer successfully boots because
  I can hear the Ubuntu volume change sounds when I hit the volume
  up/down buttons, and when I then attach an external HDMI monitor I can
  see a desktop.  The backlight on the internal display is on (I can see
  it glowing) but the internal screen is completely blank.  Using the
  hotkey I can turn the backlight on/off.  "Settings/Displays" shows
  "Built-in Display" as active and positioned next to external HDMI
  monitor.

  If I boot in legacy mode, the internal display works.  I have
  previously installed Ubuntu 13.04 on the same laptop in EFI mode
  without issues.

  Strangely the internal display is not detected as LVDS, as xrandr
  gives this output:

  ubuntu@ubuntu:~$ xrandr
  Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 32767 x 32767
  eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 256mm x 144mm
     1920x1080      60.0*+   59.9  
     1680x1050      60.0     59.9  
     1600x1024      60.2  
     1400x1050      60.0  
     1280x1024      60.0  
     1440x900       59.9  
     1280x960       60.0  
     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+1920+0 (normal left inverted right x axis y axis) 521mm x 293mm
     1920x1080      60.0*+   50.0     59.9  
     1920x1080i     60.1     50.0     60.0  
     1680x1050      59.9  
     1280x1024      75.0     60.0  
     1440x900       59.9  
     1280x960       60.0  
     1152x864       75.0  
     1280x720       60.0     50.0     59.9  
     1440x576       50.0  
     1024x768       75.1     70.1     60.0  
     1440x480       60.0     59.9  
     832x624        74.6  
     800x600        72.2     75.0     60.3     56.2  
     720x576        50.0  
     720x480        60.0     59.9  
     640x480        75.0     72.8     66.7     60.0     59.9  
     720x400        70.1  
  DP1 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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