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[Braud <1416927@xxxxxxxxxxxxxxxxxx>]

Ok, I solved the problem : apparently the brightness of the second
display was incorrectly set...

I used 
sleep 1 && xset dpms force off

As indicated here : 
https://wiki.archlinux.org/index.php/backlight

And my display restarted...

Thanks anyway.
Braud

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https://bugs.launchpad.net/bugs/1416927

Title:
  Built-in display no longer working [GTX765M] [Alienware 15]

Status in nvidia-graphics-drivers-331 package in Ubuntu:
  New

Bug description:
  Hello everyone,

  Since this friday I have an annoying bug on my Alienware m15 (GTX765M) connected to an external display running Ubuntu 14.04.01LTS (kernel3.13.0-45-generic) :
  - Upon boot, the grub splash screen and the ubuntu splash screen are correctly displayed on the built-in display.
  - When reaching login, the built-in display turns black and no way to wake it up.
  - Tested on unity, xmonad, nvidia-331.38 (That I kept for other bugs) and nvidia-346 (from xorg-edgers).
  - If I switch back to tty (ctrl-alt-f1) it works perfectly on the built-in display.

  The weird thing is that scrot takes a picture of the full display :
  http://i.imgur.com/43Dj5Aw.jpg
  While it looks like this from my desk :
  http://imgur.com/0i3Cm3Y

  I tried many times to force it through xrandr :
  xrandr --output eDP1 --auto --output DP-0 --auto --right-of eDP1
  I also looked into xorg.conf, nothing special there.

  In nvidia-settings, I only see the external screen but xscreen0 is
  correctly detected as being 3840x1200...

  I checked in dmesg, I didn't see anything fishy (attached for good measure). However, I recently crashed my desktop by trying to display stuff on the built in display and I have this error :
  [ 2073.710370] gpu-manager[5299]: segfault at c0 ip 00007f0545367d1d sp 00007fff2610da10 error 4 in libc-2.19.so[7f054531e000+1bb000]

  Any ideas ?

  lspci | grep VGA
  00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
  01:00.0 VGA compatible controller: NVIDIA Corporation GK106M [GeForce GTX 765M] (rev a1)
  xrandr -q
  Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 16384 x 16384
  DP-0 connected primary 1920x1200+1920+0 (normal left inverted right x axis y axis) 519mm x 324mm
     1920x1200      60.0*+
     1680x1050      60.0
     1600x1200      60.0
     1280x1024      60.0
     1280x960       60.0
     1024x768       60.0
     800x600        60.3
     640x480        59.9
  HDMI-0 disconnected (normal left inverted right x axis y axis)
  HDMI-1 disconnected (normal left inverted right x axis y axis)
  DP-1 disconnected (normal left inverted right x axis y axis)
  DP-2 disconnected (normal left inverted right x axis y axis)
  eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
     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
  HDMI1 disconnected (normal left inverted right x axis y axis)
  VGA1 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)
    1680x1050 (0x2c9)  146.2MHz
          h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
          v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
    1280x1024 (0x2cb)  108.0MHz
          h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
          v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
    1280x960 (0x2cc)  108.0MHz
          h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
          v: height  960 start  961 end  964 total 1000           clock   60.0Hz
    1024x768 (0x2cd)   65.0MHz
          h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
          v: height  768 start  771 end  777 total  806           clock   60.0Hz
    800x600 (0x2ce)   40.0MHz
          h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
          v: height  600 start  601 end  605 total  628           clock   60.3Hz
    640x480 (0x2cf)   25.2MHz
          h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
          v: height  480 start  490 end  492 total  525           clock   59.9Hz

  Thanks,
  Braud

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