[Bug 75385] New: Dell Latitude E5440 screen goes blank when external VGA monitor connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75385

          Priority: medium
            Bug ID: 75385
          Assignee: chris at chris-wilson.co.uk
           Summary: Dell Latitude E5440 screen goes blank when external
                    VGA monitor connected
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: colin.morningstar at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Laptop screen goes completely blank when external VGA connected (even turned
off), and external monitor is blank.  Very frustrating.  Will have to boot into
Windows 8.1 to give presentations!!  Works with the HDMI output (not best
looking though).  Display comes back as soon as VGA disconnected.

Tried a bunch of different kernel options, playing with xorg.conf, and even a
firmware update.   Seems like a bug to me(?), but I am newbie with video
drivers.

Mageia 4 Linux version 3.12.9-desktop-1.mga4 (iurt at jonund.mageia.org) (gcc
version 4.8.2 
(GCC) ) #1 SMP Sat Feb 1 18:16:06 UTC 2014

gnome 3 desktop

libdrm_intel1-2.4.51-1.mga4
x11-driver-video-intel-2.99.907-2.mga4
lib64drm_intel1-2.4.51-1.mga4

Dell Latitude E5440 laptop   Intel HD 4400  (Haswell ULT)

xrandr -q  (no external monitor connected....monitor connects to DP1)

Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis)
309mm x 174mm
   1366x768       60.0*+
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


  tail /var/log/Xorg.0.log  (following added during connect/disconnect)

[    56.606] (II) intel(0): resizing framebuffer to 3286x1080
[    56.606] (II) intel(0): switch to mode 1366x768 at 60.0 on eDP1 using pipe 0,
position (0, 0), rotation normal, reflection none
[    56.630] (II) intel(0): switch to mode 1920x1080 at 60.0 on DP1 using pipe 0,
position (1366, 0), rotation normal, reflection none
[    61.557] (II) intel(0): switch to mode 1366x768 at 60.0 on eDP1 using pipe 1,
position (0, 0), rotation normal, reflection none
[    62.060] (II) intel(0): resizing framebuffer to 1366x768
[    62.060] (II) intel(0): switch to mode 1366x768 at 60.0 on eDP1 using pipe 1,
position (0, 0), rotation normal, reflection none

[

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