[Bug 71871] New: Dell Latitude E7440 docking station merges DVI and DP dual display into DP2

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71871

            Bug ID: 71871
           Summary: Dell Latitude E7440 docking station merges DVI and DP
                    dual display into DP2
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.12.9
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mikopp at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Older intel hardware would show the DVI and DP port on the dockingstation as
HDMI1 and DP1 whereas the internal display is eDP1. The Haswell in my E7440
merges the two pysical displays on 2 pysical ports into a single large display
on DP2, breaking dual screen support (X and xrandr is not aware of screen
edges...)

Also see http://forums.linuxmint.com/viewtopic.php?f=59&t=160637


xrandr:

Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 32767 x 32767
eDP1 connected 1920x1080+1920+120 (normal left inverted right x axis y axis)
309mm x 174mm
   1920x1080      60.0*+
   1400x1050      60.0  
   1280x1024      60.0  
   1280x960       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 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis)
519mm x 320mm
   1920x1200      60.0*+
   1600x1200      60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
HDMI2 disconnected (normal left inverted right x axis y axis)

lspci:
00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
        Subsystem: Dell Device 05cb
        Flags: bus master, fast devsel, latency 0
        Capabilities: [e0] Vendor Specific Information: Len=0c <?>

00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 0b) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 05cb
        Flags: bus master, fast devsel, latency 0, IRQ 57
        Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915
        Kernel modules: i915

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