[Bug 71151] New: i915: connecting VGA1 disables LVDS1 and vice versa

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71151

            Bug ID: 71151
           Summary: i915: connecting VGA1 disables LVDS1 and vice versa
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13.4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hmr at igh-essen.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 127421
  --> https://bugzilla.kernel.org/attachment.cgi?id=127421&action=edit
output of drm.debug=0xe in messages

This IPC has a build in touch screen which is connected to LVDS1. After
connecting a second display on port VGA1, LVDS1 is reported (from xrandr) as
disconnected. After disconnecting VGA1, LVDS1 is reported as connected again.

Booting with nomodeset (framebuffer): both screens are enabled and running as
expected!

IPC-Type: iEi PPC-5170A
chipset: Intel H61
lspci: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller]), Subsystem: Intel Corporation Device 2111

As drm.debug output also reports a unconnected LVDS1, I assume it is a issue
with the i915 driver maybe in combination with a buggy hardware. The debugging
output is attached.

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