[Bug 94231] New: kernel 3.14.? - screen LVDS1 turns black early at boot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94231

            Bug ID: 94231
           Summary: kernel 3.14.? - screen LVDS1 turns black early at boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14
          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: charles17 at arcor.de
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 168861
  --> https://bugzilla.kernel.org/attachment.cgi?id=168861&action=edit
lspci -vvv -s 00_02.0

Screen LVDS1 turns black early at boot with kernel 3.14

The computer is a laptop and  has been used with an external screen plugged
(VGA) for several months.

After unplugging the VGA from the laptop I was getting a black screen at boot.
Grub2 screen is ok but in the very early stage at boot just after showing the
first few kernel lines the built-in screen turns black.  

CTRL-ALT-F1 + CTRL-ALT--F7 does not help.  Built-in screen stays black until a
VGA is plugged.  

With the VGA plugged (even when it's power is off) the boot is normal with all
the boot messages visible on the built-in screen. This behaviour is
reproducible:

  VGA plugged: Screen is ok
  VGA unplugged: Screen tuns black at boot

The problem seems to be fixed later in kernel v3.15

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