[Bug 97345] New: Intel video driver cannot display laptop screen anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97345

            Bug ID: 97345
           Summary: Intel video driver cannot display laptop screen
                    anymore
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: freedesktop at nicohood.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hello,
I was redirected here from the archlinux IRC chat, hoping that this is the
correct place to file this bug.

I recently updated my archlinux kernel from 4.6 to 4.7 and my laptop screen is
fully dead now (backlight still on). I am using an intel cpu/gpu 4000 with the
builtin kernel drivers (no additional intel driver of arch).

This monitor is displayed in the xfce monitor config though. If i switch to
tty1 there is no output at all on the laptop. My 2 external displays work. If I
turn one off, this doesnt affect the laptop screen.

When booting I need to unlock my root partition (encrypted). This message is
actually displayed on the laptop screen at the initial step when systemd was
loaded. I am using EFI, but I can also boot MBR.

Switching back to 4.4 LTS kernel solves this problem.

My hardware is the following:
model name      : Intel(R) Core(TM) i7-4702MQ CPU @ 2.20GHz

Its an Fujitsu Lifebook E744.

dmesg:
https://gist.github.com/NicoHood/3e515f96b522fc1ae0d6a781ce00ff58

Let me know of any additional information that I should provide.
I did not open a bug anywhere else yet, as people directed me here first. In
the meantime I will try the mainline kernel and report results back.

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