[Bug 92129] New: [BSW] No output on internal laptop display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92129

            Bug ID: 92129
           Summary: [BSW] No output on internal laptop display
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gentoo at gishpuppy.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118457
  --> https://bugs.freedesktop.org/attachment.cgi?id=118457&action=edit
dmesg with drm.debug=0x1e

System architecture: x86_64
Kernel version: 4.1.6-alt460-amd64
Linux distribution: SystemRescueCd 4.6.0 (based on Gentoo Linux)
Machine: Acer TravelMate B116-M-P16S
Processor: Intel Pentium N3700
Display: Internal LCD (connected using eDP-1 according to /sys/class/drm/)

When the KMS driver loads I no longer see any output on the laptop screen
(backlight remains on). Output via HDMI works.
The kernel log shows a warning about a timeout including back trace (see
attached dmesg output with debug info).

The internal display only works if I add i915.modeset=0 to the boot options or
if I boot an older kernel that doesn't use KMS.
The problem is reproducible with other kernel versions/distributions (e.g.
Lubuntu 15.04 (Kernel 3.19.0)).

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