[Bug 97031] New: Pentium N3700, after boot DisplayPort signal blank/black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97031

            Bug ID: 97031
           Summary: Pentium N3700, after boot DisplayPort signal
                    blank/black
           Product: DRI
           Version: DRI git
          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: mattias.slabanja at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125244
  --> https://bugs.freedesktop.org/attachment.cgi?id=125244&action=edit
dmesg from drm-intel-nightly

kernel: drm-intel-nightly 2016-07-21 (0042917de891b1783da8efd312f46a0a306ed7d5)
OS: Fedora 24
architecture: x86_64
hardware: ASRock N3700-ITX (BIOS version 1.7)


DisplayPort signal working during grub and boot, but goes "black" once reaching
gdm. It is the same behavior when using normal fedora kernel, or latest
drm-intel-nightly (dmesg with drm.debug=0x1e attached).
This seems to happen after every reboot.

One thing with the "black screen" which I find peculiar, is that the signal
seems somehow borked. It's not totally "no signal", the monitor continue to use
the DP input, but it's also not anything to display so the monitor goes into
some sleepish mode (this "black screen" state then effectively prohibit any of
the monitors OSD menus to work for as long as the DP is connected).


If booting with additional kernel parameters "nomodeset i915.modeset=0", the
DisplayPort signal seems to mostly work; I can see the gdm login screen, and I
can login. When hitting enter at the login screen, I then experience a screen
freeze behavior which can be "resolved" by hitting Ctrl-Alt-F2 (which, instead
of, as I normally would expect, giving me the text terminal, sort of "refreshes
the state of the screen" after which, the login proceeds as normal).

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