[Bug 91974] New: [bisected] unrecoverable black screen after killing X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91974

            Bug ID: 91974
           Summary: [bisected] unrecoverable black screen after killing X
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: freedesktop-bugs-79382 at khumba.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118208
  --> https://bugs.freedesktop.org/attachment.cgi?id=118208&action=edit
dmesg after killing X

7d9a746 - (refs/bisect/bad) sna: Be robust in handling DPMS failures (3 months
ago) <Chris Wilson>

This commit starts causing problems with my laptop's Intel card.  If I close an
X session by letting xinitrc finish, then I'm returned to the login screen
without problem.  If I kill the X process or stop it via systemctl, then my
laptop display turns off and won't turn back on short of a reboot: starting X
again, and closing the lid, don't help.  (I didn't try suspending.)

The laptop's built-in display is seen as eDP1.  If there are other displays
attached via HDMI or DP, they continue functioning normally, in console mode
and X.  I don't see anything out of the ordinary in the logs.

Machine:

$ uname -a
Linux mikasa 3.18.21 #1-NixOS SMP Thu Jan 1 00:00:01 UTC 1970 x86_64 GNU/Linux

- X Server version 1.17.2

- ASUS N550JK with dual Intel and NVIDIA graphics (only Intel active).

- The xrandr output is from a normally functioning session (from the commit
prior to this bad one).

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