[Bug 90861] [SNB/HSW/BSW/SKL bisected] black screen on DP+eDP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90861

--- Comment #20 from Andreas Reis <andreas.reis at gmail.com> ---
Created attachment 116364
  --> https://bugs.freedesktop.org/attachment.cgi?id=116364&action=edit
dmesg with drm.debug=0x1f log_buf_len=4M

@Jani Nikula: Verified by bisection that it's indeed the same commit causing
issues on my 4200U.

The patch does not work for me, neither applied to current nightly +
unify-flip-modeset (attached dmesg) nor applied to unify-flip-modeset only.

NB: My 4770 (HDMI 1080p + HDMI 1440p on IGP) has a new minor issue: Now at boot
only one screen shows the tty. If I start X and switch back to tty, both again
show the same tty output. Since it's minor, nothing wrong in dmesg and for lack
of time I won't test further if it's due to the same cause.

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