[Bug 97531] [Broadwell] Second external monitor of MST setup does not turn on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97531

--- Comment #3 from darkbasic <darkbasic at linuxsystems.it> ---
Created attachment 126647
  --> https://bugs.freedesktop.org/attachment.cgi?id=126647&action=edit
dmesg_drm.debug

I have issues when turning on external monitors on miniDP MST: the "secondary"
monitors of the MST setup doesn't turn on. I can turn it on by going through a
dpms cycle (waiting for power management to set both screens into dpms mode,
then move the mouse to exit dpms). Another way to turn the "secondary" monitor
on is disabling and re-enabling it once again.

I attached dmesg with drm.debug=14 and 4.8.0-1-drm-intel-nightly.

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