[Bug 98908] New: [IVB] Unreliable handling of 3 displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98908

            Bug ID: 98908
           Summary: [IVB] Unreliable handling of 3 displays
           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: dorota.czaplejewicz at collabora.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Connecting all 3 displays to a desktop IVB (i7-3770) doesn't work reliably.
Results range from image corruption (by shifting), to never waking up one of
the displays (always the one on DisplayPort in my tests).

Xrandr shows all displays as connected, with the correct resolutions.

Changing the on/off state of a single display causes all to flicker, unlike
with 2 displays.

In the case of all 3 screens being active (when all available at boot - some
corrupted), using xrandr to turn off and back on the one assigned to CRTC2
fails on enabling.

Switching between VTs works for one cycle Xorg -> tty -> Xorg. Following
attempts leave the screens blank.

Unfortunately, I don't have access to the logs right now.

Configuration tested:
CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
Motherboard: ASRock H77 Pro4/MVP
Displays: DP (DVI) + DVI + VGA
OS: Fedora 24
Kernel: 4.8.8-200.fc24.x86_64

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