[Bug 102499] New: i915 i5-5200U i5-5287U disconnects second external display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102499

            Bug ID: 102499
           Summary: i915 i5-5200U i5-5287U disconnects second external
                    display
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ismail at inbox247.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

GNOME 3.22 Wayland Ubuntu 17.04

Running with internal 2560 + 1 external 4k display work fine
Arranging 2560+4K externals side-by-side and internal 2560 below:
second external monitor disconnects within 10 s
(cannot have wider than 8k pixels)

disconnects means that one or all displays go black for 1 s then behaves like
they were just plugged in

sometime it works for a while
as of late: never works

Used to be lot worse, all monitors frequently disconnecting when:
updating Wayland window
moving mouse cursor across display boundary
having Wayland window straddling a display boundary

Could become eternally cyclic when disconnecting a display placed a Wayland
(Terminal) window across a display boundary, causing yet another reset

MacBook Pro 13" 2015

Using 4.12.8
Have to use Kernel 4.11.6+ due to #99295

Used to work prior to 17.04/4.10+


Log Output
Aug 31 09:55:03 c89 kernel: [686894.015206] thunderbolt 0000:07:00.0: resetting
error on 0:b.
Aug 31 09:55:03 c89 kernel: [686894.015255] thunderbolt 0000:07:00.0: 0:b:
hotplug: scanning
Aug 31 09:55:03 c89 kernel: [686894.015259] thunderbolt 0000:07:00.0: 0:b:
hotplug: no switch found
Aug 31 09:55:04 c89 kernel: [686894.514572] thunderbolt 0000:07:00.0: resetting
error on 0:b.
Aug 31 09:55:04 c89 kernel: [686894.514625] thunderbolt 0000:07:00.0: 0:b: got
unplug event for disconnected port, ignoring

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