[Bug 101390] New: [DP] [BDW] Error with display test using MST dongle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101390

            Bug ID: 101390
           Summary: [DP] [BDW] Error with display test using MST dongle
           Product: DRI
           Version: XOrg git
          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: ricardox.madrigal.maldonado at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131894
  --> https://bugs.freedesktop.org/attachment.cgi?id=131894&action=edit
dmesg

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==Bug detailed description==
--------------------------------------------------
When script test start for testing display, screen only show some resolutions
and after that send a blank screen.
If you disconnect and connect the DP from platform, the video works again.

This happen with configuration (mini DP to DP) + (DP to DP) with monitor 4K and
a MST dongle "sunix"

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==Steps to reproduce==
--------------------------------------------------
1. Connect platform to DP using required dongle
2. Turn device ON
3. Enter in text mode and login with your credentials
4. run test "testdisplay -a" or "testdisplay -t"  or "testdisplay -d 16" or
"testdisplay -d 24"

--------------------------------------------------
==Actual results==
--------------------------------------------------
Platform only show some resolutions and then send a blank screen.
dmeg shows some linktrainning issues and some FIFO undergrounds: 
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

-------------------------------------------------
==Expected results==
--------------------------------------------------
Script should start testing IGT and resolutions tested should not have
corruptions, flickering or glitches.

--------------------------------------------------
======================================
             Hardware
======================================
platform                   : BDW
motherboard id             : NUC5i7RYB
form factor                : Desktop
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
gpu card                   : Intel Corporation Iris Graphics 6100 (rev 09)
(prog-if 00 [VGA controller])
memory ram                 : 15.58 GB
max memory ram             : 16 GB
display resolution         : 1600x900
cpu thread                 : 4
cpu core                   : 2
cpu model                  : 61
cpu stepping               : 4
socket                     : Socket BGA1168
signature                  : Type 0, Family 6, Model 61, Stepping 4
hard drive                 : 111GiB (120GB)
current cd clock frequency : 337500 kHz
maximum cd clock frequency : 540000 kHz
displays connected         : DP-2

======================================
             Software
======================================
kernel version              : 4.12.0-rc3-drm-tip-ww22-commit-187376e+
architecture                : x86_64
os version                  : Ubuntu 17.04
os codename                 : zesty
kernel driver               : i915
bios revision               : 5.6
bios release date           : 05/11/2017


======================================
              Kernel 
======================================
commit:  187376e


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Attaching dmesg

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