[Bug 101321] New: [DP] [KBL] testdisplay -a have flockering resolution "1920x1080i"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101321

            Bug ID: 101321
           Summary: [DP] [KBL] testdisplay -a have flockering resolution
                    "1920x1080i"
           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: maria.g.perez.ibarra at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131741
  --> https://bugs.freedesktop.org/attachment.cgi?id=131741&action=edit
dmesg.log

==Bug detailed description==
--------------------------------------------------
this test has flickering in the following configuration
testdisplay -a

==Steps to reproduce==
--------------------------------------------------
./testdisplay -a

==Actual results==
--------------------------------------------------
the status is "pass" but visually the following resolutions have flickering
when they are tested by the script.

1920x1080i at 60hz
1920x1080i at 50hz

   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
======================================
        Graphic drivers
======================================
modesetting                 : modesetting_drv.so
xorg-xserver                : 1.19.3
libdrm                      : 2.4.81
vaapi (intel-driver)        : Intel i965 driver for Intel(R) Kabylake - 1.7.3
cairo                       : 1.14.8
xserver                     : X.Org X Server 1.19.99.1
intel-gpu-tools (tag)       : intel-gpu-tools-1.18-211-g00ce341b
intel-gpu-tools (commit)    : 00ce341b

======================================
             Hardware
======================================
platform                   : KBL-Nuc
motherboard model          : MS-B142
motherboard id             : MS-B1421
form factor                : Desktop
manufacturer               : Micro-StarInternationalCo.,Ltd.
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
gpu card                   : Intel Corporation Device 5916 (rev 02) (prog-if 00
                                                                               
                             [VGA controller])
memory ram                 : 7.65 GB
max memory ram             : 64 GB
cpu thread                 : 4
cpu core                   : 2
cpu model                  : 142
cpu stepping               : 9
hard drive                 : 111GiB (120GB)
current cd clock frequency : 540000 kHz
maximum cd clock frequency : 675000 kHz
displays connected         : DP-1

======================================
             Firmware
======================================
dmc fw loaded             : yes
dmc version               : 1.1
======================================
             kernel parameters
======================================
quiet splash fastboot drm.debug=0xe

==Attachments==
--------------------------------------------------
dmesg.log

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