[Bug 106935] New: [CHV] Mouse cursor flicker on external display, rendering artifacts under cursor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106935

            Bug ID: 106935
           Summary: [CHV] Mouse cursor flicker on external display,
                    rendering artifacts under cursor
           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: russianneuromancer at ya.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140179
  --> https://bugs.freedesktop.org/attachment.cgi?id=140179&action=edit
debug dmesg with drm-tip kernel

Hello!

I find that mouse cursor is always flicker on external displays attachable to
CherryTrail-based Dell 5855 tablet. 

modesettings DDX (Ubuntu Defaut) - cursor flicker frequently on all movement,
artifacts under cursor, sometimes long tail (for example above terminal window
with changing content, or above Nautilus that render loading animation) link to
video is below
Intel DDX, DRI3 - same as with modesetting DDX.
Intel DDX, DRI2, HWCursor - cursor flicker when content below cursor is
changes, but don't left tail
Intel DDX, DRI2, SWCursor - almost same as HWCursor, but seems like cursor
flickering start not after boot or after web-browser, Nautilus or terminal
launch, but few minutes later.

Video for DRI3 variant of this issue:
https://mega.nz/#!JNpBharA!giDibmmE9he9NkqR13pGncLrxCCZhoIY27K3cU7vRsY (please
pay attention to the ending).

Attached dmesg debug from boot with Intel DDX, DRI3 (moving gnome-recorder
above htop, then just moving cursor above htop, cursror left very long tail).

Hardware:
Dell 5855 tablet with Intel Atom x5-Z8500
Tested docking soltuions:
1. Dell Dock WD15
2. Dell S2718D display attached to tablet directly via USB-C
3. Belkin USB-C 3.1 Express Dock HD
No difference was found, cursor flicker with all three. However, there is no
such issue if I attache Skylake and KabyLake-based laptops to listed docks.

Software:
Ubuntu Gnome 17.04-18.04 x86_64
Linux 4.11-4.17.1, drm-tip/2018-06-16
(02d8db1a894b0e646b2debd64ce24b8e99fd2ffd)
Mesa 1.17.0-18.0.0rc5
libdrm: 2.4.80-2.4.91
xserver-xorg-video-intel: 2.99.917+git20170309 - 2.99.917+git20171229
xserver-xorg-core: 1.19.3-1.19.6

As far I know this is not regressions, as I seen this issue at least 1.5-2
years ago, display support starting to work on this tablet (before there was
just black screen).

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