[Bug 108832] Cursor flickering on switching between cursor types

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108832

            Bug ID: 108832
           Summary: Cursor flickering on switching between cursor types
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: marlock9 at gmail.com

Copy of https://bugs.kde.org/show_bug.cgi?id=400097

Creating bug here because with help of KDE developer I have investigated it is
amdgpu bug.

For example, I'm moving cursor arrow on text. Before it turns to "I" for text
selecting I clearly see the intermediate cursor texture (can't see what type is
it) located right or left from current cursor position. Same when I moving
cursor arrow to the border of screen to resize. It looks like glitch or
flickering.

It's lasting for about 2 years on different distributions.

https://drive.google.com/file/d/1bV7okri0I95tkCOqo-6Z-axnN3-BXk9U/view?usp=sharing

Above is link to a slo-mo video. You can clearly see what's happening when I'm
moving cursor straight down from text:
1. "I" cursor
2. Arrow cursor appears 5 px left from "I" cursor
3. Arrow cursor leaps to the 15 px right-down diagonal

On the monitor it looks like flickering jumping of cursor.

amdgpu 18.0.1
libdrm-amdgpu1 2.4.91
linux 4.19.0
Radeon RX 570.

So, kde developer said:

"The issue is very likely in the video drivers, possibly not correctly
syncronizing cursor position and cursor shape updates. I suggest to report it
to the developers of your video drivers (your distribution might help to locate
these)."

Finally, I have some experiments with video driver settings and I have no
issues with such options in 20-amdgpu.conf:

Option "SWcursor" "true"
Option "TearFree" "true"

Truly said, only enabling SWcursor is enough for get rid of this bug but right
after appears so much tearing (due to "KMS Pageflipping: disabled because of
SWcursor" I suggest) so I needed to enable TearFree.

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