[Bug 109332] New: xf86-video-amdgpu - commit 0d60233d introduced stuttering with mouse cursor operations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109332

            Bug ID: 109332
           Summary: xf86-video-amdgpu - commit 0d60233d introduced
                    stuttering with mouse cursor operations
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: tempel.julian at gmail.com
        QA Contact: xorg-team at lists.x.org

Originally reported inside this ticket:
https://bugs.freedesktop.org/show_bug.cgi?id=106175#add_comment

---

There is stuttering caused by certain mouse cursor operations. To reproduce,
e.g. do this:

-disable Plasma compositing with Ctr + Alt + F12 (or in the compositor settings
and log out and in again)
-get the latest Compton release by yshui: https://github.com/yshui/compton
-start Compton (Mesa still enables vsync automatically in the latest release,
this has changed with compton-git)
-open a Dolphin window and www.vsynctester.com in webbrowser
-now click Dolphin's title bar, move it a bit, release it and repeat the
procedure several times in a row
-there should be stutter happening in the vsynctester.com browser window

-now quit Compton and start it with "vblank_mode=0 compton" to enable GLX
compositing without vsync
-now the repeatedly moving Dolphin's window procedure described above shouldn't
lead to any stutter
-when booting with amdgpu.dc=0, there also shouldn't be any stutter when vsync
is kept enabled

This bug was introduced with this commit:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/commit/0d60233d26ec70d4e1faa343b438e33829c6d5e4

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