[Bug 221148] New: Regression: Screen tearing on AMD RX 6800 with amdgpu on Linux 6.19.x (works fine on 6.18.9)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221148

            Bug ID: 221148
           Summary: Regression: Screen tearing on AMD RX 6800 with amdgpu
                    on Linux 6.19.x (works fine on 6.18.9)
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: f@6610199.xyz
        Regression: No

**Kernel Versions Tested**

Good: linux-6.18.9 (no tearing)
Bad: linux-6.19.1 ~ linux-6.19.4 (visible tearing in 3D games)


**Hardware**

GPU: AMD Radeon RX 6800
Driver: amdgpu
Display: 1920x1080@75Hz
Connection: DisplayPort


**Software Environment**

- Session: X11 only
- Desktop: XFCE 4 (started via startx, no display manager)
- Game example: Nioh 3 (via Steam Proton)


**Symptom**

After upgrading from 6.18.9 to any 6.19.x release, obvious screen tearing
appears in 3D games (classic vsync-off appearance).  
The tearing is most noticeable when the viewport moves vertically (e.g. looking
up/down in-game).


**Reproduction Steps**
1. Boot with Linux 6.19.4 (or any 6.19.x)
2. Start X11 session (XFCE via startx)
3. Launch Nioh 3 via Steam Proton (default settings with VSync OFF or ON)
4. Move the camera/viewport vertically → observe horizontal tearing lines


**Workaround that eliminates the tearing**

Create or edit:
/etc/X11/xorg.conf.d/20-amdgpu.conf

```
Section "Device"
    Identifier "AMD Graphics"
    Driver "amdgpu"
    Option "TearFree" "true"
EndSection
```
However, it introduces a small performance overhead or input latency.
On 6.18.9, no such configuration was needed.

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