[Bug 110677] Can't invert screen colors by adjusting the gamma ramp

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110677

            Bug ID: 110677
           Summary: Can't invert screen colors by adjusting the gamma ramp
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: vladzzag at gmail.com

On X11, there are several ways KWin can invert screen colors: either by using
an OpenGL-based effect, or by adjusting the gamma ramp. While the former
approach works well on most hardware, we experience some issues with the latter
approach on AMD hardware.

After adjusting the gamma ramp, the screen is filled with mostly white color.

Steps to reproduce:
* Open System Settings, go to Shortcuts, select KWin component under Global
Shortcuts tab, assign custom shortcut to "Invert Screen Colors";
* Press the shortcut.

(or just use xcalib -i)

Observed results:
The screen is filled with mostly white color.

Expected results:
Inverted screen.

Hardware: Radeon RX 580
Mesa: 19.0.3
Linux: 5.0.13
xorg: 1.20.4

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