[kwin] [Bug 524128] New: kwin_scene_opengl: Invalid framebuffer status GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT on RX 7600 after upgrading to 6.7.4 (regression, fixed by downgrading to 6.7.3)

https://bugs.kde.org/show_bug.cgi?id=524128

            Bug ID: 524128
           Summary: kwin_scene_opengl: Invalid framebuffer status
                    GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT on RX 7600 after
                    upgrading to 6.7.4 (regression, fixed by downgrading
                    to 6.7.3)
    Classification: Plasma
           Product: kwin
      Version First 6.7.4
       Reported In:
          Platform: CachyOS
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: scene-opengl
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY

After upgrading from kwin/plasma-workspace 6.7.3 to 6.7.4, window compositing
breaks on every boot. The desktop loads, but windows do not behave normally
(no proper compositing/decorations) until I manually kill and restart the
compositor with "kwin_wayland --replace &", at which point everything works
correctly for the rest of the session.

Downgrading kwin and plasma-workspace back to 6.7.3 completely resolves the
issue across multiple full reboots. This points to a regression introduced
between 6.7.3 and 6.7.4.

STEPS TO REPRODUCE
1. Run KDE Plasma 6.7.4 (Wayland session) on an AMD RX 7600 (RDNA3).
2. Reboot the system normally (full shutdown/cold boot, not resume from
   suspend).
3. Log in through SDDM as usual.

OBSERVED RESULT
Windows do not work/compose normally after login. Running
"kwin_wayland --replace &" from a terminal immediately fixes it for the rest
of the session. This happens on every single cold boot while on 6.7.4.

Journal shows, right at KWin startup:

kwin_wayland[1794]: Invalid framebuffer status: 
"GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT"
kwin_wayland[1794]: Invalid framebuffer status: 
"GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT"

EXPECTED RESULT
Windows should compose normally after every boot without needing to manually
restart the compositor.

SOFTWARE/OS VERSIONS
Distribution: CachyOS Linux 
KDE Plasma Version: 6.7.4
Kernel Version: linux-cachyos 7.1.6-1
Mesa Version: 26.1.6-1
Graphics Platform: Wayland
Display Manager: SDDM

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