https://bugs.kde.org/show_bug.cgi?id=357543
Bug ID: 357543
Summary: drmModeSetCrtc not called when presenting GBM buffer
(Wayland)
Product: kwin
Version: 5.5.2
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: grave
Priority: NOR
Component: backend-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: j...@jcornwall.me
DrmBuffer uses both DRM (for m_blackBuffer) and GBM to allocate framebuffers.
drmModeSetCrtc is only called when the buffer stride changes. However, the DRM
and GBM buffers have different tiling configurations (with identical strides)
on drm/radeon. It is invalid to call drmModePageFlip when switching between
these two buffer types without first calling drmModeSetCrtc.
This currently results in corrupted visual output with KWin/Wayland. Adding a
call to drmModeSetCrtc when first switching from the DRM buffer to the GBM
buffer fixes the issue.
Reproducible: Always
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