The function drm_output_start_repaint_loop() unconditionally issues a page flip, even if the crtc for that output has not been enabled yet. That causes the page flip to fail, and drm_output_repaint() is never called. Solve this by bypassing the initial page flip if the output needs a mode set. This has the caveat of affecting latency predictability for that first frame and when a "driver" mode fullscreen surface causes a mode set. However, on both cases the mode set would take an unpredictable amount of time anyway. https://bugs.freedesktop.org/show_bug.cgi?id=63812 https://bugs.freedesktop.org/show_bug.cgi?id=64183
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