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In the atomic update callback, ast should call drm_gem_fb_begin_cpu_access() to make sure it can read the framebuffer from the CPU, otherwise the data might not be there due to cache, and synchronization. Tested on a Lenovo SE100, while rendering on the ArrowLake GPU with i915 driver, and using ast for display. Suggested-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patch.msgid.link/20251030091627.340780-1-jfalempe@redhat.com Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>