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Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and buffer size. Align the pitch to a multiple of 256. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Lyude Paul <lyude@redhat.com> Cc: Karol Herbst <kherbst@redhat.com> Cc: Lyude Paul <lyude@redhat.com> Cc: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20250821081918.79786-15-tzimmermann@suse.de