rain_saver(): set_video_mode() return value ignored — on blank-time failure vid aliases the stale 32KB text window and the 64000-byte bzero + drop-fill overrun it into 0xC0000+, while blanked/vid state commits as if the saver were active (DF-5114/DF-5197/DF-5198 family twin, last saver)

Summary

The last family twin: on failure the 64000-byte bzero + drop-fill march ~30KB past the text window into 0xC0000+ (DMAP-mapped so no fault), plus blanked/vid commit so syscons keeps ticking against a text-mode DAC. Latent (root kldload + VGA console + blank-time divergence). Check-and-bail fix (mirror of the dragon/warp/fire twins).