booted both 4.15.0-47.50 and 4.18.0-17.18 kernels; blanked screen for both kernels, and after unblanking checked dmesg; the kernel warnings were not shown.
booted both 4.15.0-47.50 and 4.18.0-17.18 kernels; blanked screen for both kernels, and after unblanking checked dmesg; the kernel warnings were not shown.