Sorry, but after upgrading the kernel to 4.13.0-36, the screen went bad again. Even booting with the old kernel did not work anymore. But the GRUB_GFXPAYLOAD_LINUX=text solution worked...
Sorry, but after upgrading the kernel to 4.13.0-36, the screen went bad again. Even booting with the old kernel did not work anymore. But the GRUB_GFXPAYLOAD _LINUX= text solution worked...