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UEFI boot ignoring vga= kernel parameter

Posted: 17 Feb 2016, 04:11
by vanepp
I'm trying to set the video resolution to vga=769 (640*480*8) for a backup script using dialog on 4.7.1. While this works fine for non UEFI boot (using the /mnt/custom/customcd/isoroot/isolinux/isolinux.cfg file) it doesn't seem to work when I modify /mnt/custom/customcd/isoroot/boot/grub/grub-471.cfg (which seems to be the UEFI config) to add it like this:

menuentry "SystemRescueCd (64bit, default boot options)" {
linux /isolinux/rescue64 docache nonet nonm nodhcp setkmap=us nomodeset vga=769
initrd /isolinux/initram.igz

While this boots, the screen resolution is set to something like 1024*768 rather than the desired 640*480. As well (as noted elsewhere) the no networking parameters also don't work any more, this happily obtains and activates a DHCP network connection (which it didn't in past versions). Can someone tell me what I need to do to get the video mode set to 640*480 for UEFI please?

Peter Van Epp