[Bug 1785033] [NEW] GRUB needs to support 64-bit efi linear frame buffer address
Launchpad Bug Tracker
1785033 at bugs.launchpad.net
Thu Aug 16 03:57:57 UTC 2018
You have been subscribed to a public bug by Anthony Wong (anthonywong):
More firmwares support above 4G mmio configureation and the EFI Graphics Output Protocol can return a 64-bit linear frame buffer address have been implemented in some firmware/BIOS. Grub2 currently only pass 32-bit framebuffer base to kernel. The Linux kernel has already added support to handle 64-bit linear framebuffer address in the efifb driver now. So GRUB2 should support 64-bit EFI linear frame buffer address.
Some machines block booting with firmware/bios implemented 64-bit EFI linear frame buffer address,due to Grub passing incorrect(only 32-bit) EFI linear frame buffer.
Need Bios/Firmware support,
1) Make sure the machine with the Bios implemented 64-bit EFI linear frame buffer address. some machine need to enable above 4G mmio on bios setup menu.
2) Boot up.
A patch has been committed and accepted by maintainer
** Affects: grub2 (Ubuntu)
** Tags: patch
GRUB needs to support 64-bit efi linear frame buffer address
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