Bug 1949210

Summary:	mac hangs indefinitely at gray screen following shim update
Product:	[Fedora] Fedora	Reporter:	Chris Murphy <bugzilla>
Component:	shim	Assignee:	Peter Jones <pjones>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	34	CC:	mjg59, pjones
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	shim-x64-15.4-4.x86_64	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-04-30 19:30:57 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Chris Murphy 2021-04-13 17:36:16 UTC

Description of problem:

Macbook Pro (2011, intel mac) and similar models, will hang indefinitely at a gray screen. No GRUB, no errors. Just a gray (possibly black) screen.

Version-Release number of selected component (if applicable):
shim-x64-15.4-3.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Boot
2.
3.

Actual results:

Boot chime -> gray screen -> indefinite hang at that gray screen

Expected results:

GRUB menu should appear and/or the system should boot and startup to a login prompt.

Additional info:

This bug has been identified and fixed in shim-unsigned-x64-15.4-3.fc33 and newer and will be fixed in an imminently released shim which all mac users will get by default (eventually). But in the meantime, you might want to get back to the older working shim so you can boot!

1. Boot any Fedora 34 or older netinstaller, live, edition or spin from a USB drive. The one image that will NOT help you is the special shim/grub test day image (either of them). But an ISO from Fedora 33, 32, 31... will work.

2. Use 'lsblk -f' or 'sudo blkid' to find a small HFS+ volume that's used as an EFI System partition on Fedora installations on Macs. This is typically a 200M-600M partition by default. Mount this volume to /mnt.

3. Replace the new shim on the computer's ESP with the old shim on the USB stick:

cp /run/initramfs/Live/EFI/BOOT/BOOTX64.EFI /mnt/EFI/BOOT/BOOTX64.EFI
cp /run/initramfs/Live/EFI/BOOT/BOOTX64.EFI /mnt/EFI/fedora/shim.efi
cp /run/initramfs/Live/EFI/BOOT/BOOTX64.EFI /mnt/EFI/fedora/shimx64.efi

You should get an overwrite confirmation for each of these.