On Fri, 2020-07-31 at 22:35 +1200, Alan McRae via CentOS wrote:
I am running an Intel x64 machine using UEFI to boot an SSD.
Installing the latest yum update which includes grub2 and kernel 4.18.0-193.14.2.el8_2.x86_64 renders the machine unbootable, blank screen where grub should be, no error messages, just hangs.
After some hours I managed to modify another bootable partition (containing older software) and boot it from there.
After that, I found out it is a known problem.
The main point of this message is to make people aware of the problem and suggest admins don't run 'yum update' until they understand the problem and have a fix at hand.
See 'UEFI boot blank screen post update' for a solution and directions to the redhat article.
Regards
Alan
I have been punished by this bug - it is/was very nasty.
I will chase up your reference but attach my trouble shooting in case its useful to anyone
John