[CentOS] After update to 8 (2004) ... system is unbootable - UEFI Secure boot

Thu Aug 13 21:05:54 UTC 2020
Leon Fauster <leonfauster at googlemail.com>

Am 29.07.20 um 20:43 schrieb Leon Fauster:
> Am 16.06.20 um 22:04 schrieb Fabian Arrotin:
>> On 16/06/2020 15:06, Leon Fauster via CentOS wrote:
>>> Hi all,
>>>
>>> I updated a Dell XPS laptop from CentOS 8.1 (1911) to 8.2 (2004).
>>>
>>> Installed kernels are
>>> kernel-4.18.0-147.5.1.el8_1.x86_64
>>> kernel-4.18.0-147.8.1.el8_1.x86_64
>>> kernel-4.18.0-193.6.3.el8_2.x86_64
>>>
>>> Unfortunately I can not boot into the latest
>>> kernel-4.18.0-193.6.3.el8_2.x86_64.
>>>
>>> After grub2 screen I only see following line:
>>>
>>> EFI stub: UEFI Secure Boot is enabled
>>>
>>> Booting into the older kernel is still possible. The
>>> above line appears and after that the normal kernel
>>> output scrolls over the screen (rhgb quiet disabled).
>>>
>>> Is the new kernel correctly signed?
>>>
>>> What can I do?
>>>
>>> -- 
>>> Thanks
>>> Leon
>>
>> Hi Leon,
>>
>> Don't think that it's due to secureboot, as on my work laptop (thinkpad
>> t490s), I have secureboot on, and kernel working fine.
>>
>> OTOH, on my family laptop (also in secureboot mode), when I updated from
>> 8.1.1011 to 8.2.2004, laptop became unresponsive during the
>> microcode_ctl update (in scriptlet) and after that it auto-reset itself
>> , so in the middle of the whole rpm transaction.
>> I tried to recover it but it was to a point where it was faster to just
>> reinstall from scratch with 8.2.2004, which I did ... and in gnome,
>> everything was fine, etc (adding repo, pkgs) but then on the *same*
>> kernel it was installed with, just tried a reboot, and nothing  : grub
>> shows menu, you select kernel and on upper left there is only cursor
>> (fixed) and nothing happens ..
>>
>> I'll try to diagnose what's the issue as actually that means troubles
>> with family using that laptop :)
> 
> 
> Did you got managed to boot kernel-4.18.0-193.14.2.el8_2 or a newer one?
> I must still boot into kernel-4.18.0-147.8.1.el8_1.x86_64 ... and with 
> the upcoming new kernel that depends on a new shim and grub2 package I 
> wonder about the implications for my XPS hardware ...
> 


JFYI: latest (kernel-4.18.0-227.el8.x86_64) 8-stream kernel is
bootable on this machine ... (full updated (C8.2.2004) with latest
shim, grub2 stuff. Just the kernel is from 8-stream) ...

--
Leon