Black screen UEFI only if SecureBoot is enabled.

[gentoo-k19]

Hello,
I've followed Sakaki's guide
(https://wiki.gentoo.org/wiki/Sakaki%27s_EFI_Install_Guide)

I can definatly boot into the system when Secure Boot is DISABLED in the BIOS.
When it is enabled, I see black screen on the laptop, BUT if I have external monitor(s) connected I see proper output (asking for passphrase and so on.....) on the monitors (laptop screen stays blank), also back light on the screen is enabled , just no output.
I run Gentoo on Dual Videocard Laptop (Intel and NVIDIA), i belive few years back I somewhow soft disabled the Intel card.
AFAIK I've build in (not modules) support for both intel and nvidia cards in kernel.

I'm fairly new in desktop linux (I used it some time back) saying that, please let me know if you require more logs.

(dmesg) https://pastebin.com/ayMv8P48
(emerge --info) https://pastebin.com/2r89Er7B
(lspci) https://pastebin.com/GjU14hL5

[joanandk]

[gentoo-k19]

Here is dmesg with secure boot
https://pastebin.com/EjnPpj4h

Right now i do not have external monitor (and unfortunately i will not have access to one for a while) so running some of these command completely blind might present a challenge.

I removed timestamps and diff both msg's , to my untrained eye , there were no major differences.

[poe_1957]

Do you have any cpufrequency governers active ? (ondemand, conservative, performance,...).
There are issues with it. And you do not see it. (freezes... )
That's why I consider 5.4.38 not stable. in >=5.5.8 it is solved. But Gentoo is not so far.
_________________
Linuxpioneer
ALUG

[gentoo-k19]

[roarinelk]

Did you delete any of the pre-installed secure boot keys? You need to keep one
of the 2 microsoft keys in the secure boot db, because it is used to authenticate
the UEFI video bios when secure boot is on. I ran into the same issue a few years
ago, just reload the factory keys in uefi setup, replace the PK and KEK with
your keys, and _append_ your db key to DB.

[gentoo-k19]