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I can boot again without having to set NOMODESET..... using 5.10 RC1 kernel!
Kernel 5.10 seems to fix the issue.

I did this:



mkdir kernel_5_10_RC_1
cd kernel_5_10_RC_1
wget -c...

As I stated above I tried booting of both Groovy and the lastest Manjaro, both present me with a black screen on boot. (LiveUsb)
I didn't try safe graphics which seems to set NOMODESET upon...

I passed them interactively.
That's how i found out using nomodeset also works on 5.8
But no external monitor support and terrible screen tearing.

Graphics card info (booted with kernel 5.4)



00:02.0 VGA compatible controller [0300]: Intel Corporation Iris Pro Graphics 6200 [8086:1622] (rev 0a) (prog-if 00 [VGA controller])
...

I have an identical external SSD which I used to try some other distro's.
Booting from USB for Ubuntu 20.10 installation and Manjaro also fail exactly the same way.

They both have a kernel >...

Thanks for the update DuckHook!

This is the output from syslog for one boot.
https://pastebin.ubuntu.com/p/CnnK98H2sT/

Maybe some relevant extra info.
I boot from an external SSD.

I recently upgraded my iMac (late 2015 with Intel 6200 integrated graphics) from 20.04 to 20.10.
After installation i am greeted with a black screen.

I only seem to b able to boot with the old...