console corruption issues and solution

[psy0rz]

ZFSBootMenu build source

Release EFI

ZFSBootMenu version

2.3.0

Boot environment distribution

Alpine

Problem description

On an older box (HP microserver gen 8) i had some console font corruption issues.

After hours of debugging i found the solution(s):

1. (not a zfsbootmenu issue) I had to blacklist the radeon module, otherwise there would be no output at all at a certain point.
2. Using boot parameter zbm.autosize=0 made the issue better: This prevents the whole screen from shifting/wrapping up 3 rows.
3. Using boot parameter rd.vconsole.font=none solved the characters from being corrupt. (autosize=0 isnt needed anymore at this point)

So i would suggest making rd.vconsole.font=none a suggestion as default option, in case people experience these problems.

I cant believe how much stuff i had to do to get simple console output on this box :)

Steps to reproduce

1. Insist on using too obsolete hardware
2. Be stubborn.