I'm not sure if this is a bug or not, and would appreciate input on the
matter.

Whenever I boot my machine, the GRUB boot menu looks normal, but
everything textual following that (crypto unlock prompts, service
startup messages, etc.) is completely distorted. For example, here is
the prompt to enter the decryption password:

https://filepost.io/d/wiG25b3pN1

I suspected an issue with the 2560x1440 of my monitor, and indeed: the
problem went away with a 1920x1080 monitor.

Interestingly, the problem also went away once boot was complete.
Switching to a tty with e.g.: Ctrl+Alt+F1 presented everything in order.

Does anyone have an idea what could be going on (bug, or some EDID issue
with my monitor?) and more importantly, how to fix it?

Christian

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On 2022-01-01 13:43, Christian Kastner wrote:

I'm not sure if this is a bug or not, and would appreciate input on the matter.

Whenever I boot my machine, the GRUB boot menu looks normal, but
everything textual following that (crypto unlock prompts, service
startup messages, etc.) is completely distorted. For example, here is
the prompt to enter the decryption password:

https://filepost.io/d/wiG25b3pN1

That screenshot is now gone, but here is a similar post:

https://forums.freebsd.org/threads/distorted-image-in-console-after-enabling-amdgpu.74153/

I suspected an issue with the 2560x1440 of my monitor, and indeed: the problem went away with a 1920x1080 monitor.

Interestingly, the problem also went away once boot was complete.
Switching to a tty with e.g.: Ctrl+Alt+F1 presented everything in order.

Does anyone have an idea what could be going on (bug, or some EDID issue
with my monitor?) and more importantly, how to fix it?

Just to share my resolution: it turns out I was misconfiguring the
module in /etc/modprobe.d/amdgpu.conf. I completely forgot that I even
created that file.

It was passing the dc=0 parameter to the module, I believe to address
some issue I was experiencing with the amdgpu driver years ago.

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