How do I change a kernel option?

[Walter Zambotti]

I am unable to configure Xorg to ignore (and stop using as its default) the None-1 video device causing me not to be able to display a desktop via the HMDI-1-1 device.

 

It has been suggested (https://ubuntu-mate.community/t/how-to-configure-xorg/26732/3) that I disable this device in the kernel, hopefully, via a kernel option such as :

 

video=None-1:d

 

Does anyone know where (which file) and how (specific method) I should do this?

[Werner]

You can try to edit /boot/boot.cmd. Search for the line starting with setenv bootargs and add this at the end. Then recompile the boot script with the command mentioned at the end of this file.

[Walter Zambotti]

So I edited the boot.cmd file and added this line after each of the setenv bootarg ... lines :

setenv bootargs "${bootargs} video=None-1:d"

 

recompiled with

sudo mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr

 

checked the lines had made it to boot.scr and rebooted.

 

But the None-1 video device still persists and xrandr still shows that device is being used by Xorg!!!

[Walter Zambotti]

it turns out this mystery video device (None-1) is provided by Kernel 6.1.30 and revertiong back to 6.1.11removes the device.