[Bug 283123] loading i915kms causes black screen (as per open issue)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283123

--- Comment #20 from Michael <mw@weis.xyz> ---
I thought to summaries what I would have done if I had fully understood the
bullet point under open issues from the 14.2. errata
(https://www.freebsd.org/releases/14.2R/errata/) i.e.:
- drm-kmod packages compiled on FreeBSD 14.1 result in the text console being
inoperative when the kernel module is loaded. Recompiling the package from the
ports tree will restore the lost functionality. This issue will also resolve
itself after the FreeBSD 14.1 EoL, when packages for 14-STABLE will start being
built on FreeBSD 14.2-RELEASE.

pre-upgrade steps for people using binary packages like me:
1) if you are using /etc/rc.conf to load i915km - comment it out i.e.:
   #kld_list="i915kms ..."

upgrade as per the 14.2. release instructions:
   https://www.freebsd.org/releases/14.2R/installation/#upgrade-binary

post-upgrade tasks:
1) Make sure you have the 14.2 source code and the latest ports code downloaded
(required to recompile drm-kmod). P.S. If you already have files in this
folders and are not sure you have the right version, I would just delete them
all.
   cmd for source code: git clone --depth=1 --branch releng/14.2
https://git.FreeBSD.org/src.git /usr/src
   cmd for ports code: git clone --depth 1 https://git.FreeBSD.org/ports.git
/usr/ports
2) Un-installed drm-kmod package and all dependencies:
   cmd: pkg delete drm-kmod
   cmd: pkg autoremove
3) Compile drm-kmod:
   cmd: cd /usr/ports/graphics/drm-kmod
   cmd: make install clean
4) Test if the new version is working 
   cmd: kldload i915kms
5) if all is working, un-comment line in /etc/rc.conf again i.e.
   kld_list="i915kms ..." 
6) Reboot your system

Alternatively you can just wait until eol of 14.1. which will be end of March
2025 approx. as mentioned in the errata above.

Hope this helpful.

P.S. If I missed anything please feel free to correct me.

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