Comment # 17 on bug 1210208 from Tom de Vries

(In reply to Takashi Iwai from comment #15)
> The easiest way would be to get kernel-default.rpm, kernel-default-extra.rpm
> and kernel-default-optional.rpm from OBS Kernel:SLE15-SP5 repo
>   http://download.opensuse.org/repositories/Kernel:/SLE15-SP5/pool/
> and install them just on top of your existing Leap 15.4 system.  The repo
> contains the build from the latest git branch.
> 

Thanks, that's very helpful :)

Done:
...
$ uname -a
Linux xerxes 5.14.21-150500.104.g4bab92a-default #1 SMP PREEMPT_DYNAMIC Wed Apr
5 14:36:13 UTC 2023 (4bab92a) x86_64 x86_64 x86_64 GNU/Linux
...

> The known drawback is that it's an unofficial build, hence it'll be
> difficult to boot with Secure Boot.

That's not a problem for me.

> The firmware might be needed, but I guess it's still OK for i915 without
> updating.

Ok, let's see how this goes, and if I still run into trouble I'll mess with the
firmware.