Hello Experts,
I managed to install leap15.4 on my old laptop, but got almost daily kernel crashes. I could not find any clue in the traces or by the operation executed at the time of the crash.
good news: based on earlier experience I managed to install a 5.19 kernel as multiboot. That seems to fix the problem for a week now 
All I had to do is:
- adapt zypp.conf to multiboot (not sure if it was already)
- add the backport repo https://download.opensuse.org/repositories/Kernel:/stable:/Backport/standard/
- install the kernel as offered from backport
- reboot and select the new kernel
what I found disturbing:
- I found many outdated tutorials pointing to non-existing or renamed repos describing the technique.
- I adapted that info to leap15.4 and failed when installing the kernel from kernel:stable. From the zypper message I could only guess the reason: kernel:stable does not work with leap15.4 !
- I was not sure if that backport I then found was really meant to be used for leap15.4
my analysis:
- Naming rules (I guess they exist) for repo-urls are not applied as strictly and generically as they were before.
- Some tutorials try to use generic repo urls, but the given zypper commands of course dont work this way. A waste of resources, because the tutorials themselves appear correct.
- kernel:stable appeared unexpectedly specific to tumbleweed. Are there more repos specific to releases without that being visible in their URL ?
I know similar issues from many software projects where release planning is not thoroughly done in advance (which is a hard job anyway).
I guess the experts are aware of that, I simply want to point it out my way in the hope it helps someone somewhere sometimes.
PS: another wish: I would have preferred to install a backported 5.18 because of the good feedback I could find. But for some reason it is not available in that backports repo anymore. Does that help anybody ?