The latest Mga9 kernel (kernel-6.6.14-desktop-2), while running on an older laptop (and my Cauldron machine), has caused problems on my i7-1051U laptop, running slow, leaving the touchpad less responsive, and generally making life impossible. The prior kernel functioned perfectly, and I wanted to switch to that, but the "Advanced options" on the grub menu is not working. When I selected, a terminal window opens asking for a username and password (before login???), which does nothing.
I have looked at the config files and they seem fine (showing 3 kernels available). I have since run both grub-mkconfig and grub2-reinstall to no avail. I still cannot access the earlier kernels from grub and am not sure what more to do.