Reverting kernel latest

The last two kernel latest break my Sound when Screensaver is activated, i do not know how to revert back to stable and was wondering where to find some info.

Looked around and see entries are in grub.cfg there is no xen.cfg, thought i manually set the kernel to boot but i do not want to end up with unbootable system.
In need of wisdom.

You can choose which kernel to use in GRUB menu. Also you can configure GRUB to remember the last entry you booted from:
To regenerate GRUB after editing /etc/default/grub if you use BIOS boot:
grub2-mkconfig -o /boot/grub2/grub.cfg
Or if you use UEFI boot:
grub2-mkconfig -o /boot/efi/EFI/qubes/grub.cfg

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Thanks that helped to also make some additional changes.
Removed gfxterm which was lagging the hell out of high resolution grub.