Thank you! I was able to get that ibt=off into the parameters though unfortunately it now appears to be getting stuck on something during boot:
/dev/mapper/luks-7ab4537c-5527-46b9-8f55-52a15a940cfd: clean, 291440/62496768 files, 7309886/249971892 blocks
While something like that line would pop up previously for several seconds during the boot, it would then quickly proceed and boot fully, however I’ve left it at this stage for about 10 minutes or so and it has not progressed. Might I have not added the ibt=off to the correct place in the parameters?
E: Apologies, including where I added ibt=off probably helps. I added it to the end of GRUB_CMDLINE_LINUX_DEFAULT under /etc/default/grub, immediately before the end quote on that line, then used grub-mkconfig -o /boot/grub/grub.cfg and rebooted after that.
EE: I did find Stuck on "... clean, ... files, ... blocks" on laptop screen at boot, however that solution’s not proving to be the most effective, unfortunately… I tried installing the nvidia-beta package from AUR in the hopes that might assist, but that didn’t quite work out either. I tried running nvidia-xconfig in the hopes that generating a basic config would help, but unfortunately that didn’t prove effective either.