If you're mentioning dabbling with "grub", which may be hard since solus does not use a "common" grub setup:
Did you add any files or change anything in /etc/kernel/cmdline.d/ ?
Did you change anything in /usr/lib/kernel?
Did you create a /boot/grub2/grub.cfg or similar?
If you're just having issues with X11, what's your /var/log/Xorg.0.log?