- Bring default RHEL 6 X.org configuration on par with Fedora/RHEL 7+ and make sure it is installed by default.
- Install RHEL 6 X.org configuration template only on RHEL 6, make sure it does not end in .conf to avoid confusion.
- Simplify GRUB installation for Grub 1 (RHEL 6) and Grub 2 (RHEL 7+/Fedora), do not use obsolete kernel parameters.
- Do not regenerate all the Grub configuration the user might have, just add the required parameters.
- Add kernel parameters to default grub file on Fedora/RHEL 7+ just in case the user uses grub-mkconfig.
This also simplifies Grub configuration for other distributions and removes the "upgrade path" from Fedora 16 Grub 1.