[CentOS] How to disable i915 module

I am setting up CentOS 7 on my new firewall.  This will run as a head-
less system, accessed via a serial console when necessary.  It's only a
2GB system, so I don't see any reason to have the GPU consuming any of
the RAM.

I've blacklisted the i915, drm, and drm_kms_helper modules and rebuilt
the initramfs, but the i915 module is still being loaded.

Anyone know what might be loading the module and how I can stop it?

TIA!

-- 
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Ian Pilcher                                         arequipeno at gmail.com
-------- "I grew up before Mark Zuckerberg invented friendship" --------
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