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Disable CRTCs

Kai-Heng Feng requested to merge khfeng/mutter:disable-crtcs into master

After last monitor gets unplugged from the system, hotplug detection may no longer work on Intel GFX.

This is because we didn't trigger a modeset to disable CRTCs, and i915 requires it to make hotplug detection continue to work [1].

So ensure we disable CRTCs to solve the issue.

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