You should not need to enable the xf86(4) aperture driver, as you are not using isa(4) or pci(4) video cards. You are using the modesetting(4) driver in X with glamor 2D acceleration, via the inteldrm(4) kernel driver.
One option would be to attempt to use the older intel(4) driver in place of the default modesetting(4) driver.
You could create a temporary test configuration file in /etc/X11/xorg.conf.d/ with a simple test configuration fragment such as:
Code:
Section "Device"
Identifier "video"
Driver "intel"
EndSection
If this works, you may add additional options as defined in the intel(4) man page.