How to set NoAccel to disable i915 GPU from Xorg.conf (to avoid GPU hang)

I'm running Ubuntu on a new system with a GPU that uses the i915 kernel module. Unfortunately several times a week the gui crashes and dumps me to a terminal. journalctl shows the problem is:

I'm working on diagnosing the problem, but that's not my question today. Today I simply want to disable Xorg from using the GPU at all, so I can use Xorg without crashing. (I tried kernel parameter nomodeset which indeed disabled the GPU but then I couldn't even dim the screen backlight, so that's too extreme of a method for me. This is why I'm now looking at the Xorg layer.)

I read from the ArchLinux wiki that sometimes GPU hanging can be solved by setting Option "NoAccel" "True" in Xorg.conf. That's what I want to try.

There's some missing explanation, however. I think I should add this by creating a file under /etc/X11/xorg.conf.d/90-noaccel.conf. man xorg.conf explains that xorg.conf is organized into sections. What section should NoAccel go in? Maybe it should go in the Device section, but does that mean I have to put other lines in the same section to identify the device? And how can I tell whether NoAccel is recognized successfully in Xorg?