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Update

NVIDA has released their graphics modules to the Open Source Community. See NVIDIA's Open-Source GPU Drivers

That tool will write a xorg.conf file that can then be modified by hand. Unfortunately, because of the propietary driver the auto-detection in X.Org will attempt to install the nv driver, which is worse than the nouveau driver, and the nouveau driver provides no 3D acceleration.

I realize the OP wants to run X.Org in the fbdev device. The reason I answered this post the way I did (advising the OP to use either the NVIDIA proprietary or nouveau driver) is because the NVIDIA devs refuse to create code that allows their Graphics Cards to "attach" to the fbdev or fbcon kernel drivers, as evidenced by the answer directly from a Developer all the way back in 2016. Note that the version of the driver is s moot pint here, because as I stated in my comments below:

This was backed up by birdie's answer. The user community has been complaining abot this issue long before that post, and has asked multiple times that NVIDIA release an open-source driver that the community can refine, but seeing as NVIDIA is a for profit company, I don't see that happening anytime soon.

That tool will write a xorg.conf file that can then be modified by hand. Unfortunately, because of the proprietary driver the auto-detection in X.Org will attempt to install the nv driver, which is worse than the nouveau driver, and the nouveau driver provides no 3D acceleration.

I realize the OP wants to run X.Org in the fbdev device. The reason I answered this post the way I did (advising the OP to use either the NVIDIA proprietary or nouveau driver) is because the NVIDIA devs refuse to create code that allows their Graphics Cards to "attach" to the fbdev or fbcon kernel drivers, as evidenced by the answer directly from a Developer all the way back in 2016. Note that the version of the driver is a moot pint here, because as I stated in my comments below:

This was backed up by birdie's answer. The user community has been complaining about this issue long before that post, and has asked multiple times that NVIDIA release an open-source driver that the community can refine, but seeing as NVIDIA is a for profit company, I don't see that happening anytime soon.

Adding this Based on Comments Below

I realize the OP wants to run X.Org in the fbdev device. The reason I answered this post the way I did (advising the OP to use either the NVIDIA proprietary or nouveau driver) is because the NVIDIA devs refuse to create code that allows their Graphics Cards to "attach" to the fbdev or fbcon kernel drivers, as evidenced by the answer directly from a Developer all the way back in 2016. Note that the version of the driver is s moot pint here, because as I stated in my comments below:

With the advent of UEFI, the ability to use the uvesa kernel module and pass vga=xxx on the kernel command line flew out the window.

This was backed up by birdie's answer. The user community has been complaining abot this issue long before that post, and has asked multiple times that NVIDIA release an open-source driver that the community can refine, but seeing as NVIDIA is a for profit company, I don't see that happening anytime soon.