Bug#900248: nvidia-driver: update to 390.59 breaks direct rendering

[Dean Loros]

I can also confirm that: slab_common.usercopy_fallback=y   works for
4-16-2. I have:

/etc/nvidia/current/nvidia-drm-outputclass.conf
with this content:

Section "OutputClass"
    Identifier         "nvidia"
    MatchDriver    "nvidia-drm"
    Driver              "nvidia"
    ModulePath     "/usr/lib/xorg/modules/linux"
EndSection

 also set in my system.  I have looked at the nVidia bug report & it
"seems" that according to one user:

It seems to be fixed on 396.24.

[    1.040981] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  396.24
Thu Apr 26 00:10:09 PDT 2018 (using threaded interrupts)
[    1.041976] nvidia-modeset: Loading NVIDIA Kernel Mode Setting
Driver for UNIX platforms  396.24  Wed Apr 25 23:54:18 PDT 2018
[    1.049701] nvidia-uvm: Loaded the UVM driver in 8 mode, major
device number 243
[    1.050203] Linux agpgart interface v0.103
[    1.058829] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver

Kernel 4.16.8-1