Debian Linux Nvidia installation notes for t570 laptop

notes.txt

Using this guide, here are my notes in that regard:
===================================================
https://wiki.debian.org/NvidiaGraphicsDrivers/Optimus

lspci | grep 3D
02:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev a2)

My bios does not have the ability to disable the intel driver.

I installed x11-xserver-utils

The rest of this guide I have done before has resulted in my system not being able
to start x windows.  So the remaining portions were skipped.





Another guide I consulted was this one
======================================
https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_T570

I updated my bios to the latest firmware as mentioned in the guide.

I modified my kernel boot parameters in GRUB so that pcie_port_pm=off



The core guide I used was this one
==================================
https://wiki.debian.org/Bumblebee

For this one, I can do it from start to finish and still have X windows working.  I can even get some partial results
with nvidia.  I'll explain more about my current results at the end.

Of the three options for installing bumblebee, 
I chose to install bumblebee-nvidia and primus using this syntax
sudo apt-get install -t wheezy-backports bumblebee-nvidia primus

I added x11 userid to the bumblebee group using the method shown.  I verified I am in the
bumblebee group by using the groups command.

The guide mentions using optirun glxgears.  If I do this, I only get 60 fps.  
If I do lsmod, I will not see the nvidia driver loaded.  If I do this

$ optirun -b none nvidia-settings -c :8

the nvidia driver is detected and while its running, the nvidia driver is shown
in the lsmod output.  once I quit nvidia-settings it will unload the driver.

In the list of common errors it mentions
--
If optirun returns the following error (756522):  
[ERROR]Cannot access secondary GPU - error: [XORG] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
--

If I cat my /var/log/Xorg.8.log I do see this error.  The solution in the guide is to add a section to /etc/bumblebee/xorg.conf.nvidia
I added this section to that config file but afterwards I still get that error when I boot.


On irc someone suggested I create a directory and file.

I did this 
mkdir /etc/X11/xord.conf.d
cat 10-use-intel.conf
Section "Device"
	Identifier "Intel IGP"
	#Driver "intel"
	Driver "modesetting"
	Option "DRI" "3"
EndSection