Funtoo - How to repair XDM and NVIDIA

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Goal: After some updates it can happen that by example XDM or Nvidia will not work any more properly. It could be to not more booting properly after an kernel change. With this how to you will be able to repair most of update issues.

XDM

# emerge xdm

Configure

xdm is controlled by /etc/conf.d/xdm.

 # vim /etc/conf.d/xdm
 DISPLAYMANAGER="lightdm"

NOTE: xdm is in my case configured with a modern display managers. see: Lightdm

Init

# rc-update add xdm
# rc

Nvidia

WARNING: If you installed debian-sources with the binary USE flag you will need to blacklist the nouveau module:

# vim /etc/modrpobe.d/nouveau-blacklist.conf
blacklist nouveau
options nouveau modeset=0
alias nouveau off

Installation

# vim /etc/portage/make.conf
VIDEO_CARDS="nvidia"
# emerge x11-drivers/nvidia=drivers

When the installation is complete run modprobe nvidia modules to read the kernel memory.

lsmod | grep nvidia

If an update before remove the old module

 
# rmod nvidia 
# modrprobe nvidia

Configuring

 vim /etc/conf.d/modules
 modules="nvidia"

Integration with X server

# nvidia-xconfig

Enabling NVIDIA support

 # vim /etc/portage/make.conf
 USE="nvidia"

Enabling Opengl/Opencl

# eselect opengl set nvidia
# eselect opencl set nvidia

Troubleshooting

Xorg says it can't find any screens?

 
# /etc/init.d/xdm stop
$ startx 
nvidia-xconfig

From here it should work, if still not working try:

 # lspci | grep -i nvidia
 ---
 "01:00.0" VGA compatible controller: NVIDIA Corporation GP107 [GeForce GTX 1050 Ti] (rev a1) 
 ---
 # vim /etc/X11/xorg.conf
 ---
 Section "Device"
     Identifier     "Device0"
     Driver         "nvidia"
     VendorName     "NVIDIA Corporation"
 BusID          "PCI:1:0:0"
 EndSection
 ---

Now you can retry with your user a starx and your xorg should work fine.

Documentation

XDM:

NVIDIA: