Hybrid-Graphics-Setup

Saikat Karmakar | Jan 9 : 2021

If you're trying to connect to external monitors using HDMI and you have a hybrid setup like me (AMD Radeon vega + nvidia 1650) then these configuration files may help you as it worked for me.
Just copy these .conf files to /usr/share/X11/xorg.conf.d

Automatic

Caution: This script is not tested run this at your own risk

git clone https://github.com/Aviksaikat/Hybrid-Graphics-Setup
cd Hybrid-Graphics-Setup
chmod +x config.sh
sudo ./config.sh

Manual steps

sudo (text_editor) /usr/share/X11/xorg.conf.d/10-amdgpu.conf

Section "OutputClass"
  Identifier "AMDgpu"
  MatchDriver "amdgpu"
  Driver "modesetting"
EndSection

sudo (text_editor) /usr/share/X11/xorg.conf.d/10-nvidia-drm-outputclass.conf

Section "OutputClass"
    Identifier "nvidia"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    Option "AllowEmptyInitialConfiguration"
    ModulePath "/usr/lib/nvidia/xorg"
    ModulePath "/usr/lib/xorg/modules"
    Option "PrimaryGPU" "Yes"
EndSection

Make sure no other config files named interfere 10-nvidia-drm-outputclass.conf & 10-amdgpu.conf (in /etc/X11 or /usr/share/X11).

Finally

Display managers (choose yours):

LightDM

create /etc/lightdm/display_setup.sh

#!/bin/sh
xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto

Make the script executable:

chmod +x /etc/lightdm/display_setup.sh

Now configure lightdm to run the script by editing the [Seat:*] section in /etc/lightdm/lightdm.conf :

/etc/lightdm/lightdm.conf

[Seat:*] display-setup-script=/etc/lightdm/display_setup.sh

Now reboot and your display manager should start. If your display dpi is not correct add the following line (applies also to the other display managers):

xrandr --dpi 96

SDDM

/usr/share/sddm/scripts/Xsetup

xrandr --setprovideroutputsource modesetting NVIDIA-0; xrandr --auto

GDM

/usr/share/gdm/greeter/autostart/optimus.desktop /etc/xdg/autostart/optimus.desktop

[Desktop Entry]
Type=Application
Name=Optimus
Exec=sh -c "xrandr --setprovideroutputsource modesetting NVIDIA-0; xrandr --auto"
NoDisplay=true
X-GNOME-Autostart-Phase=DisplayServer

Make sure that GDM use X as default backend.

Enable prime synchronisation

edit or create: /etc/modprobe.d/nvidia.conf:

add:

options nvidia-drm modeset=1

Blacklist nouveau:

sudo bash -c "echo blacklist nouveau > /etc/modprobe.d/blacklist-nvidia-nouveau.conf"
sudo bash -c "echo options nouveau modeset=0 >> /etc/modprobe.d/blacklist-nvidia-nouveau.conf"

Update initramfs:

sudo update-initramfs -u -k all

Reboot.
This was the original ticket I opened and the nvidia support super actively helped me thanks to them I can work on my new monitor. https://forums.developer.nvidia.com/t/having-problem-while-using-external-monitor-on-parrot-os/199476/18

YourFriendCaspian / Hybrid-Graphics-Setup