Introduction

Recently I bought a new monitor made by ViewSonic, but I meet some problems of the dual GPUs.

In the past years, I have used only one screen which is installed in my laptop without NVIDIA graphcial drivers. (Only use the Intel core GPU).

However, because of the new monitor added, the ntegrated graphics is not powerful enough to output two screens.

Therefore, I decide to install the NVIDIA grapcial driver of the RTX3050 on my Arch Linux in order to make use of the Discrete Graphics Card to output the new screen.

But things are not running well…

The reason why I crashed the wall is that I used to running Gnome on wayland mode before.

But it is said that NVIDIA drivers are not performing well on wayland?

So it truly means that I have to abandon the idea to output two screen on wayland.

Oh it’s bad! I have to come back to the hugging of the X11!

Beginning

At the beginning of that, I plugged the miniDP into the laptop and the another port into the monitor.

But disappointingly, it can’t be lighted up at all. QAQ.

Maybe the miniDP port can not output anything because of missing the NVIDIA driver.

So I have to install it.

Installation of the NVIDIA drivers

The first step is to install the drivers. Yeah notefuly, it’s the first step, not the last.

1

$ sudo pacman -S nvidia nvidia-utils lib32-nvidia-utils nvidia-prime

However, the screen was still not displaying anything…

Then I went to the Arch Linux CN group to ask the guys in community.

After discussion, I finally got the solution.

Open the ibt

About on the March, I faced a problem of VirutalBox and set the ibt=off.

But now it is not required to be off, I need to remove the param of the kernel.

Edit the file: /etc/default/grub,

1

$ sudo vim /etc/default/grub

1
2
3
4
5
6

GRUB_DEFAULT="0"
GRUB_TIMEOUT="100"
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash loglevel=3 rd.udev.log_priority=3 vt.global_cursor_default=0"
GRUB_CMDLINE_LINUX="ibt=off"
.........

then remove the ibt=off in GRUB_CMD_LINE_LINUX:

1
2
3
4
5
6

GRUB_DEFAULT="0"
GRUB_TIMEOUT="100"
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash loglevel=3 rd.udev.log_priority=3 vt.global_cursor_default=0"
GRUB_CMDLINE_LINUX=""
.........

Then regenerate the grub.cfg:

1

$ sudo grub-mkconfig -o /etc/grub/grub.cfg

Set NVIDIA modeset

Then I need to check the value of the nvidia-drm.modeset.

1

$ cat /sys/module/nvidia_drm/parameters/modeset

It shows:

Now I need to add nvidia-drm.modeset=1 into Kernel Paramaters.

Edit the file: /etc/default/grub

1

$ sudo vim /etc/default/grub

Add the nvidia-drm.modeset=1 into GRUB_CMDLINE_LINUX_DEFAULT

1
2
3

........
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash loglevel=3 rd.udev.log_priority=3 vt.global_cursor_default=0 nvidia-drm.modeset=1"
........

Then regenerate the grub configuration file.

1

$ sudo grub-mkconfig -o /boot/grub/grub.cfg

And reboot.

Use mutter-performance

Still, it’s not performing well after restarting the system.

For this reason, it should be a bit better to use the mutter-performance.

This package should be installed from AUR

1

$ paru -S mutter-performance

After installation, the desktop truly ran a little faster, but it’s still not enough.

And by the way, it’s time to remove the xf86-video-intel. It is not required in new devices.

1

$ sudo pacman -Rs xf86-video-intel

1

sudo pacman -R xf86-video-intel

Set X-11 Configuration

According to the Arch Wiki, I need to set some X-11 Configuration, intending to use the NVIDIA graphics only.

Write in the file /etc/X11/xorg.conf.d/10-nvidia-drm-outputclass.conf/:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15

Section "OutputClass"
    Identifier "intel"
    MatchDriver "i915"
    Driver "modesetting"
EndSection

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

Then I need to create two *.desktop files to configure the GDM.

Write in /usr/share/gdm/greeter/autostart/optimus.desktop and /etc/xdg/autostart/optimus.desktop

1
2
3
4
5
6

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

Finally, I rebooted and fixed the problem.

Yay!

References

• Phind.com
• NVIDIA Optimus - ArchWiki #Use_NVIDIA_graphics_only
• NVIDIA Optimus - ArchWiki #GDM