Plasma/Wayland/Nvidia: Difference between revisions

From KDE Community Wiki
(Restore a limitation, I was wrong when I removed it)
(Update to make relevant for Plasma 6 and explicit sync times)
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To use the Plasma Wayland session:
To use the Plasma Wayland session:


* Ensure that you are using Plasma 5.20.2 or later — preferably the latest stable release.
* Use an up-to-date version of Plasma (explicit sync support was implemented in 6.1)
* Ensure the NVIDIA driver is not older than version 495.44 — KWin is no longer compatible with previous versions.
* Ensure a reasonably new NVIDIA driver:
* You need an up-to-date Qt. Make sure you have >= Qt5.15.0 or [https://code.qt.io/cgit/qt/qtwayland.git/commit/?id=4bd13402f0293e85b8dfdf92254e250ac28094c7 4bd13402f0293e85b8dfdf92254e250ac28094c7] cherry-picked.
** minimum supported by KWin is 495.44;
* Make sure to have the Nvidia EGL library installed. For example on Ubuntu and Neon the relevant package is called <code>libnvidia-egl-wayland1</code>
** XWayland apps are usable with 555 and newer.
 
* You need to have the Nvidia EGL library installed. It can be a separate package (<code>libnvidia-egl-wayland1</code>) or bundled with the driver package (e.g. `nvidia-gl-G06` on openSUSE since 555).
To use the Plasma Wayland session with hardware acceleration on XWayland apps, you need:
* To run XWayland apps without flickering, at least XWayland 24.1 is required.
 
* Xorg 1.20.12 or later.
* XWayland 21.1.2 or later.
* libxcb 1.1.7 or later.


=== Use the modesetting driver===
=== Use the modesetting driver===
Check our driver is running in modesettings mode:
Check whether the driver is running in modesetting mode:


<code>cat /sys/module/nvidia_drm/parameters/modeset</code>
<code>cat /sys/module/nvidia_drm/parameters/modeset</code>


It should print "Y". If not, modify your kernel command line and add the line <code>nvidia_drm.modeset=1</code>.
It should print “Y”. If not, modify your kernel command line and add the line <code>nvidia_drm.modeset=1</code>.
Search for "kernel parameters" in your distribution; https://wiki.archlinux.org/index.php/Kernel_parameters is a good starting point.
Search for “kernel parameters” in your distribution; https://wiki.archlinux.org/index.php/Kernel_parameters is a good starting point.


It is also possible to pass the parameter via module configuration:
It is also possible to pass the parameter via module configuration:
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=== Login ===
=== Login ===
* Select "Plasma (wayland)" from your login manager
* Select “Plasma (Wayland)from your login manager
* Enjoy your beautiful super-fast accelerated wayland desktop!
* Enjoy your beautiful super-fast accelerated Wayland desktop!


=== Known Limitations ===
=== Known Limitations ===
* Night Color is not applied to the mouse cursor: https://bugs.kde.org/show_bug.cgi?id=479889
* Night Color is not applied to the mouse cursor: https://bugs.kde.org/show_bug.cgi?id=479889
* Poor performance on external screens on hybrid GPU setups when using NVIDIA GPU as a secondary GPU because it requires CPU copying from the primary GPU to the secondary GPU (see https://invent.kde.org/plasma/kwin/-/merge_requests/1031, https://bugs.kde.org/show_bug.cgi?id=452219)
* Poor performance on external screens on hybrid GPU setups when using NVIDIA GPU as a secondary GPU because it requires CPU copying from the primary GPU to the secondary GPU (see https://invent.kde.org/plasma/kwin/-/merge_requests/1031, https://bugs.kde.org/show_bug.cgi?id=452219)

Revision as of 15:06, 28 September 2024

Here's how to run with the proprietary Nvidia driver on Wayland:

Prerequisites

To use the Plasma Wayland session:

  • Use an up-to-date version of Plasma (explicit sync support was implemented in 6.1)
  • Ensure a reasonably new NVIDIA driver:
    • minimum supported by KWin is 495.44;
    • XWayland apps are usable with 555 and newer.
  • You need to have the Nvidia EGL library installed. It can be a separate package (libnvidia-egl-wayland1) or bundled with the driver package (e.g. `nvidia-gl-G06` on openSUSE since 555).
  • To run XWayland apps without flickering, at least XWayland 24.1 is required.

Use the modesetting driver

Check whether the driver is running in modesetting mode:

cat /sys/module/nvidia_drm/parameters/modeset

It should print “Y”. If not, modify your kernel command line and add the line nvidia_drm.modeset=1. Search for “kernel parameters” in your distribution; https://wiki.archlinux.org/index.php/Kernel_parameters is a good starting point.

It is also possible to pass the parameter via module configuration:

echo options nvidia_drm modeset=1 | sudo tee /etc/modprobe.d/nvidia_drm.conf

You need to regenerate the initramfs in case your distribution provides the graphics drivers in initramfs (e.g. sudo update-initramfs -u)

Login

  • Select “Plasma (Wayland)” from your login manager
  • Enjoy your beautiful super-fast accelerated Wayland desktop!

Known Limitations