POP_OS 24.04 Cosmic Desktop White Screen

[rb3rg]

The Problem: When I attempt to connect to my Pop!_OS machine using the NoMachine client, the screen turns completely white immediately after I log in.

Environment:

OS: Pop!_OS 24.04

NoMachine Version: 9.3.7

Desktop Environment: COSMIC (Default)

Display Server: Wayland (Default)

VGA controller:

• • Advanced Micro Devices, Inc. [AMD/ATI] Phoenix3 (rev c9)

• • DeviceName: Realtek

• • Subsystem: Hewlett-Packard Company Phoenix3

• • Kernel driver in use: amdgpu

Technical Findings

Server Logs: The logs contain the following error: WARNING! Failed to open display :1. (Full logs have been sent via email).

Current Workaround: If I switch the display manager to GDM3 and disable Wayland (Wayland=false), NoMachine works. However, this forces me to use KDE Plasma (X11) instead of the default desktop.

Goal: I want to use NoMachine to access the default COSMIC Desktop running on Wayland without having to switch to X11 or a different desktop environment.

[Britgirl]

Hi, our initial tests show that using the compositor or the EGL method does not work whilst the DRM screen capture method does. Please enable it by editing /usr/NX/etc/node.cfg and setting the WaylandModes key by removing the pre-pending # from the key name WaylandModes drm. You can also try to use GPU non-proprietary drivers. In some cases DRM can fail when AMD drivers are used.

[Author]

Posts