Grub2 verbose booting Nixos 25.11 with custom kernel based upon 7.1.0-rc4 progressed to lightdm login and Mate desktop.
Grub2 verbose booting NIxos 26.05 with custom kernel 7.1.0-rc4 reaches lightdm login but does not progress to Mate desktop.
Grub2 verbose booting Nixos 26.05 with default 7.0.10 kernel reaches lightdm login and progresses to Mate desktop.
Noted difference in verbose screen output for custom kernel and default kernel as follows:
Default kernel 7.0.10 scrolling boot output shows “login manager” and “graphical interface” before progressing to the lightdm login window. The lightdm window displays the theme characteristics specified in /etc/nixos/configuration.nix.
Custom kernel 7.1.0-rc4 scrolling boot output shows “login manager” but not “graphical interface” before progressing to the lightdm login window. The lightdm login window does not display the theme characteristics configured in /etc/nixos/configuration.nix.
It appears there has been a change in the way the 26.05 default kernel is initializing the desktop which may involve enabling a kernel flag or kernel flags for the custom kernel that are present in the Nixos default 7.0.10 kernel.
Can anyone give me specific information regarding any changes from 25.11 to 26.05 relating to how the kernel initializes the desktop and any specific kernel flags that need to be enabled or disabled due to the 26.05 release?