Linux MX25 LightDM Nvidia Issue - Google Search
To fix LightDM on your cloned MX 25 Linux (Xfce) system, the most common issue is a stale Xorg configuration or a driver mismatch between the original NVIDIA GPU and the new NVIDIA iGPU.
1. Remove Stale Xorg Configuration [1]
Cloning often carries over a /etc/X11/xorg.conf file hardcoded for the old GPU. This is the primary reason for a black screen or LightDM failing to start. [2, 3]
- At the black screen, press Ctrl + Alt + F1 to enter the TTY console.
- Log in with your username and password.
- Rename or delete the old configuration file:
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.bak - Check for any NVIDIA-specific snippets that might interfere:
sudo rm /etc/X11/xorg.conf.d/20-nvidia.conf(if it exists) - Reboot:
sudo reboot. [2, 4, 5, 6]
2. Reinstall Drivers for the New Hardware [7]
If removing the config doesn't work, the driver version from the previous system might not be fully compatible with the iGPU.
- From the TTY (Ctrl + Alt + F1), use MX Linux's dedicated tool to purge the current drivers:
sudo ddm-mx -p nvidia - Reboot your system. It should now boot using the open-source Nouveau driver, allowing you to reach the desktop.
- Once on the desktop, open the MX Nvidia Driver Installer from the menu to detect and install the correct driver for your current NVIDIA iGPU. [2, 8, 9, 10]
3. Clear Stale User Configurations
Sometimes user-specific display settings from the previous hardware cause Xfce to fail upon login. [11]
- In the TTY or terminal, run:
rm ~/.config/xfce4/xfconf/xfce-perchannel-xml/displays.xml
rm ~/.Xauthority[11]
4. Advanced: Force Early Driver Loading
If you still see a black screen, ensure the kernel loads the NVIDIA modules early enough for LightDM. [12]
- Create or edit the file:
sudo nano /etc/modules-load.d/nvidia-drm.conf. - Add this line:
nvidia-drm. - Save and exit (Ctrl+O, Enter, Ctrl+X) and reboot. [13, 14]
Would you like the specific terminal commands to check your current GPU model and verify which driver is currently active?