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How to install nvidia-legacy-340xx-driver on Debian 12 Bookworm

This guide will show you how to download, compile and install the nvidia-legacy-340xx-driver on Debian 12. Some people install the driver directly from sid but this will mix packages from both stable and unstable which may create issues. It's recommended to update and upgrade your system before you start.

Step 1. Download the source code.

Install these packages.

sudo apt install build-essential fakeroot devscripts

You can manually download the source code from debian.org and go to Step 2 or continue with Step 1. Don't worry you won't be able to install packages from sid.
Add 'deb-src http://httpredir.debian.org/debian unstable main non-free contrib' to '/etc/apt/sources.list'.

Install Nvidia Geforce 710m Drivers on Optimus Laptop

Disable GPU Manager

GPU Manager will overwrite the X configuration at each reboot, so the first step is to disable it.

According to various posts it can be disabled adding nogpumanager to the boot options e.g. in GRUB. Edit /etc/default/grub and add nogpumanager to the GRUB_CMDLINE_LINUX option.

For example, if /etc/default/grub had

	import numpy as np
	import cv2
	import sys

	cap = cv2.VideoCapture(0)

	face_cascade = cv2.CascadeClassifier('<PATH_TO_CASCADES_FOLDER>/haarcascade_frontalface_default.xml')

	while(True):
	# Capture frame-by-frame