LENOVO T410 with Debian Buster and XFCE

1. modify /etc/apt/sources.list : add contrib and non-free
2. install intel wifi driver : firmware-iwlwifi
3. Install nvidia driver : install/run nvidia-detect, install nvidia-legacy-340xx-driver
4. Whenever I lock my screen, it goes full black and does not respond either to moving the cursor or pressing keys from the keyboard.

After searching for a while, I found the solution in the Arch Wiki.

The solution is pretty simple. Just create a text file named 20-intel.conf in the /etc/X11/xorg.conf.d/ directory path (you may have to create directory xorg.conf.d if it does not exist) and paste the following in it:

Section "Device"
        Identifier "Nvidia Card"
        Driver "nvidia"
        VendorName "NVIDIA Corporation"
        BoardName "NVS 3100M"
EndSection

Now save the file and reboot your Debian Xfce system.

Screen black problem after locking the screen in Xfce should be solved by now.

5. How to enable my keyboard's volume keys in XFCE?

1. Right click a panel -> Panel submenu -> Add New Items...
2. Add an instance of PulseAudio Plugin
3. Right click the icon that just appeared in your panel and click "Properties". Make sure "Enable keyboard shortcuts for volume control" is enabled.

You may have to install the PulseAudio Plugin first. In Debian and Debian-based distributions, the package is called xfce4-pulseaudio-plugin.