I’m using sunshine for remote gaming on my Linux PC. Because I use Wayland and don’t have an Nvidia I use kmsgrab for capture (under the hood sunshine uses ffmpeg).

I have noticed that I can enter tty and kmsgrab will capture it as well. If it just captured after logging in my user I wouldn’t be surprised, but it also captures the login screen.

I autostart it at login using my systemd user configuration (not systemwide) so it should just have my user’s permission level. I get the same results if I put it in KDE’s autostart section, so it’s not a systemd thing.

Why does that work? Shouldn’t you need special privileges to capture everything?

The installation instructions tells you to do sudo setcap -r $(readlink -f $(which sunshine)) is this the reason why it works? What does the command do exactly?