it is usually in :
/etc/NetworkManager/NetworkManager.conf
/etc/ncsd.conf
Look at these files: /etc/hosts /etc/NetworkManager/NetworkManager.conf /etc/ncsd.conf
Linux can run with virtually any hardware configuration, but it is best to check the system requirements for your Linux distro.
text file
Most Linux applications store files somewhere int he user's home directory, either in a folder of their own (such as .applicationname) or as a single configuration file. Deleting the configuration file should return the game to the default settings. Alternatively, you can try modifying the settings file and fixing the bad resolution manually.
System-wide configuration files are usually found in /etc. Personalized configuration files are stored in the user's home directory, in files and subdirectories preceded by a "." in their name.
/etc/nsswitch.conf
One common problem that is faced by Linux system administrators is not understanding permissions. Not backing up critical configuration files and not choosing good root passwords are other problems new Linux system administrators may face.
/etc/nswitch.conf
I'm pretty sure that it's ifconfig...
Unix / Linux are both file based operating systems. The majority of configuration can be amended by system configuration files, although as the systems have developed more and more of this is automated and hidden from the user. User configuration files will normally reside under the /etc directory.
in GUI network manager in CLI ifconfig