How to resolve run-of-the-mill
... connection problems
# Check connection
ping 8.8.8.8
# Check domain resolver
ping google.com
# If pinging 8.8.8.8 works but pinging google.com doesn't, check dns file resolver
# Add a new line:
# nameserver 8.8.8.8
sudo nano /etc/resolv.conf
# Check wired connections
sudo service networking
Prevent /etc/resolv.conf from updating
By default, NetworkManager dynamically updates the /etc/resolv.conf
file with the DNS settings from active NetworkManager connection profiles. However, you can disable this behavior and manually configure DNS settings in /etc/resolv.conf
. Steps:
1. As the root user, create the /etc/NetworkManager/conf.d/90-dns-none.conf
file with the following content by using a text editor:
2. Reload the NetworkManager service:
After you reload the service, NetworkManager no longer updates the /etc/resolv.conf
file. However, the last contents of the file are preserved.
3. Optionally, remove the "Generated by NetworkManager" comment from /etc/resolv.conf to avoid confusion.
Verification
1. Edit the /etc/resolv.conf file and manually update the configuration.
2. Reload the NetworkManager service:
cat /etc/resolv.conf If you successfully disabled DNS processing, NetworkManager did not override the manually configured settings.
## ...issues with screen monitors
Xrandr is used to set the size, orientation and/or reflection of the outputs for a screen. It can also set the screen size.
See commands and usage
man xrandr
List current settings
xrandr
Also, for listing current settings
xrandr --current
Listing current settings helps you out to see the name of the outputs of your screens.
In my case:
```shell-session
# Place laptop to the left of DP-2 (27'')
xrandr --output eDP-1 --left-of DP-2
# Place 34'' to the right of DP-2 (27'')
xrandr --output HDMI-1 --right-of DP-2
# Rotate 27''
xrandr --output DP-2 --rotate left
... issues with monitor recognized but not displayed
Weird key sequence:
Ctrl-Alt-F3, Ctrl-Alt-F7
Last update: 2023-05-02 Created: May 2, 2023 17:36:07