Some desk configs
Fix for xinput in Xubuntu 18.04 (Bug):
$ sudo apt remove xserver-xorg-input-libinput && sudo apt install xserver-xorg-input-evdev
Displays setup
# Show all info
$ sudo xrandr
Displays configs examples
# Switch to Dual external displays
xrandr --output HDMI-3 --auto --mode 1920x1080 --primary
xrandr --output HDMI-2 --auto --mode 1280x1024 --right-of HDMI-3 --pos 1920x0
# Switch to Single external display
xrandr --output HDMI-3 --auto --mode 1920x1080 --primary
xrandr --output HDMI-2 --off
# Switch to Dual external displays
xrandr --output HDMI-1-1 --auto --mode 1920x1080 --primary
xrandr --output DP-1 --auto --mode 1280x1024 --right-of HDMI-1-1 --pos 1920x0
# Switch to Single external display
xrandr --output HDMI-1-1 --auto --mode 1920x1080 --primary
xrandr --output DP-1 --off
Bench NVME
In order to bypass the page cache, causing the reads to go directly from the drive into hdparm's buffers (ie "raw" I/O), you need to use the --direct parameter in hdparm. That is:
$ sudo hdparm -Tt --direct /dev/nvme0n1
That way your results will be lower but close the actual disk's performance.