LG C2 Enable 120hz (Nvidia) on login

gistfile1.txt

# 1. Install nvidia-settings
    $ pacman -Syu nvidia-settings
# 2. Run nvidia-settings
    $ nvidia-settings
# 3. Set the correct refresh-rate in nvidia-settings (e.g. 120hz)
    # X Server Display Configuration -> Set refresh-rate to desired, and Apply
# 4. Set the correct refresh-rate in Gnome
    # Settings -> Display -> Set refresh-rate to match previous step
# 5. Verify Gnome's monitors settings are correct
    $ code  ~/.config/monitors.xml
    
# e.g.
<monitors version="2">
  <configuration>
    <logicalmonitor>
      <x>0</x>
      <y>0</y>
      <scale>1</scale>
      <primary>yes</primary>
      <monitor>
        <monitorspec>
          <connector>HDMI-0</connector>
          <vendor>GSM</vendor>
          <product>LG TV SSCR2</product>
          <serial>0x01010101</serial>
        </monitorspec>
        <mode>
          <width>3840</width>
          <height>2160</height>
          <rate>119.87979888916016</rate>
        </mode>
      </monitor>
    </logicalmonitor>
  </configuration>
</monitors>

# 6. Copy monitors.xml to gdm's config directory
    $ cp ~/.config/monitors.xml /var/lib/gdm/.config/
# 7. Update the file's owner
    $ chown gdm:gdm /var/lib/gdm/.config/monitors.xml