Changing Night Light settings causes excessive CPU and disk activity
Changing the Manual Schedule of the Night Light can cause:
- GNOME Settings to become unresponsive,
- the CPU fan to spin up, and
- the disk drive activity light to turn on continuously.
The gnome-control-center process exhibits excessive CPU usage. The dconf-service process exhibits excessive disk activity (disk reads in GNOME 3.26.2, disk writes in GNOME 3.34.4).
Steps to reproduce:
- Open GNOME Settings
- Go to Settings > Devices > Displays > Night Light
- Turn Night Light On
- Change Schedule to Manual Schedule
- Change Times to From=12:00AM and To=12:00PM
- Click the To PM button to change the To time to 12:00AM
- Click the "-" button for the To minutes
The issue happens on a Lenovo ThinkPad T520 laptop with GNOME 3.34.4 / openSUSE Leap 15.2 Beta.
The issue happens on a desktop (single monitor) with GNOME 3.26.2 / openSUSE Leap 15.1.
To regain control, open a terminal and run:
gsettings set org.gnome.settings-daemon.plugins.color night-light-schedule-automatic true