Fan spin up on AC

[ghost]

Everything is working nicely on my XPS 15. Seeing power usage < 10 W when on battery.

On AC, deactivation of power save features causes cpu power consumption, and temperature to rise, which causes the fans to periodically spin up every 10-20 seconds, even under light load.

Is there a tweak to /etc/default/tlp that could solve this?

[ghost]

Perhaps I didn't set up tlp correctly, but anyway, you can force powersave mode when on AC to throttle CPU power consumption. No more periodic fan spin up on light loads now.

# Minimize number of used CPU cores/hyper-threads under light load conditions
SCHED_POWERSAVE_ON_AC=1
SCHED_POWERSAVE_ON_BAT=1

# Set CPU performance versus energy savings policy:
#   performance, normal, powersave
# Requires kernel module msr and x86_energy_perf_policy from linux-tools
ENERGY_PERF_POLICY_ON_AC=powersave
ENERGY_PERF_POLICY_ON_BAT=powersave