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How to clean up Debian after upgrades ​

Vacuuming system logs

sh
sudo journalctl --vacuum-size=300M

Clean apt cache

sh
sudo apt-get clean

Rotate logs

sh
sudo logrotate /etc/logrotate.conf

How to adjust power settings ​

if value is suspend it will suspend when idle

sh
gsettings get org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type

adjust it

sh
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type 'nothing'

similar setting for battery

sh
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-battery-type 'nothing'

Fix buzzing sound ​

Check

cat /sys/module/snd_hda_intel/parameters/power_save

if larger than 0 it means the audio card goes to sleep and then speaker can buzzzz

sudoedit /sys/module/snd_hda_intel/parameters/power_save

and set to 0

Make it permanent

create new file

sh
sudo vim /etc/modprobe.d/audio_disable_powersave.conf

content:

sh
options snd_hda_intel power_save=0