Dear Maintainer, thermald.service is the only place where options such as --poll-interval can be set, so this file should be considered a package conffile. Because thermald.service is not a conffile, local changes to the command line are silently lost on upgrade. Kind regards, Ben.
Workaround is to copy thermald.service to (for example) thermald-custom.service and apply local customisations, stop+disable+mask thermald.service, and enable+start thermald-custom.service. Kind regards,
systemd includes an extensive override mechanism so this should not be needed and I think this bug can be closed. You can start it like this: systemctl edit thermald.service Then remove all the lines that you don't want to override, but keep the section headers intact.