Hi, This is not a question or bugreport, just information for some people that might be unaware or wondering. With TLP 1.4 (from snapshot 20211210 or later) there are some new defaults: SOUND_POWER_SAVE_ON_AC=1 (was 0) [1] and RUNTIME_PM_DRIVER_DENYLIST="mei_me nouveau radeon" (was "amdgpu mei_me nouveau nvidia pcieport radeon") [2] for my laptop with nvidia optimus and binary proprietary driver these changes lead to 2 problems: 1. Even though NVidia dGPU runtime_status was suspended and there was a 0% in powertop, in reality it was always powered on — hardware LED, temperature. And I couldn't switch it off (I'm using Linux PM, not bbswitch). Not sure why tlp broke all power management of NVidia GPU, maybe will check it later. 2. Before each audio usage there was cracking sound and snd_hda_intel power_save was 1 even when AC is on. Documentation [3] says "Power saving mode may cause slight clicks" but for me they aren't slight but **very** audible and unpleasant. So restoring those values to 1.3 defaults (/etc/tlp.conf or /etc/tlp.d/) fixed things for me. [1] https://github.com/linrunner/TLP/issues/495 [2] https://github.com/linrunner/TLP/issues/488 [3] https://linrunner.de/tlp/settings/audio.html -- Kind regards, Mykola Krachkovsky -- Найкращі побажання, Микола Крачковський