I am currently experiencing lot's of static and "thunks" on and off regarding audio on my Dell E7450 Laptop's line out. I've tried different speakers and headsets, with the same issue. If I mute the audio, the hissing and intermittent "Thunk" also stop.
I've tried disabling power management, with no luck:
# cat /sys/module/snd_hda_intel/parameters/power_save
I'll attach the output of alsa_info and lspci.
Created attachment 276151 [details]
alsa-info from Dell E7450
Created attachment 276153 [details]
Dell 7450 lspci -v -n Output
Created attachment 276277 [details]
Alsa info from another e7470
I have similar issue to Jason here. Similar product line hw here Lattitude E7470.
cat /sys/module/snd_hda_intel/parameters/power_save reports 0 by default on my fedora 27 system.
I will update with another lspci report.
Created attachment 276279 [details]
lspci output e7470