Hello,

We have a DPC-Latency-type issue with 5379  (8gen i7) notebooks.

It seems that Intel's Turbo Boost CPU operation causes audio crackling/glitchy noises on every audio output, that makes it impossible to enjoy audio playback. This issue is present by all power profile, but if We set the "Maximum processor state" value to 99% in the Power Options (this probably turn off Intel's Turbo Boost technology.), the DPC-Latency monitor shows better values and the audio playback becomes continuous. However, this trick is not a good solution because it significantly drops the machine's performance.

The latest BIOS and all the latest drivers are installed by the Dell updater tool.

Methods we have tried:

Clean Boot,
Clean Windows 10 Home install by embedded BIOS recovery.
Clean Windows 10 Home/Pro installation by stock MSDN image.
Clean installation using official Dell drivers. 
Clean installation using drivers provided by Windows Update.
Clean installation using Intel factory + Windows drivers.

We've already tried to replace the motherboard on one of these machines (by Official Dell service) which did not improve our latency issues.

Screenshots of DPC latency checker:

Screenshot of LatencyMon:

I will insert the log of LatencyMon into the following post

Each of our notebooks has the same configuration as this one identified by the following Service Tag and the issue occurs on each machine.

Service Tag:

We do not know what the next step is. Since this error occurs on multiple 5379 machines, we guess it is a driver problem that is related to the power management.