XPS 15 9570: More DPC latency improvements inbound
So, while Dell now seems content on blaming its customers if their XPS 15 9570 gets hot and drains its battery when asleep, the company has not forgotten about those pesky DPC latency issues. DPC, or Deferred Procedure Call, allows drivers to execute tasks and helps the system process them based on their importance. Poorly written or buggy drivers eat up resources by making numerous DPC instructions, which makes it difficult for the system to prioritise important tasks. In practical terms, this can cause audio stutters and glitches when playing music.
The main culprit of these high latency spikes is ACPI.sys, which Dell first announced that it was working to address almost eight months ago. The company had hoped that the release of BIOS 1.10.1 would resolve any DPC latency issues, but it only managed to reduce the frequency and intensity of these latency spikes.
We're definitely committed to improving the experience even more beyond the updates we made to the latest BIOS.