DELL's support: "Unfortunately, your computer is passed the 30 day return period."  
Hi, I've bought DELL Latitude 5491 recently and I've run into problems with VSTs (software virtual instrument). Audio singal has cracks, audio is dropping and glitcing when ACPI.SYS latency is high - and bet it goes as far as 1.6+ ms! The audio application itself consumes approximately 5% of CPU and its DMS/IRQ is quick. Why DELL did not fixed ACPI.SYS problem on their devices yet? I've found numerous discussions on the internet with a lot of complains on ACPI.SYS and Dell Laptops causing DELL laptops problematic for sound processing and proffesional audio. I've updated all the drivers with DELL official tools, I've power management set to Performance, all possible energy savings disabled. Reinstalled the machine. Can someone please give me a hint how to eventually solve that? I know this is minor issue for most users, but I'm really upset with this as I've spent money on "brand". regars -platypus
Dell laptop & ACPI.SYS high DPC latency problem (warning for DELL Latitude 
users working with low latency audio)