The early LSM modules are initialized unconditionally before parsing kernel cmdline. If you have CONFIG_SECURITY_LOCKDOWN_LSM_EARLY=y config ( zgrep LOCKDOWN /proc/config.gz) then you need to try out with another kernel or change your kernel config to disable it and rebuild. Just remember to put those back on when done with testing. Easiest way to disable those is by adding lsm= security= ( docs and lockdown enabling logic) settings to your kernel cmdline. Update – BIOS 1.10.Ioperm is also disabled by AppArmor default settings and lockdown (search ioperm to find relevant parts in both man pages).Update – Intel Management Engine Components installer ( or later).Update – Intel Dynamic Platform and Thermal Framework ( or later).Update – Intel Chipset Device Software ( or later).Download link for Dell Driver & BIOS Updates. Update Chipset Drivers and BIOS to the latest available, disable Turbo Boost and SpeedStep in the BIOS. The Fix – Steps recommended by Dell technical support. If this happens repeatedly and for long periods of time you’re not only loosing performance, it may also be damaging your system. A restart will fix the issue – but the issue will return. This can happen randomly and may persist hours or days until you restart. You will be able to feel the heat on the bottom exhaust grille, careful it’s HOT. Depending on your environment you may not be able to hear the fan noise until up close (it’s a laptop fan, not a Mac Pro monster desktop that could power a small village…). This makes your laptop hot and when it gets hot the fan kicks on, and stays on full speed to cool your now glowing hot CPU. The Issue – Your laptop’s Intel CPU is being instructed to run at maximum speed for no reason. Sure you have your base apps open, and the normal 12 28 tabs in your favorite browser ( Vivaldi) but you’re not rendering any video files or running a Bitcoin mining operation. Is your brand new or nearly new Dell Latitude 7400 laptop hot with the fan continuously running fast and loud for no apparent reason? When you check Task Manager CPU utilization isn’t high as might be expected – no runaway processes that need to be killed, no apps killing the CPU with high demand.

Dell bios fan control