[Nexus 6 Q&A, Help & Troubleshooting] Mahesha999:
After watching some videos and some googling, I realized that its not about the kernel actually which turns off cores but its hotplug mpdecision. I installed kernel audiutor and enabled all cores of my Nexus 6. Also I realized that max frequency of my active cores were something 1958 MHz. I just increase it to max 2649 MHz and rebooted. My Nexus 6 is going super smooth now. Also ran geekbench4 benchmarks.

These are the benchmarks.

Before changing CPU stuff

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Benchmarks 1

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Single core: 593

Multicore: 997

After changing CPU stuff

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Benchmarks 2

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Single core: 818

Multicore: 1009

Benchmarks 3

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Single core: 1069

Multicore: 3029

I feel that two cores were still offline during benchmark 2. When I checked after benchmark 2, they were off in kernel adiutor CPU monitor. I re-enabled them and I reran the geekbench. I ended up getting benchmark-3 which are quite good and in fact above average for Nexus 6. For 5-10 minutes now, all cores are active.

I then googled and realized that mpdecision restarts after every reboot. So I have to disable mpdecision on every reboot to enable all cores. Initially I was not getting meaning of two ON/OFF switches on kernel adiutor's interface. They were "Apply on boot" and "mpdecision". Now I have "Apply on boot" switched ON and "mpdecision" switched off. That means on every reboot, all my cores will be up at full frequency right?

Also that means more power consumption. So I have done certain things to compensate. Enabled dark mode so that Nexus's quad HD AMOLED will consume less power. Also installed Franco kernel's Servicely app which allows app and services to put on sleep when screen is off. I am also planning to use Nexis 6's always in battery saver mode. I am ok as long as it performs fast (with two core off, battery saver mode was useless, now it seems like very normal). Its just that only top and bottom orange bars/strips in battery saver mode annoys me.

One more thing I will love to have to save battery. In MIUI, there is per app setting for what to allow when app is in background as can be seen here: http://nine-faq.9folders.com/articl...-background-restriction-on-the-xiaomi-devices On my poco f1, I keep almost all apps "No background activity mode". Only handful have "No restriction". This is letting me extend battery to days straight. Is similar possible on lineageOS say through some apps or setting.

Also do you feel my config all fine? Latest lineageOS + All cores running at full speed + Power saving settings explained above? Is this perfect for performance and battery life? Should I disable encryption for further performance?

(Will be testing battery life soon for few days.)

(Just to add things implicit to me: I wont be installing any social media app on this, I keep data and location off always. I will be using Nexus 6 mostly for reading in chrome, pdf, word and youtube.)