Ki-kernel for POCO F4 / Redmi K40S (munch)

Build Date: 2026-09-14
Kernel Version: Linux 4.19.325
Variant: MIUI & AOSP
Toolchain: Proton Clang 13.0.0 (LLVM LLD 2.36.1)

Backported Google BBRv3 to Linux 4.19 with DCTCP ECN helpers and extended BBR stats.
Limit TCP CC to bbr and westwood, with fq as default qdisc.
Tuned schedutil rate limits for Silver, Gold and Prime clusters.
Adjusted WALT migration thresholds.
Reworked touch-aware LPM to avoid unnecessary CPU wakeups during touch/scroll.
Reduced I/O-wait impact in menu governor.
Switched autosleep_wq to WQ_HIGHPRI | WQ_FREEZABLE.
Reduced suspend retry timeout from 500ms to 50ms.
Tuned RPMH suspend states.
Enabled high-priority per-CPU EROFS decompression kthreads.
Increased readahead from 128KB to 512KB.
Increased F2FS discard batching to 16 requests.
Fixed KernelSU-Next / SuSFS build and compatibility issues.
Raised QCA Bluetooth workqueue priority.
Increased BT UART autosuspend delay from 150ms to 1000ms.
Added Sound Control 3.x hardware gain controls.
Disabled USB LPM for USB Audio endpoints.
Added battery SOH and cycle count nodes.
Added writable charging current limit.
Enabled Smart FPS for 60/90/120Hz on Samsung E4.
Added switchable CPU profiles: Battery Saver / Balanced / Performance.
- Mode Battery : echo 0 > /sys/kernel/ki_profile/mode
- Mode Balanced: echo 1 > /sys/kernel/ki_profile/mode
- Mode Performance: echo 2 > /sys/kernel/ki_profile/mode
Fixed WALT capacity scaling and migration handling.
Built WireGuard into the kernel.
Improved SuSFS Stealth SU and supercall handling.

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