Charcoal SteamOS Kernel

Works on Steam Deck and possibly other AMD based handheld PCs.

Changes to Neptune

• Add WiFi patches from OpenWRT
• Change maximum allowed CPU frequency on Steam Deck from 3.5 to 4.2 GHz (as requested on Discord)
• Change maximum PPT limit on Steam Deck from 30 to 50 watt (as requested at #5)
• Add wait on multiple futexes opcode for fsync (from tkg)
• Add BORE
• Add ADIOS
• Add re-swappiness
• Add zram-ir
• Add kcompressd-unofficial
• Switch default DRM scheduling policy to round-robin
• Optimize kernel with -O3 (from tkg)
• Optimize for Zen 2 (from Gentoo)
• Build with LLVM + LTO + polly
• Build-in various always needed modules for LTO to shine even more
• Disable a lot of debugging
• Disable CPU mitigations
• Disable sound input validation
• Disable various unneeded things (open a bug report in case something you need is missing)
• Switch CPU IDLE sheduler
• Add some Clear Linux patches (from tkg)
• Add some Zen Linux patches
• Small fixes (from Gentoo)
• Fix dkms with LLVM clang (from CachyOS)
• Add ryzen_smu
• Add xone, xpad-noone and xpadneo
• Add NTSYNC (from CachyOS) Valve added it to 6.11.11-valve27
• Add Binder module (for Waydroid) Arch Linux enabled it with 6.12.7
• Switch sheduling frequency to 1000 Hz Arch Linux changed it with 6.13.1
• Update zstd (from CachyOS) No longer needed for modern kernels

Install

Download the latest release and run the following on your Steam Deck:

cd ~/Downloads
sudo steamos-readonly disable
sudo pacman -U linux-charcoal-*-x86_64.pkg.tar.zst # Confirm when it asks you to remove linux-neptune-*
sudo steamos-readonly enable
rm linux-charcoal*

Note that you'll see erros like ==> ERROR: module not found: 'ata_generic' but these are really just bad worded harmless warnings. Reboot and check uname -a to see the new kernel. If the string contains charcoal installation worked correctly.