theupriser/steamify-cachyos
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feat: Power-off fix for the Steam Machine; the kernel pin is optional

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Kernels >= 7.2 keep the firmware's S4/S5 wake bit on GPIO pin 18, so the
Steam Machine starts again right after powering off. Steam Machine
support now builds a DKMS module (patches/steamify-fremont-poweroff.c)
that clears it before power-off, for every kernel. The kernel pin is no
longer ticked by default. Module sources and patches move to patches/,
embedded by the single-file build.
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theupriser committed 2026-09-27 12:13:23 +02:00
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commit 443dbcdfb8
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lib/fremont-poweroff.sh
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#!/bin/bash
# Part of "Steam Machine support": the Steam Machine powers off instead of
# booting up again, on every kernel. Since Linux 7.2 ("pinctrl-amd: Don't
# clear S4 wake bits at probe") the S4/S5 wake bit the firmware leaves set
# on GPIO pin 18 stays set, and the machine starts again right after
# powering off (the reason for the kernel pin). Valve's kernel clears it at
# probe on Fremont, in a patch not meant for upstream, so CachyOS won't get
# it. A small module (patches/steamify-fremont-poweroff.c) clears it right
# before power-off; DKMS builds it for every kernel. On kernels that clear it themselves it does nothing.
# Sourced by steamify.sh; not meant to be run on its own.
POWEROFF_DKMS_NAME=steamify-fremont-poweroff
POWEROFF_DKMS_VER=1
POWEROFF_DKMS_SRC="/usr/src/$POWEROFF_DKMS_NAME-$POWEROFF_DKMS_VER"
POWEROFF_MODULES_LOAD=/etc/modules-load.d/steamify-fremont-poweroff.conf
poweroff_fix_installed() { [[ -f "$POWEROFF_DKMS_SRC/dkms.conf" && -f "$POWEROFF_MODULES_LOAD" ]]; }
poweroff_fix_enable() {
detect_valve_fremont || return 0
local tmp k
if ! pacman -Q dkms >/dev/null 2>&1; then
sudo pacman -S --needed --noconfirm dkms || { err "Installing dkms failed."; return 1; }
fi
install_kernel_headers || return 1
tmp="$(mktemp -d)"
patch_file "$POWEROFF_DKMS_NAME.c" > "$tmp/$POWEROFF_DKMS_NAME.c"
echo "obj-m += $POWEROFF_DKMS_NAME.o" >"$tmp/Makefile"
printf '%s\n' "# Written by Steamify: the Steam Machine powers off instead of booting up again." \
"PACKAGE_NAME=\"$POWEROFF_DKMS_NAME\"" "PACKAGE_VERSION=\"$POWEROFF_DKMS_VER\"" \
"BUILT_MODULE_NAME[0]=\"$POWEROFF_DKMS_NAME\"" 'DEST_MODULE_LOCATION[0]="/updates/dkms"' \
'AUTOINSTALL="yes"' >"$tmp/dkms.conf"
sudo dkms remove "$POWEROFF_DKMS_NAME/$POWEROFF_DKMS_VER" --all >/dev/null 2>&1
sudo rm -rf "$POWEROFF_DKMS_SRC"
sudo install -d "$POWEROFF_DKMS_SRC" &&
sudo install -m644 "$tmp"/{"$POWEROFF_DKMS_NAME.c",Makefile,dkms.conf} "$POWEROFF_DKMS_SRC/"
rm -rf "$tmp"
sudo dkms add "$POWEROFF_DKMS_NAME/$POWEROFF_DKMS_VER" >/dev/null ||
{ err "Adding the power-off fix to DKMS failed."; return 1; }
for k in /usr/lib/modules/*/build; do
k="$(basename "$(dirname "$k")")"
info "Building the power-off fix for $k..."
sudo dkms install "$POWEROFF_DKMS_NAME/$POWEROFF_DKMS_VER" -k "$k" >/dev/null ||
warn "Building the power-off fix for $k failed; with that kernel it may start again after shutting down."
done
echo "$POWEROFF_DKMS_NAME" | sudo tee "$POWEROFF_MODULES_LOAD" >/dev/null
sudo modprobe "$POWEROFF_DKMS_NAME" 2>/dev/null
return 0
}
poweroff_fix_disable() {
sudo rm -f "$POWEROFF_MODULES_LOAD"
sudo modprobe -r "$POWEROFF_DKMS_NAME" 2>/dev/null
[[ -d "$POWEROFF_DKMS_SRC" ]] || return 0
sudo dkms remove "$POWEROFF_DKMS_NAME/$POWEROFF_DKMS_VER" --all >/dev/null 2>&1
sudo rm -rf "$POWEROFF_DKMS_SRC"
}