ARCH AMD ISP4 HOOK

README.md

Ignore this. Use my patch instead idovitz/amdisp4#3

blacklist-amd-capture.conf

# /etc/modprobe.d/blacklist-amd-capture.conf
# Prevent autoloading by udev/kernel (critical for resume stability)
blacklist amd_capture
# Prevent manual modprobe without --ignore-install
install amd_capture /bin/false

cam-off

#!/usr/bin/env bash
#/usr/local/bin/cam-off
set -euo pipefail

MODULE="${MODULE:-amd_capture}"

# If any /dev/video* nodes are in use, show holders and refuse to unload
if ls /dev/video* >/dev/null 2>&1; then
  if sudo fuser -v /dev/video* 2>/dev/null; then
    echo "Camera appears in use. Close the app(s) above and retry." >&2
    exit 1
  fi
fi

# Unload the module (and anything that depends on it if possible)
sudo modprobe -r "$MODULE" || {
  echo "Failed to unload $MODULE (it may still be in use, or have dependents)." >&2
  exit 1
}

echo "Unloaded: $MODULE"

cam-on

#!/usr/bin/env bash
#/usr/local/bin/cam-on
set -euo pipefail

MODULE="${MODULE:-amd_capture}"

# --ignore-install bypasses "install amd_capture /bin/false" in modprobe.d
sudo modprobe --ignore-install "$MODULE"

echo "Loaded: $MODULE"

cam-suspend-guard

#!/usr/bin/env bash
#/usr/local/bin/cam-suspend-guard
set -euo pipefail

MODULE="${MODULE:-amd_capture}"
HOOK_PATH="/usr/lib/systemd/system-sleep/amd-camera"

usage() {
  cat <<USAGE
Usage:
  sudo cam-suspend-guard install
  sudo cam-suspend-guard remove
  sudo cam-suspend-guard status

Optional:
  MODULE=<name> sudo cam-suspend-guard install

Notes:
- "install" creates a system-sleep hook that unloads MODULE before suspend.
- After resume the module stays unloaded (use cam-on to reload).
USAGE
}

cmd="${1:-}"
case "$cmd" in
  install)
    sudo tee "$HOOK_PATH" >/dev/null <<HOOK
#!/usr/bin/env bash
set -euo pipefail

MODULE="${MODULE}"

case "\$1/\$2" in
  pre/*)
    /usr/bin/logger -t amd-camera "hook \$1/\$2: unloading \$MODULE"
    /usr/bin/modprobe -r "\$MODULE" 2>/dev/null || true
    ;;
  post/*)
    /usr/bin/logger -t amd-camera "hook \$1/\$2: \$MODULE left unloaded (use cam-on to reload)"
    ;;
esac
HOOK
    sudo chmod +x "$HOOK_PATH"
    echo "Installed suspend guard: $HOOK_PATH (MODULE=$MODULE)"
    ;;

  remove)
    if [[ -f "$HOOK_PATH" ]]; then
      sudo rm -f "$HOOK_PATH"
      echo "Removed suspend guard: $HOOK_PATH"
    else
      echo "Suspend guard not present: $HOOK_PATH"
    fi
    ;;

  status)
    if [[ -f "$HOOK_PATH" ]]; then
      echo "Suspend guard present: $HOOK_PATH"
      echo "----"
      cat "$HOOK_PATH"
    else
      echo "Suspend guard not present: $HOOK_PATH"
    fi
    ;;

  *)
    usage
    exit 1
    ;;
esac

USAGE

# Module: https://aur.archlinux.org/packages/amdisp4-dkms
sudo chmod +x /usr/local/bin/cam-suspend-guard
sudo chmod +x /usr/local/bin/cam-on
sudo chmod +x /usr/local/bin/cam-off
sudo cam-suspend-guard install
sudo cam-suspend-guard status
sudo cam-suspend-guard remove