x1unix · May 2, 2025 04:51
diff --git a/arch-on-mbp11-5-guide.md b/arch-on-mbp11-5-guide.md
diff --git a/dgpu-poweroff.service b/dgpu-poweroff.service
 [Unit]
 Description=Disable discrete GPU (vgaswitcheroo OFF)
 Requires=sys-kernel-debug.mount
 After=sys-kernel-debug.mount

 [Service]
 Type=oneshot
 ExecStart=/bin/sh -c 'echo OFF > /sys/kernel/debug/vgaswitcheroo/switch'

 [Install]
 WantedBy=multi-user.target suspend.target   # run at boot *and* after resume
diff --git a/vgasw.sh b/vgasw.sh
 #!/usr/bin/env sh
 set -e

 VGASW=/sys/kernel/debug/vgaswitcheroo/switch
 AMDGPU_PCI_ID='0000:01:00.0'
 AMDGPU_HDA_PCI_ID='0000:01:00.1'

 g_print() {
  sudo cat "$VGASW"
 }

 g_write_mode() {
  echo ":: Set mux mode to $1"
  sudo sh -c "echo $1 > $VGASW"
 }

 g_setmode() {
  if [ -z "$1" ]; then
    echo "Empty value. Allowed: OFF|ON|IGD|DIS|DIDG|DDIS|MIGD|MDIS"
    exit 100
  fi
  case "$1" in
    OFF | ON | IGD | DIS | DIGD | DDIS | MIGD | MDIS)
      g_write_mode "$1"
      ;;
    *)
      printf 'Bad GPU mode '$1'. Allowed values:\n%s\n' 'OFF | ON | IGD | DIS | DIGD | DDIS | MIGD | MDIS'
      exit 1
      ;;
  esac

  echo "Set VGASWitcheroo mode to $1"
 }

 g_turnoff() {
  g_setmode IGD
  g_setmode OFF
  g_print
 }

 g_turnon() {
  g_setmode ON
  g_print
 }

 g_powerstate() {
  f="/sys/bus/pci/devices/$AMDGPU_PCI_ID"

  echo ":: AMDGPU Power state:"
  if [ ! -d "$f" ]; then
    echo 'GPU device not found'
    return 0
  fi

  acpi_state=$(cat "$f/power_state" | tr -d '\n')
  dpm_state=$(cat "$f/power_dpm_state" | tr -d '\n')
  pwctl_state=$(cat "$f/power/control" | tr -d '\n')
  rt_status=$(cat "$f/power/runtime_status" | tr -d '\n')

  echo "- ACPI State:     $acpi_state"
  echo "- DPM State:      $dpm_state"
  echo "- Power Control:  $pwctl_state"
  echo "- Runtime Status: $rt_status"
 }

 g_get_devfs_device() {
  case "$1" in
    "card")
      readlink -f "/dev/dri/by-path/pci-$AMDGPU_PCI_ID-card" | tr -d '\n'
      ;;
    "hda")
      readlink -f "/dev/snd/by-path/pci-$AMDGPU_HDA_PCI_ID" | tr -d '\n'
      ;;
    "renderer")
      readlink -f "/dev/dri/by-path/pci-$AMDGPU_PCI_ID-render" | tr -d '\n'
      ;;
    *)
      echo "ERROR: g_get_devfs_device - bad type $1"
      exit 2
      ;;
  esac
 }

 g_consumers() {
  dev_card="$(g_get_devfs_device 'card')"
  dev_render="$(g_get_devfs_device 'renderer')"
  dev_hda="$(g_get_devfs_device 'hda')"

  echo ':: Consumers (GPU+SND)'
  sudo fuser -v "$dev_card" "$dev_render" "$dev_hda"
 }
 g_status() {
  echo ":: Devices"
  echo "- GPU: $(g_get_devfs_device 'card')"
  echo "- RND: $(g_get_devfs_device 'renderer')"
  echo "- HDA: $(g_get_devfs_device 'hda')"

  echo ":: Framebuffer:"
  cat /sys/class/graphics/fb*/name

  g_powerstate

  echo ':: apple-gmux status:'
  g_print

  g_consumers
 }

 g_printenv() {
  dev_card="$(g_get_devfs_device 'card')"
  dev_render="$(g_get_devfs_device 'renderer')"
  dev_hda="$(g_get_devfs_device 'hda')"

  echo "AMDGPU_PCI_ID='$AMDGPU_PCI_ID'"
  echo "AMDGPU_HDA_PCI_ID=$AMDGPU_HDA_PCI_ID"
  echo "AMDGPU_DRI_CARD='$dev_card'"
  echo "AMDGPU_DRI_RENDER='$dev_render'"
  echo "AMDGPU_SND_CTRL='$dev_hda'"
  echo "AMDGPU_DEV='/sys/bus/pci/devices/$AMDGPU_PCI_ID'"
  echo "VGASW_DEV='/sys/kernel/debug/vgaswitcheroo/switch'"
 }

 case "$1" in
  print | v)
    g_status
    ;;
  on)
    g_turnon
    ;;
  off)
    g_turnoff
    ;;
  e | env)
    g_printenv
    ;;
  w | write)
    g_setmode "$2"
    ;;
  *)
    printf 'Usage: %s [v|w|on|off]\nTool to debug and control dGPU power management on MacBooks\n\n' "$0"
    echo "off - Disable discrette gpu"
    echo "on  - Disable discrette gpu"
    echo "v   - Print current vgaswitcheroo switch status"
    echo "w   - Write a value into '$VGASW'"
    echo "e   - Dump paths"
    ;;
 esac
	[Unit]
	Description=Disable discrete GPU (vgaswitcheroo OFF)
	Requires=sys-kernel-debug.mount
	After=sys-kernel-debug.mount

	[Service]
	Type=oneshot
	ExecStart=/bin/sh -c 'echo OFF > /sys/kernel/debug/vgaswitcheroo/switch'

	[Install]
	WantedBy=multi-user.target suspend.target # run at boot and after resume
	#!/usr/bin/env sh
	set -e

	VGASW=/sys/kernel/debug/vgaswitcheroo/switch
	AMDGPU_PCI_ID='0000:01:00.0'
	AMDGPU_HDA_PCI_ID='0000:01:00.1'

	g_print() {
	sudo cat "$VGASW"
	}

	g_write_mode() {
	echo ":: Set mux mode to $1"
	sudo sh -c "echo $1 > $VGASW"
	}

	g_setmode() {
	if [ -z "$1" ]; then
	echo "Empty value. Allowed: OFF\|ON\|IGD\|DIS\|DIDG\|DDIS\|MIGD\|MDIS"
	exit 100
	fi
	case "$1" in
	OFF \| ON \| IGD \| DIS \| DIGD \| DDIS \| MIGD \| MDIS)
	g_write_mode "$1"
	;;
	*)
	printf 'Bad GPU mode '$1'. Allowed values:\n%s\n' 'OFF \| ON \| IGD \| DIS \| DIGD \| DDIS \| MIGD \| MDIS'
	exit 1
	;;
	esac

	echo "Set VGASWitcheroo mode to $1"
	}

	g_turnoff() {
	g_setmode IGD
	g_setmode OFF
	g_print
	}

	g_turnon() {
	g_setmode ON
	g_print
	}

	g_powerstate() {
	f="/sys/bus/pci/devices/$AMDGPU_PCI_ID"

	echo ":: AMDGPU Power state:"
	if [ ! -d "$f" ]; then
	echo 'GPU device not found'
	return 0
	fi

	acpi_state=$(cat "$f/power_state" \| tr -d '\n')
	dpm_state=$(cat "$f/power_dpm_state" \| tr -d '\n')
	pwctl_state=$(cat "$f/power/control" \| tr -d '\n')
	rt_status=$(cat "$f/power/runtime_status" \| tr -d '\n')

	echo "- ACPI State: $acpi_state"
	echo "- DPM State: $dpm_state"
	echo "- Power Control: $pwctl_state"
	echo "- Runtime Status: $rt_status"
	}

	g_get_devfs_device() {
	case "$1" in
	"card")
	readlink -f "/dev/dri/by-path/pci-$AMDGPU_PCI_ID-card" \| tr -d '\n'
	;;
	"hda")
	readlink -f "/dev/snd/by-path/pci-$AMDGPU_HDA_PCI_ID" \| tr -d '\n'
	;;
	"renderer")
	readlink -f "/dev/dri/by-path/pci-$AMDGPU_PCI_ID-render" \| tr -d '\n'
	;;
	*)
	echo "ERROR: g_get_devfs_device - bad type $1"
	exit 2
	;;
	esac
	}

	g_consumers() {
	dev_card="$(g_get_devfs_device 'card')"
	dev_render="$(g_get_devfs_device 'renderer')"
	dev_hda="$(g_get_devfs_device 'hda')"

	echo ':: Consumers (GPU+SND)'
	sudo fuser -v "$dev_card" "$dev_render" "$dev_hda"
	}
	g_status() {
	echo ":: Devices"
	echo "- GPU: $(g_get_devfs_device 'card')"
	echo "- RND: $(g_get_devfs_device 'renderer')"
	echo "- HDA: $(g_get_devfs_device 'hda')"

	echo ":: Framebuffer:"
	cat /sys/class/graphics/fb*/name

	g_powerstate

	echo ':: apple-gmux status:'
	g_print

	g_consumers
	}

	g_printenv() {
	dev_card="$(g_get_devfs_device 'card')"
	dev_render="$(g_get_devfs_device 'renderer')"
	dev_hda="$(g_get_devfs_device 'hda')"

	echo "AMDGPU_PCI_ID='$AMDGPU_PCI_ID'"
	echo "AMDGPU_HDA_PCI_ID=$AMDGPU_HDA_PCI_ID"
	echo "AMDGPU_DRI_CARD='$dev_card'"
	echo "AMDGPU_DRI_RENDER='$dev_render'"
	echo "AMDGPU_SND_CTRL='$dev_hda'"
	echo "AMDGPU_DEV='/sys/bus/pci/devices/$AMDGPU_PCI_ID'"
	echo "VGASW_DEV='/sys/kernel/debug/vgaswitcheroo/switch'"
	}

	case "$1" in
	print \| v)
	g_status
	;;
	on)
	g_turnon
	;;
	off)
	g_turnoff
	;;
	e \| env)
	g_printenv
	;;
	w \| write)
	g_setmode "$2"
	;;
	*)
	printf 'Usage: %s [v\|w\|on\|off]\nTool to debug and control dGPU power management on MacBooks\n\n' "$0"
	echo "off - Disable discrette gpu"
	echo "on - Disable discrette gpu"
	echo "v - Print current vgaswitcheroo switch status"
	echo "w - Write a value into '$VGASW'"
	echo "e - Dump paths"
	;;
	esac