Dear Philipp, dear all,

On So, 07 Jun 2009, Philipp Blanke wrote:
> I just compiled a tutorial for the configuration of the graphic cards. See
> the attached ODT or PDF.

First of all thanks for the tutorial, much appreciated, and it worked
like a charm here on Debian/sid.

> Feedback welcome. Please point out errors.

Two shutdown-reboot cycles were necessary on my laptop since I have
never before played around with switching graphics cards.

Another more important thing is energy saving.

When loading sony-laptop with speed_stamina=3 nothing is touched at the
graphics card side, so the other (not working) graphics card is not
actually turned off, means it takes much more energy.

Fortunately Matthew has written a simple module
that turns off the nvidia graphic card.

So I have adjusted your 
so that in the Intel section it does
        modprobe nvidia-control

To make sure that nvidia-control is NOT loaded by default I also put
        blacklist nvidia-control
into /etc/modprobe.d/sony-laptop.conf

Combining those two I can get again down to 10W on battery.

For completeness I attached the last code I have seen from Matthew for
nvidia-control.c and the Makefile.

Best wishes


Dr. Norbert Preining <>        Vienna University of Technology
Debian Developer <>                         Debian TeX Group
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SCRABBY (n.) A curious-shaped duster given to you by your mother which
on closer inspection turns out to be half an underpant.
                        --- Douglas Adams, The Meaning of Liff
obj-m += nvidia-control.o

        make -C /lib/modules/`uname -r`/build M=`pwd`
#include <linux/acpi.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <linux/pci.h>

static int nvidia_dsm(struct pci_dev *dev, int func, int arg, int *result)
	static char muid[] = {
		0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
		0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,

	struct acpi_handle *handle;
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_object_list input;
	union acpi_object params[4];
	union acpi_object *obj;
	int err;

	handle = DEVICE_ACPI_HANDLE(&dev->dev);

	if (!handle)
		return -ENODEV;

	input.count = 4;
	input.pointer = params;
	params[0].type = ACPI_TYPE_BUFFER;
	params[0].buffer.length = sizeof(muid);
	params[0].buffer.pointer = (char *)muid;
	params[1].type = ACPI_TYPE_INTEGER;
	params[1].integer.value = 0x00000102;
	params[2].type = ACPI_TYPE_INTEGER;
	params[2].integer.value = func;
	params[3].type = ACPI_TYPE_INTEGER;
	params[3].integer.value = arg;

	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
	if (err) {
		printk(KERN_ERR "nvidia-control: failed to evaluate _DSM: %d\n",
		return err;

	obj = (union acpi_object *)output.pointer;

	if (obj->type == ACPI_TYPE_INTEGER)
		if (obj->integer.value == 0x80000002)
			return -ENODEV;

	if (obj->type == ACPI_TYPE_BUFFER) {
		if (obj->buffer.length == 4 && result) {
			*result = 0;
			*result |= obj->buffer.pointer[0];
			*result |= (obj->buffer.pointer[1] << 8);
			*result |= (obj->buffer.pointer[2] << 16);
			*result |= (obj->buffer.pointer[3] << 24);

	return 0;

int nvidia_control_setup(struct pci_dev *dev)
	int result;

	if (nvidia_dsm(dev, 1, 0, &result))
		return -ENODEV;

	printk(KERN_INFO "nvidia-control: hardware status gave 0x%x\n", result);

	if (result &= 0x1) {	/* Stamina mode - disable the external GPU */
		nvidia_dsm(dev, 0x2, 0x11, NULL);
		nvidia_dsm(dev, 0x3, 0x02, NULL);
	} else {		/* Ensure that the external GPU is enabled */
		nvidia_dsm(dev, 0x2, 0x12, NULL);
		nvidia_dsm(dev, 0x3, 0x01, NULL);

	return 0;

int nvidia_control_probe(struct pci_dev *dev)
	int support = 0;
	if (nvidia_dsm(dev, 0, 0, &support))
		 return -ENODEV;

	if (!support)
		return -ENODEV;

	return 0;

static int __init nvidia_control_init(void)
	struct pci_dev *dev = NULL;
	while ((dev = pci_get_device(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, dev))) {
		if (dev->class == 0x30000)
			if (!nvidia_control_probe(dev))
	return 0;

static void __exit nvidia_control_exit(void)

static const struct pci_device_id pci_ids [] = {
	  (PCI_CLASS_DISPLAY_VGA << 8), 0xffff00},
	{ },

MODULE_DEVICE_TABLE(pci, pci_ids);


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