hp-dm3 team mailing list archive

[Albert Vilella <avilella@xxxxxxxxx>]

(this one is correct, I forgot to modify the code call in the previous email)

Hi,

After inspecting the DSDT.dsl files from a HP Pavilion dm3 1020ec
model, it looks like we can modify one of the existing
modules to have switchable graphics for the dm3 series.

(infot taken from this URL:
http://ubuntuforums.org/showpost.php?p=7933876&postcount=11)

Save the following as dm3_acpi.c
==============================
/* Linux kernel module that disables the discrete graphics board for
 * HP dm3 series laptops.
 *
 * Copyright (c) 2009: Sylvain Joyeux <sylvain.joyeux@xxxxxxx>
 */
#include <acpi/acpi.h>

MODULE_LICENSE("GPL");

static acpi_handle root_handle;

static int __init kill_ati(void)
{
   int i;
   acpi_status status;
   // The device handle
   acpi_handle handle;
   // The package elements
   union acpi_object package_elements[3];
   // The arguments to ATPX
   union acpi_object atpx_arg_elements[2];
   struct acpi_object_list atpx_arg;
   // For the return value of ATPX
   struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

   status = acpi_get_handle(root_handle, "\\_SB.PCI0.AGP.VGA.ATPX", &handle);
   if (ACPI_FAILURE(status))
   {
       status = acpi_get_handle(root_handle, "\\_SB_.PCI0.OVGA.XTPX", &handle);
       if (ACPI_FAILURE(status))
       {
           printk("dm3_acpi: cannot get ACPI handle: %s\n",
acpi_format_exception(status));
           return -ENOSYS;
       }
       printk("dm3_acpi: in discrete graphics mode\n");
       return 0;
   }

   for (i = 0; i < 3; ++i)
   {
       package_elements[i].type = ACPI_TYPE_INTEGER;
       package_elements[i].integer.value = 0;
   }

   atpx_arg.count = 2;
   atpx_arg.pointer = &atpx_arg_elements[0];

   atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;
   atpx_arg_elements[0].integer.value = 2;

   atpx_arg_elements[1].type = ACPI_TYPE_PACKAGE;
   atpx_arg_elements[1].package.count = 3;
   atpx_arg_elements[1].package.elements = &package_elements[0];

   status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer);
   if (ACPI_FAILURE(status))
   {
       printk("dm3_acpi: ATPX method call failed: %s\n",
acpi_format_exception(status));
       return -ENOSYS;
   }
   kfree(buffer.pointer);

   printk("dm3_acpi: disabled the discrete graphics card\n");
   return 0;
}

static void dummy(void)
{
}

module_init(kill_ati);
module_exit(dummy);
=============================

Save the following as Makefile:
=============================
ifneq ($(KERNELRELEASE),)
 obj-m := dm3_acpi.o
else
 KERNELDIR ?= /lib/modules/$(shell uname -r)/build
 PWD := $(shell pwd)

default:
       $(MAKE) -C $(KERNELDIR) M=$(PWD) $(EXTRA_FLAGS) modules

clean:
       $(MAKE) -C $(KERNELDIR) M=$(PWD) $(EXTRA_FLAGS) clean

endif
=============================

In the same folder, run the following commands:

make
sudo cp dm3_acpi.ko /lib/modules/`uname -r`/kernel/
sudo depmod
echo dm3_acpi | sudo tee -a /etc/modules > /dev/null

Can people report back if it works?

Cheers,

Albert.