ubuntu-x-swat team mailing list archive

[Albert Vilella <avilella@xxxxxxxxx>]

Hi,

After inspecting the contents of 2 MSI Megabook DSDT.dsl tables we've got, it looks like the calls to switch on/off graphics card in this
laptop model are:

^^^MXR0.MXM0._ON
^^^MXR0.MXM0._OFF
^^^MXR0.MXM0._STA

so instead of using the method below, which works in Asus UL*0V models:

status = acpi_get_handle(root_handle, "\\_SB.PCI0.P0P1.VGA._OFF",
&handle);

one would use this:

status = acpi_get_handle(root_handle, "\\_SB.PCI0.MXR0.MXM0._OFF",
&handle);

See a modified version of the module and makefile:

msi_nvidia.c
========================================================
#include <acpi/acpi.h>
#include <linux/suspend.h>

MODULE_LICENSE("GPL");

static acpi_handle root_handle;

static int kill_nvidia(void)
{
    acpi_status status;
    // The device handle
    acpi_handle handle;
    struct acpi_object_list args;
    // For the return value
    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

    status = acpi_get_handle(root_handle, "\\_SB.PCI0.MXR0.MXM0._OFF", &amp;handle);
    if (ACPI_FAILURE(status))
    {
        printk("%s: cannot get ACPI handle: %s\n", __func__, acpi_format_exception(status));
        return -ENOSYS;
    }

    args.count = 0;
    args.pointer = NULL;

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

    printk("%s: disabled the discrete graphics card\n",__func__);
    return 0;
}

static int power_event(struct notifier_block *this, unsigned long event,
                       void *ptr)
{
        switch (event) {
        case PM_POST_HIBERNATION:
                kill_nvidia();
                return NOTIFY_DONE;
        case PM_POST_SUSPEND:
        case PM_HIBERNATION_PREPARE:
        case PM_SUSPEND_PREPARE:
        default:
                return NOTIFY_DONE;
        }
}

static struct notifier_block power_notifier = {
        .notifier_call = power_event,
};

static int __init msi_nvidia(void)
{
    int ret = register_pm_notifier(&amp;power_notifier);
    if (ret) return ret;
    return kill_nvidia();
}

static void dummy(void)
{
}

module_init(msi_nvidia);
module_exit(dummy);
========================================================

Makefile
========================================================
ifneq ($(KERNELRELEASE),)
  obj-m := msi_nvidia.o
else
  KERNELDIR ?= /lib/modules/$(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
========================================================

-- 
support graphics card hot switch
https://bugs.launchpad.net/bugs/312756
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