Comment 207 for bug 546393

You guys are probably all aware of this, but it seems like one solution is to have the bootloader kill the NV96 card on boot, if you're using grub2:

https://help.ubuntu.com/community/UEFIBooting#Selecting_the_graphic_card
http://askubuntu.com/questions/149921/how-to-add-a-command-permanently-to-grub2

One could also make an early quirk that does this as well based on a DMI match. I wrote up a quick patch to do that, but it's completely untested (see below). I doubt it'd be upstream-appropriate though, as it would kill the possibility of using the second card entirely.

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 230c8ea..8cb7665 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1357,6 +1357,12 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
        return 0;
 }

+static int __init disable_macbook_second_video(const struct dmi_system_id *d)
+{
+ outb(0, 0x750);
+ return 0;
+}
+
 /*
  * If your system is blacklisted here, but you find that acpi=force
  * works for you, please contact <email address hidden>
@@ -1432,6 +1438,15 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = {
                     DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
                     },
         },
+ {
+ .callback = disable_macbook_second_video,
+ .ident = "Apple MacBook5",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
+ },
+ },
+
        {}
 };