[Intel-gfx] Help to enable Iris Pro on Retina MBP 11.3

[Dave Airlie]

On Wed, Jan 8, 2014 at 7:12 PM, Jani Nikula <jani.nikula at linux.intel.com> wrote:
> On Tue, 07 Jan 2014, "Lu, Ran" <hephooey at gmail.com> wrote:
>> Hi Jani,
>>
>> As a matter of fact, I tried kernel from 3.9 to 3.13-rc6, all of them cannot
>> read the pci information from 0:2.0, and lspci do not have Iris Pro as a video
>> controller. I put in the attachment dmesg output from 3.12.6, I added some
>> printk to show the results from pci_bus_read_dev_vendor_id, otherwise it is a
>> vanilla kernel. I do not think I get any extra information by adding
>> drm.debug=0xe because the pci device is never registered properly, but it was
>> there anyway.The weird thing is grub can read pci device fine, I took a picture
>> since I do not know how to save outputs in grub console. I did some test with
>> another laptop with a working HD 4600. It seems even if I use setpci -s 0:2.0
>> 4.b=0 to disable the device, it is still responsive to further setpci and I
>> can bring it back by setting 4.b=7. Now it does not look like the video card
>> is disable. I guess maybe something wrong in the ACPI table triggered the
>> kernel to read the wrong place. But still strange it only missed that
>> particular bus. In case you are interested, I also put the dsdt table in the
>> attachment, I can provide other tables if they are important.
>
> I don't have much clues here. Are there any bios settings you could
> tweak? Did you try without the nvidia driver loaded?
>

The EFI disables it, at least as on the previous model.

It was possible to install an ap under OSX set the intel gfx as the default,
and reboot.

Dave.