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

[Steven Newbury]

On Wed, 2014-01-08 at 11:12 +0200, Jani Nikula 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?
> 
> BR,
> Jani.
> 
> 

Might it be unable to allocate enough PCI address or it gets allocated
above 4G?  There are patches queued up for pci-next (plus a few in my
tree for i915; I need to get back to these) to get PCI address space
above 4G working.  Probably unrelated...