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

[Lu, Ran]

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.

-- 
Best Regards,
LR

On Tuesday 07 January 2014 10:02:02, Jani Nikula wrote：
> On Mon, 06 Jan 2014, "Lu, Ran" <hephooey at gmail.com> wrote:
> > I just got a Retina MBP with Iris Pro and Nvidia GT 750. The iGPU works in
> > OSX(Mavericks), but when I boot into Linux, the device was disabled. I
> > debugged the kernel a little, apparently when pci_bus_read_dev_vendor_id
> > is
> > called for PCI 00:2.0 (the intel gpu), it returns -1 which indicates the
> > device is disabled.
> > 
> > I can check all the registers in grub using setpci or pcidump, so it seems
> > before boot into the kernel the device is actually online, and I am
> > looking
> > for some magical registers that I can set to enable the device. I did a
> > ioreg
> > -l in OSX and the information about Iris Pro looks like this:
> Kernel version? Dmesg from early boot with drm.debug=0xe module
> parameter?
> 
> BR,
> Jani.
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