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

[Jani Nikula]

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.



-- 
Jani Nikula, Intel Open Source Technology Center