Hi Benjamin,
On Sat, Jan 4, 2020, 01:57 Benjamin Doron <[email protected]>
wrote:
> Hi again,
> I had the display working with Kabylake's VBT but without my laptop's
> dedicated graphics card. I've since been working on that.
>
Is this laptop using Nvidia Optimus? If so, the displays are only connected
to the integrated GPU.
I added the port for the dGPU ("device pci 01.0") to the devicetree,
> disabled "SkipExtGfxScan" and set "PrimaryDisplay" to Switchable Graphics,
> matching, as I see it, the vendor's configuration. This still does not make
> it work. The display backlight turns on but nothing ever appears on the
> display. I've even tried it with the added dGPU port as the sole change,
> with the same result.
>
> I've applied a minimal set of tweaks to the VBT (editing T3 time and PWM
> frequency to better match the display), but it's otherwise the same as
> Kabylake's VBT.
>
> What am I missing? Some PCIe configuration? A PCIe root port (vendor UEFI
> displays one more root port than lspci. I had thought that this could be
> for M.2/NVMe, whichever this system can support, but I could be wrong, even
> if "device pci 01.0" is commonly the GPU port)? Should I select
> ONBOARD_VGA_IS_PRIMARY? Or am I missing some other initialisation that only
> the OptionROM can do/some GPIO power stuff (I'm using TianoCore, which
> cannot run them. As Linux appears to ignore them, I thought that this
> doesn't matter)?
>
With libgfxinit, you don't need any VBIOS for the Intel GPU. The Nvidia GPU
might need a VBIOS, but I don't think you need to run it in coreboot, as
the OS should be able to handle it.
I'd appreciate any and all help.
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Best regards,
Angel
>
>
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