Is your platform coreboot-supported, if yes - have you tested it with coreboot?

On Thu, Feb 25, 2021 at 9:09 PM Rao G <grao.v80@gmail.com> wrote:
>
> Hi Coreboot Team,
>
> There is an external Monitor which works on HDMI/DVI and also DP , In BIOS the display is good whereas in OS (Ubuntu 18.04) until the kernel is initialized and i915 Video driver
> is loaded display is perfect, looks like the i915 OS driver switches off the monitor and there is no signal
>
> Does ACPI GFX method have to return any External display specific data to the OS driver ?
> Tried to make changes to VBIOS but did not help, thought ASL code is missing under GFX0
>
> From the OS following data can be read
>
> External Monitor's EDID data can be read from I2C Bus
> Even VBT data from ACPI NVS can be read
>
>
> Tried to dig into some of these files
> https://github.com/torvalds/linux/tree/master/drivers/gpu/drm/i915/display
>
> intel_dp.c, intel_acpi.c to understand what function is turning off DP link
> when i have the OS debug driver logs, can send it across
>
> Any clues will help, appreciate your time
>
> PS:The platform has Intel BayTrail SoC, ValleyView chipset and VBIOS. The bios do not use GOP driver which replaces VBIOS
>
> Thanks
> Rao
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--
Best regards, Mike Banon
Open Source Community Manager of 3mdeb - https://3mdeb.com/