No HDMI output in firmware

[johanes2115]

Device

Novacustom TGL

Dasharo version

v1.7.0

Affected component(s) or functionality

HDMI output

Brief summary

There is no HDMI output in firmware, which makes remote automatic validation not possible.

How reproducible

100%

How to reproduce

1. Connect external HDMI output
2. Power on the device

Expected behavior

HDMI output in firmware.

Actual behavior

No HDMI output in firmware.

Screenshots

No response

Additional context

No response

Solutions you've tried

No response

[mkopec]

AlderLake FSP has a LidStatus option that tells the GOP driver which screen to use. Looks like TigerLake FSP doesn't have it. Not sure what can be done here. Maybe have 2 VBTs in CBFS and switch between them depending on lid state? @miczyg1

[miczyg1]

Unfixable. TGL FSP creates the GOPPolicy with GetPlatformLidStatus returning EFI_UNSUPPORTED. So unless you hack your own FSP and expose such option, this is not doable.

[pietrushnic]

@miczyg1 AFAIK, we should be able to do that. Another reason is to choose Dasharo.

[miczyg1]

@miczyg1 AFAIK, we should be able to do that. Another reason is to choose Dasharo.

Yes, we can.

[macpijan]

There is no HDMI output in firmware, which makes remote automatic validation not possible.

Just to make it clear here, we can still run automated tests as we do not really rely on the display in actual tests.
It is more convenient to use though, if we can remotely use the display, of course.

[mkopec]

If we really need this, we can just unplug the eDP cable, FSP will see it's missing and output to HDMI :^)

[mkopec]

@miczyg1 could we not just include the Intel GOP driver in UEFIPayload and run it with policy specified by UEFI instead of coreboot?

[mkopec]

If we really need this, we can just unplug the eDP cable, FSP will see it's missing and output to HDMI

Yeah, I needed KVM to debug issues with testing quicker, and just unplugged the eDP cable and I get FW on HDMI.