Dasharo
No HDMI output in FW on V540TU and V560TU
Component
Dasharo firmware
Device
NovaCustom V54 14th Gen
Dasharo version
v0.9.0-rc7
Dasharo Tools Suite version
No response
Brief summary
There's no HDMI output in FW on V540TU, neither with the lid open nor shut
How reproducible
100%
How to reproduce
Plug in a HDMI cable and check if you see anything on the monitor, get into setup menu, try with the lid shut and open
Expected behavior
There should be HDMI video output in FW when the lid is shut
Actual behavior
No HDMI output in FW on V540TU
Screenshots
No response
Additional context
Tested on both 16:9 and 16:10 aspect ratio monitors
Solutions you've tried
No response
The GOP driver doesn't support HDMI 2.1 FRL. The port is configured for FRL 10Gbps, so maybe that's why it doesn't work. Although I would expect GOP to fall back to TMDS signaling for FRL-enabled ports
@mkopec Understood, do you have any suggestion for improvements here, or not really?
@wessel-novacustom how about your judgment of importance here? I think it would be definitely nice to have, but maybe not that critical if it would be too complex (time-consuming) to handle right now.
@macpijan I just tested disabling FRL and disabling the fixed mode feature we enabled for scaling, and it didn't help. I'm not sure what's going wrong here, GPIOs and VBT are configured correctly so GOP should Just Work.
@mkopec Understood, do you have any suggestion for improvements here, or not really?
@wessel-novacustom how about your judgment of importance here? I think it would be definitely nice to have, but maybe not that critical if it would be too complex (time-consuming) to handle right now.
Not important enough to fix it before the first release.
Set of PRs fixing the issue: https://github.com/Dasharo/coreboot/pull/547 https://github.com/Dasharo/edk2/pull/162
The GraphicsPeim in FSP has some problems with initializing the HDMI, but EFI x64 GOP driver initializes all possible displays (LCD -when lid open, Type-C and HDMI).
Applies to dGPU models too - on those models the HDMI port is wired to the discrete graphics, so we'd have to somehow handle dual GPUs in UEFI.
Dual GPUs are handled by UEFI payload since "always". UEFI prints the output to all GOPs found. We only have to make sure the NVidia GOP is installed by its Option ROM, that's all.
Running Intel GOP and Nvidia GOP from the opROM in UEFI, when screen resolutions aren't the same, causes artifacts in the setup menu. The logo is rendered in the topleft corner and text is rendered in the wrong place. So it doesn't just work right out of the box
Okay, then set the PCDs for resolution to a fixed value. The problem is that we configured fixed resolution in VBT, while by default it should initialize max resolution, like the nvidia GOP
No HDMI output in FW on V540TND with Dasharo v0.9.1-rc5. Tried two monitors and two cables. Also tried closing/opening the lid.
Partially implemented in rc6. There is an issue with iGPU driver not loading when both iGPU and dGPU monitors are connected in UEFI. May be removed in future versions.
With v0.9.1-rc6 on v540tnd HDMI output in firmware seems to appear without any issues. Both with lid closed/open.
For me with V54 Intel-only notebook and running Dasharo coreboot 1.0.0, there still is no HDMI output on firmware.
