[Bug 101163] [drm:intel_modeset_init] *ERROR* LSPCON init failed on port B

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101163

--- Comment #10 from Pacho Ramos <pachoramos1 at gmail.com> ---
(In reply to Imre Deak from comment #9)
> I assume that BIOS doesn't light up the HDMI output either. My guess is that
> the HDMI connector is wired to the Nvidia card, while the panel to the IGD.
> 
> You could confirm what is the actual wiring either asking from DELL, or if
> possible in Windows by disabling the Intel driver, leaving only the Nvidia
> driver enabled. You could also check if there is a BIOS setup option to
> change the output, although it could be hard-wired without muxing capability.

I have no option in BIOS to change the output sadly :( and, as I don't have
Windows... I guess I will need to contact Dell :/

> 
> If the output is connected to the Nvidia card, you wouldn't need reverse
> PRIME to enable it. Depending on the connection (native HDMI or via an
> LSPCON DP->HDMI converter) you may also need LSPCON support in the Nouveau
> driver, not sure if it exists.

How would that be handled? For now I have tried to rely on reverse prime but it
doesn't work because it makes X to crash :S
xrandr --setprovideroutputsource nouveau modesetting
xrandr --output HDMI-1-1 --auto --above eDP-1  => this causes the crashes and,
per bash-completion, I can use DP-1 or HDMI-1-1 apart of eDP-1 as --above
argument... but all fail in the same way (as gnome-control-center does when
trying to use that HDMI output from it)

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