[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 #9 from Imre Deak <imre.deak at intel.com> ---
(In reply to Pacho Ramos from comment #8)
> Created attachment 131467 [details]
> dmesg with debug 14 and HDMI connected to a TV
> 
> This is the log anyway ;)

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.

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.

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