[Bug 92916] [BXT-P APL] Can't light on HDMI monitor if boot up without monitor connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92916

--- Comment #14 from Imre Deak <imre.deak at intel.com> ---
(In reply to Jairo Miramontes from comment #13)
> Created attachment 121319 [details]
> (2)dmesg log with drm.debug=14 with a working setup, HDMI connected
> 
> Excuse me, this dmesg does have the drm.debug=14 option on
> Regards

Thanks. It looks like you have the following routing:
Host DDI0 <- LSPCON DP-HDMI converter chip on board <- HDMI connector

The driver outputs a DP signal which is converted by LSPCON to HDMI. Since we
don't have a support in the driver (yet) to configure the LSPCON chip this will
only work if BIOS has done so already, but it seems that BIOS will not
configure the chip if there isn't any display connected. LSPCON support is
being added atm, so we need to revisit this ticket when that's done. Not sure
what's the proper bugzilla status until then, I'm leaving this open for now.

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