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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BXT-P APL] Can't light on HDMI monitor if boot up without monitor connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92916#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [BXT-P APL] Can't light on HDMI monitor if boot up without monitor connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92916">bug 92916</a>
from <span class="vcard"><a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> <span class="fn">Imre Deak</span></a>
</span></b>
<pre>(In reply to Jairo Miramontes from <a href="show_bug.cgi?id=92916#c13">comment #13</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=121319" name="attach_121319" title="(2)dmesg log with drm.debug=14 with a working setup, HDMI connected">attachment 121319</a> <a href="attachment.cgi?id=121319&action=edit" title="(2)dmesg log with drm.debug=14 with a working setup, HDMI connected">[details]</a></span>
> (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</span >
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.</pre>
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