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List:       freedesktop-xorg
Subject:    Non-EDID Device Info
From:       Trevor Childs <trevor () netmsi ! com>
Date:       2017-07-19 19:14:32
Message-ID: CA+1_jbb4xkxa2mOzTsokg73iqCYqGCnZmLRO-qJMqu+GBRafgg () mail ! gmail ! com
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I'm working with an output device that normally takes in SDI inputs. I am
using an HDMI to SDI converter, but it means that the EDID information
reported over HDMI is inaccurate to the output device. If I attempt to boot
with X11 auto-detecting everything, it doesn't work (blank screen with
low-resolution signal).

If I boot with the HDMI plugged into a monitor that has the same max
resolution and refresh rate as my target device, X11 sets up properly. If I
then unplug the monitor and plug into the converter, the settings stay the
same and it works.

I copied the monitor's EDID to a file, and got the modeline for the working
video mode. xorg.conf is set up to load the EDID from the file, add in the
modeline, and select that mode. I have confirmed that this is all working
by looking at Xorg.0.log. It looks like something is still missing though,
as the behavior is exactly the same as before (device fails; monitor works;
hotswap from monitor makes device work).

Is there any other information I can add to xorg.conf to make the system
think it's plugged into the working monitor during it's initial setup?

[Attachment #5 (text/html)]

<div dir="ltr">I&#39;m working with an output device that normally takes in SDI \
inputs. I am using an HDMI to SDI converter, but it means that the EDID information \
reported over HDMI is inaccurate to the output device. If I attempt to boot with X11 \
auto-detecting everything, it doesn&#39;t work (blank screen with low-resolution \
signal).<div><br></div><div>If I boot with the HDMI plugged into a monitor that has \
the same max resolution and refresh rate as my target device, X11 sets up properly. \
If I then unplug the monitor and plug into the converter, the settings stay the same \
and it works.</div><div><br></div><div>I copied the monitor&#39;s EDID to a file, and \
got the modeline for the working video mode. xorg.conf is set up to load the EDID \
from the file, add in the modeline, and select that mode. I have confirmed that this \
is all working by looking at Xorg.0.log. It looks like something is still missing \
though, as the behavior is exactly the same as before (device fails; monitor works; \
hotswap from monitor makes device work).</div><div><br></div><div>Is there any other \
information I can add to xorg.conf to make the system think it&#39;s plugged into the \
working monitor during it&#39;s initial setup?</div></div>


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