Karellen at 01:05, 22 July 2020

2020-07-22T01:05:56Z

← Older revision		Revision as of 01:05, 22 July 2020
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	{{redv\|Warning:\|The informations contained in this page can cause issues with your X if any errors or incorrect information is entered.}}		{{redv\|Warning:\|The informations contained in this page can cause issues with your X if any errors or incorrect information is entered.}}

	~~{{xorgnav}}~~

	==Outline==		==Outline==
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	{{how-to		{{how-to
	\|Step1=		\|Step1=
	Open a terminal session to your machine and backup any existing xorg.conf (either via [[SSH]] or locally).		Open a terminal session to your machine and backup any existing xorg.conf (either via SSH or locally).

	<syntaxhighlight lang="bash" enclose="div">sudo cp -pi /etc/X11/xorg.conf /etc/X11/xorg.conf.bak</syntaxhighlight>		<syntaxhighlight lang="bash" enclose="div">sudo cp -pi /etc/X11/xorg.conf /etc/X11/xorg.conf.bak</syntaxhighlight>

Niklas Holm: work in progress

2015-11-30T14:27:53Z

work in progress

New page

{{greenv|Information:|This page contains explanation about EDID generation and usage in xorg.conf}}
{{bluev|Advanced:|The information contained in this page is considered advanced.}}
{{redv|Warning:|The informations contained in this page can cause issues with your X if any errors or incorrect information is entered.}}

{{xorgnav}}

==Outline==
If your machine has a black screen only when you boot it up before the TV or AVR, follow this guide.

On some combinations of equipments ('''AVR/TV/XBMC'''), in rarer cases you may find that the order you power on your equipment matters. This is obviously inconvenient but can be easily fixed.

The root cause of this issue is the '''EDID''' (Extended display identification data) handshake. Xorg may not correctly handshake with '''AV''' equipment after boot. Typically this results in a black screen and a full system shut down and restart to rectify.

In this guide we will show you how to trick Xorg into thinking your AV equipment is connected and powered on at all times. This locks on your install to one monitor/AVR (port specific) and should stop all handshake issues.

This example is for a Nvidia GPU, other GPUs will have a similar approach but are not covered here.

==Introduction==
There are several methods for acquiring EDID information from Xorg.0.log, but in this page we use output from XRandR piped through grep and xxd which has the advantage of not having to restart the X server.

You'll need:

* Shell access.
* Sudo privileges
* parse-edid
* nvidia-xconfig

You should be running as normal user while following this guide, i.e. not as '''root'''
Any further references to "root" are meant to be interpreted as base directory not the user.

{{note|'''[http://manpages.ubuntu.com/manpages/trusty/man1/get-edid.1.html parse-edid]''' can be installed on Ubuntu with "sudo apt-get install read-edid"}}
{{note|'''[http://manpages.ubuntu.com/manpages/precise/man1/alt-nvidia-96-xconfig.1.html nvidia-xconfig]''' is already installed on Ubuntu and variants if you have the '''nvidia-current drivers installed''' via the Ubuntu packaging or X-swat PPA. This guide is not intended to instruct users on full use of this tool.}}

==Generating & using edid.bin==
Make sure your install is in a working state, powered on in the correct order so that you can see the GUI.

{{how-to
|Step1=
Open a terminal session to your machine and backup any existing xorg.conf (either via [[SSH]] or locally).

<syntaxhighlight lang="bash" enclose="div">sudo cp -pi /etc/X11/xorg.conf /etc/X11/xorg.conf.bak</syntaxhighlight>

|Step2=
You can use a current xorg.conf and should always have a backup of existing, however if you want to start with an fresh xorg.conf proceed with following step.
<syntaxhighlight lang="bash" enclose="div">
sudo nvidia-xconfig -s --no-logo --force-generate --output-xconfig=/etc/X11/xorg.conf
</syntaxhighlight>

|Step3=
Now we work out the display device name of your attached monitor

type:
<syntaxhighlight lang="bash" enclose="div">
grep "ConnectedMonitor" /var/log/Xorg.0.log |cut -f2 -d\"
</syntaxhighlight>

you should see message like the following:
<pre>
ConnectedMonitor
DFP-0
DFP-0
...
</pre>
Take a note of the DFP number, in this example "DFP-0". Your number may vary.
}}

== Extracting EDID binary ==
We use XRandR, grep and xxd to extract the EDID information and generate a binary

{{how-to
|Step1=
<syntaxhighlight lang="bash" enclose="div">
sudo sh -c 'xrandr -display :0.0 --verbose -q | grep -Pzo '"'"'(?<=EDID:)(\s+[0-9a-f]{32})+'"'"' | xxd -r -p > /etc/X11/edid.bin'
sudo chmod 444 /etc/X11/edid.bin
</syntaxhighlight>

|Step2=
Check that the integrity of binary by using parse-edid
<syntaxhighlight lang="bash" enclose="div">
cat /etc/X11/edid.bin | parse-edid | grep -i "checksum"
</syntaxhighlight>
On success you should see a message like the following:
<pre>
Checksum Correct
</pre>
If you don't see this message, or any other message in addition to the above, such as
<pre>I only know about extension blocks of type 02h ...</pre>
or
<pre>Extension block checksum failed</pre>
please examine the output from
<syntaxhighlight lang="bash" enclose="div">
xrandr -display :0.0 --verbose -q
</syntaxhighlight>
manually to try to locate the issue.
}}

== Configure xorg to read from EDID ==
Now edit the xorg.conf you created again

{{how-to
|Step1=
<syntaxhighlight lang="bash" enclose="div">sudo nvidia-xconfig --connected-monitor="DFP-0" --custom-edid="DFP-0:/etc/X11/edid.bin" --use-edid --xconfig=/etc/X11/xorg.conf</syntaxhighlight>

{{redv|Important:|It is VITAL you change the '''DFP-<big>#</big>''' number to match the one we found earlier.}}

If you open your xorg.conf with an text editor/reader, your screen section will look something like the '''example''' below.

<syntaxhighlight lang="xml" enclose="div">
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "NoLogo" "True"
Option "UseEdid" "True"
Option "CustomEDID" "DFP-0:/etc/X11/edid.bin"
Option "ConnectedMonitor" "DFP-0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
</syntaxhighlight>
}}

Since we have created a new xorg.conf file in a location the OS knows to use as default, no further changes need made to make this permanent. If at a later date you need to undo this work simple rename the config file and reboot to revert to default.

If all has went to plan when you reboot everything will just work and the order of powering equipment up will not matter anymore.

{{note|If your equipment is coupled to a receiver that has broader HDMI capabilities than your TV, you should edit your xorg.conf so that the '''section "Screen"''' looks like this:}}<br />

<syntaxhighlight lang="xml" enclose="div">
Section "Screen"
Identifier "screen"
Device "nvidia"
DefaultDepth 24
Option "ColorRange" "Full"
Option "ColorSpace" "RGB"
SubSection "Display"
Depth 24
EndSubSection
EndSection
</syntaxhighlight>

== EDID Library ==

The edid library is intended to be a collection of user generated edid.bin for equipment such as TV's or AVR's in case users want to test or modify or share with others existing edid's.
This section is a WIP and will need to be improved on by users.

Use the '''Legend''' below as a guide to fill in new entries onto the '''edid.bin''' table.

{| class="prettytable" style="text-align: center"
! colspan="5" | '''Legend'''
|-
| {{yes}}
| {{no}}
| {{NA}}
| {{?}}
| Other
|-
| <nowiki>{{yes}}</nowiki>
| <nowiki>{{no}}</nowiki>
| <nowiki>{{NA}}</nowiki>
| <nowiki>{{?}}</nowiki>
| Other
|}

{{redv|Warning:|Make sure you have a backup of your current installation before using any '''edid.bin''' below. Verify download integrity via MD5 checksum.}}

Below is an area that the general community can share their '''edid.bin''' and relevant information with other users.
<br />'''<big>Feel free to update and share your experience below.</big>'''<br />

{| class="prettytable" style="text-align: center"
! style="background: #DBDBDB; width: 100px" | '''TV Brand'''
! style="background: #DBDBDB; width: 100px" | '''AVR Brand'''
! style="background: #DBDBDB; width: 100px" | '''Model'''
! style="background: #DBDBDB; width: 150px" | '''GPU Brand/Model'''
! style="background: #DBDBDB; width: 100px" | '''Working'''
! style="background: #DBDBDB; width: 200px" | '''Download link'''
! style="background: #DBDBDB; width: 150px" colspan="2" | '''Download contents'''
|-
| Samsung
| {{NA}}
| Series 5
| Nvidia ION
| {{yes}}
| [https://dl.dropboxusercontent.com/u/4325533/edid.zip Download edid.zip]
| edid.bin || edid.md5
|-
| {{?}}
| {{?}}
| {{?}}
| {{?}}
| {{?}}
| [http://placeholder-download.com Download edid.bin]
| {{?}} || {{?}}
|}

{{note|Recommended you would create a md5 checksum of the edid.bin and compress both so it can be checked for integrity on download.}}

== Credits ==
The edid instructions are adapted from the Openelec wiki, credit to original authors<ref>[http://wiki.openelec.tv/index.php?title=Config_EDID_nvidia Config EDID NVidia]</ref>

== References ==
<references/>

User:Niklas Holm/sandbox1 - Revision history

Karellen at 01:05, 22 July 2020

Niklas Holm: work in progress