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List: freedesktop-xorg
Subject: Re: xorg.conf question
From: Aaron Plattner <aplattner () nvidia ! com>
Date: 2021-03-05 6:07:00
Message-ID: accd9d71-d65a-38de-e424-9a9b1c86ab4a () nvidia ! com
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These are NVIDIA-specific options so they're kinda offtopic here, but
I'll try to address them below.
You might want to consider posting on the NVIDIA forum
<https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/148> [1]
or by emailing linux-bugs@nvidia.com <mailto:linux-bugs@nvidia.com>
[1] https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/148
On 3/4/21 9:36 AM, Greene, Paul J. wrote:
>
> Hello,
>
> First post on this list – don’t be too hard on me. J
>
> I support a bunch of software developers that use a KVM to switch back
> and forth between a Windows workstation and a CentOS 7.9 workstation.
> The Windows side has dual monitors, both going through the KVM, and
> the Linux side has 3 monitors – two monitors going through the KVM and
> the 3^rd monitor connected directly to the PC.
>
> In some cases, when they switch back and forth between the Windows PC
> and the Linux PC, the Linux PC loses its video resolution or 1 or more
> screens goes black. I’m assuming the video loses its sync with the
> monitor. To get out of this state, the user usually does a
> CTRL-ALT-BACKSPACE to restart X, or they go to CTRL-ALT-F2, login from
> the command prompt, and type “startx”. In both cases they lose any
> unsaved work they’ve got open.
>
> The video card (in most cases) is an NVIDIA 620 with the NVIDIA driver
> installed.
>
> I’ve tried adding the following 4 lines to xorg.conf in the device
> section, and it seems to make only the left most monitor stable, but
> the other 2 monitors appear to be disabled, with black screens.
>
> Option "ConnectedMonitor" "DFP-0"
>
> Option "CustomEDID" "DFP-0:/etc/X11/edid.bin"
>
> Option "IgnoreEDID" "false"
>
> Option "UseEDID" "true"
>
If there's only one GPU in the system then you only need one Device
section. It's likely that the other two device sections are ignored.
("Device" here refers to a GPU, not a physical display device).
The "ConnectedMonitor
<https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html#ConnectedMonitor>"
option takes a comma-separated list of display devices that the driver
should always consider connected. "CustomEDID
<https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html#CustomEDID>"
uses a semicolon-separated list. So in your case you probably want this:
Option "ConnectedMonitor" "DP-0, DP-2, DP-6"
Option "CustomEDID" "DP-0:/path/to/edid0.bin; DP-2:/path/to/edid1.bin;
DP-6:/path/to/edid2.bin"
These options are documented in the README:
https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html
You shouldn't need the IgnoreEDID or UseEDID options.
> The system sees the 3 monitors as DP-2, DP-0, and DP-6 (respectively,
> from left to right). The NVIDIA driver includes a GUI configuration
> app that lets you generate the EDID files on each of the monitors, so
> I created an edid.bin file for each monitor, and adjusted the file
> path for each one in the 2^nd line.
>
> There’s 3 device sections so I put the 4 lines above into each section
> (adjusting for edid.bin path and DP-x reference appropriately). That
> gave me one useable screen (the left one) – the middle and right
> monitor were black screens.
>
> I tried putting the 4 lines all in one “Device” section, with the
> appropriate DP-x and edid.bin path, (total of 8 lines) and got the
> same result.
>
>
Options in xorg.conf don't combine when you have more than one of the
same option in a section.
-- Aaron
> The PCs are Dell Optiplex 9020s, if that’s relevant.
>
> Any suggestions? Am I on the right track here or should I be trying
> something else?
>
> PG
>
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<p>These are NVIDIA-specific options so they're kinda offtopic here,
but I'll try to address them below.</p>
<p>You might want to consider posting on the <a
moz-do-not-send="true"
href="https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/148">NVIDIA
forum</a> [1] or by emailing <a moz-do-not-send="true"
href="mailto:linux-bugs@nvidia.com">linux-bugs@nvidia.com</a><br>
</p>
<p>[1]
<a class="moz-txt-link-freetext" \
href="https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/148">https://forums.developer.nvidia.com/c/gpu-unix-graphics/linux/148</a><br>
</p>
<div class="moz-cite-prefix">On 3/4/21 9:36 AM, Greene, Paul J.
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:B9B44AC60C44414CB3A66B338A6F34C9403AD4AE@Z11SVRMAIL02.rivers.zai.com">
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<div class="WordSection1">
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First post on this list – don’t be too hard
on me. <span style="font-family:Wingdings">
J</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I support a bunch of software developers
that use a KVM to switch back and forth between a Windows
workstation and a CentOS 7.9 workstation. The Windows side has
dual monitors, both going through the KVM, and the Linux side
has 3 monitors – two monitors going through the KVM and the 3<sup>rd</sup>
monitor connected directly to the PC.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In some cases, when they switch back and
forth between the Windows PC and the Linux PC, the Linux PC
loses its video resolution or 1 or more screens goes black.
I’m assuming the video loses its sync with the monitor. To get
out of this state, the user usually does a CTRL-ALT-BACKSPACE
to restart X, or they go to CTRL-ALT-F2, login from the
command prompt, and type “startx”. In both cases they lose any
unsaved work they’ve got open.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The video card (in most cases) is an NVIDIA
620 with the NVIDIA driver installed.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve tried adding the following 4 lines to
xorg.conf in the device section, and it seems to make only the
left most monitor stable, but the other 2 monitors appear to
be disabled, with black screens.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier New"">
Option "ConnectedMonitor" "DFP-0"<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier New"">
Option "CustomEDID" \
"DFP-0:/etc/X11/edid.bin"<o:p></o:p></span></p> <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier New"">
Option "IgnoreEDID" "false"<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier New"">
Option "UseEDID" "true"<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</blockquote>
<p>If there's only one GPU in the system then you only need one
Device section. It's likely that the other two device sections are
ignored. ("Device" here refers to a GPU, not a physical display
device).</p>
<p>The "<a moz-do-not-send="true"
href="https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html#ConnectedMonitor">ConnectedMonitor</a>"
option takes a comma-separated list of display devices that the
driver should always consider connected. "<a
moz-do-not-send="true"
href="https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html#CustomEDID">CustomEDID</a>"
uses a semicolon-separated list. So in your case you probably want
this:</p>
<p><font face="monospace">Option "ConnectedMonitor" "DP-0, DP-2,
DP-6"<br>
Option "CustomEDID" "DP-0:/path/to/edid0.bin;
DP-2:/path/to/edid1.bin; DP-6:/path/to/edid2.bin"</font></p>
<p>These options are documented in the README:
<a class="moz-txt-link-freetext" \
href="https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.ht \
ml">https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html</a></p>
<p>You shouldn't need the IgnoreEDID or UseEDID options.<br>
</p>
<blockquote type="cite"
cite="mid:B9B44AC60C44414CB3A66B338A6F34C9403AD4AE@Z11SVRMAIL02.rivers.zai.com">
<div class="WordSection1">
<p class="MsoNormal">The system sees the 3 monitors as DP-2,
DP-0, and DP-6 (respectively, from left to right). The NVIDIA
driver includes a GUI configuration app that lets you generate
the EDID files on each of the monitors, so I created an
edid.bin file for each monitor, and adjusted the file path for
each one in the 2<sup>nd</sup> line.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There’s 3 device sections so I put the 4
lines above into each section (adjusting for edid.bin path and
DP-x reference appropriately). That gave me one useable screen
(the left one) – the middle and right monitor were black
screens.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried putting the 4 lines all in one
“Device” section, with the appropriate DP-x and edid.bin path,
(total of 8 lines) and got the same result.<o:p></o:p></p>
<p class="MsoNormal"><o:p><br>
</o:p></p>
</div>
</blockquote>
<p>Options in xorg.conf don't combine when you have more than one of
the same option in a section.<br>
</p>
<p>-- Aaron<br>
</p>
<blockquote type="cite"
cite="mid:B9B44AC60C44414CB3A66B338A6F34C9403AD4AE@Z11SVRMAIL02.rivers.zai.com">
<div class="WordSection1">
<p class="MsoNormal">The PCs are Dell Optiplex 9020s, if that’s
relevant.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any suggestions? Am I on the right track
here or should I be trying something else?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">PG<o:p></o:p></p>
</div>
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