<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> </head> <body> 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 <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> [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> <div class="moz-cite-prefix">On 3/4/21 9:36 AM, Greene, Paul J. wrote: </div> <blockquote type="cite" cite="mid:B9B44AC60C44414CB3A66B338A6F34C9403AD4AE@Z11SVRMAIL02.rivers.zai.com"> <meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style>@font-face {font-family:Wingdings; panose-1:5 0 0 0 0 0 0 0 0 0;}@font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;}@font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Calibri",sans-serif;}a:link, span.MsoHyperlink {mso-style-priority:99; color:#0563C1; text-decoration:underline;}a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:#954F72; text-decoration:underline;}pre {mso-style-priority:99; mso-style-link:"HTML Preformatted Char"; margin:0in; margin-bottom:.0001pt; font-size:10.0pt; font-family:"Courier New";}span.EmailStyle17 {mso-style-type:personal-compose; font-family:"Calibri",sans-serif; color:windowtext;}span.HTMLPreformattedChar {mso-style-name:"HTML Preformatted Char"; mso-style-priority:99; mso-style-link:"HTML Preformatted"; font-family:"Courier New";}.MsoChpDefault {mso-style-type:export-only; font-family:"Calibri",sans-serif;}div.WordSection1 {page:WordSection1;}</style> <div class="WordSection1"> Hello,<o:p></o:p> <o:p> </o:p> First post on this list – don’t be too hard on me. J<o:p></o:p> <o:p> </o:p> 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 3rd monitor connected directly to the PC.<o:p></o:p> <o:p> </o:p> 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> <o:p> </o:p> The video card (in most cases) is an NVIDIA 620 with the NVIDIA driver installed.<o:p></o:p> <o:p> </o:p> 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> <o:p> </o:p> Option "ConnectedMonitor" "DFP-0"<o:p></o:p> Option "CustomEDID" "DFP-0:/etc/X11/edid.bin"<o:p></o:p> Option "IgnoreEDID" "false"<o:p></o:p> Option "UseEDID" "true"<o:p></o:p> <o:p> </o:p> </div> </blockquote> 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 "<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: 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: <a class="moz-txt-link-freetext" href="https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html">https://download.nvidia.com/XFree86/Linux-x86_64/460.56/README/xconfigoptions.html</a> You shouldn't need the IgnoreEDID or UseEDID options. <blockquote type="cite" cite="mid:B9B44AC60C44414CB3A66B338A6F34C9403AD4AE@Z11SVRMAIL02.rivers.zai.com"> <div class="WordSection1"> 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 2nd line.<o:p></o:p> <o:p> </o:p> 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> <o:p> </o:p> 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> <o:p> </o:p> </div> </blockquote> Options in xorg.conf don't combine when you have more than one of the same option in a section. -- Aaron <blockquote type="cite" cite="mid:B9B44AC60C44414CB3A66B338A6F34C9403AD4AE@Z11SVRMAIL02.rivers.zai.com"> <div class="WordSection1"> The PCs are Dell Optiplex 9020s, if that’s relevant.<o:p></o:p> <o:p> </o:p> Any suggestions? Am I on the right track here or should I be trying something else?<o:p></o:p> <o:p> </o:p> PG<o:p></o:p> </div> <hr> This message is intended only for the use of the individual or entity to which it is addressed and may contain ZETA Associates confidential or proprietary information. 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