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 [email protected] <mailto:[email protected]>
[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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