Help: Can not use resolution higher than 640x480 without connecting a monitor

RHEL 7 with GTX 460 but no monitor connected.

lspci | grep -i VGA

01:00.0 VGA compatible controller: NVIDIA Corporation GF104 [GeForce GTX 460] (rev a1)

lspci | grep -i VGA

01:00.0 VGA compatible controller: NVIDIA Corporation GF104 [GeForce GTX 460] (rev a1)

xrandr

Screen 0: minimum 8 x 8, current 640 x 480, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected primary 640x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
640x480 59.94*+
320x240 60.05
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-I-3 disconnected (normal left inverted right x axis y axis)

cat xorg.conf

nvidia-xconfig: X configuration file generated by nvidia-xconfig

nvidia-xconfig: version 390.25 (buildmeister@swio-display-x86-rhel47-03) Wed Jan 24 20:46:04 PST 2018

Section “ServerLayout”
Identifier “Layout0”
Screen 0 “Screen0”
InputDevice “Keyboard0” “CoreKeyboard”
InputDevice “Mouse0” “CorePointer”
EndSection

Section “Files”
FontPath “/usr/share/fonts/default/Type1”
EndSection

Section “InputDevice”
# generated from default
Identifier “Mouse0”
Driver “mouse”
Option “Protocol” “auto”
Option “Device” “/dev/input/mice”
Option “Emulate3Buttons” “no”
Option “ZAxisMapping” “4 5”
EndSection

Section “InputDevice”
# generated from default
Identifier “Keyboard0”
Driver “kbd”
EndSection

Section “Monitor”
Identifier “Monitor0”
VendorName “Unknown”
ModelName “Unknown”
Modeline “1920x1080_60.00” 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option “DPMS”
EndSection

Section “Device”
Identifier “Device0”
Driver “nvidia”
VendorName “NVIDIA Corporation”
BusID “PCI:1:0:0”
EndSection

Section “Screen”
Identifier “Screen0”
Device “Device0”
Monitor “Monitor0”
DefaultDepth 16
SubSection “Display”
Depth 16
Modes “1920x1080_60.00”
EndSubSection
Option “ConnectedMonitor” “DFP”
EndSection

Please run nvidia-bug-report.sh as root and attach the resulting nvidia-bug-report.log.gz file to your post.

nvidia-bug-report.log.gz (103.8 KB)

following the instruction from Managing a Display EDID on Linux | NVIDIA
I was able to get an EDID file from another machine with a monitor and configure the xorg.conf to load it.
The issue is resolved. Thanks

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