On the Jetson Nano Dev Kit I am using an xorg.conf that puts the HDMI output on screen 0 and the DP output on screen 1:
# cat /etc/X11/xorg.conf
# Copyright (c) 2011-2015 NVIDIA CORPORATION. All Rights Reserved.
#
# This is the minimal configuration necessary to use the Tegra driver.
# Please refer to the xorg.conf man page for more configuration
# options provided by the X server, including display-related options
# provided by RandR 1.2 and higher.
# Disable extensions not useful on Tegra.
Section "Module"
Disable "dri"
SubSection "extmod"
Option "omit xfree86-dga"
EndSubSection
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
Screen 0
Option "UseDisplayDevice" "HDMI-0"
Option "AllowEmptyInitialConfiguration" "true"
Option "AddARGBGLXVisuals" "true"
Option "ConnectToAcpid" "false"
Option "TegraReserveDisplayBandwidth" "false"
EndSection
Section "Device"
Identifier "Device1"
Driver "nvidia"
Screen 1
Option "UseDisplayDevice" "DP-0"
Option "AllowEmptyInitialConfiguration" "true"
Option "AddARGBGLXVisuals" "true"
Option "ConnectToAcpid" "false"
Option "TegraReserveDisplayBandwidth" "false"
EndSection
Section "Monitor"
Identifier "Monitor0"
HorizSync 18.0 - 99.0
VertRefresh 23.0 - 62.0
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
EndSection
Section "Monitor"
Identifier "Monitor1"
HorizSync 18.0 - 99.0
VertRefresh 23.0 - 62.0
EndSection
Section "Screen"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
EndSection
Section "ServerLayout"
Identifier "ServerLayout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" 0 0
Option "Xinerama" "0"
EndSection
This works fine if both monitors are connected when booted.
# DISPLAY=:0.0 xrandr
Screen 0: minimum 8 x 8, current 4096 x 2160, maximum 16384 x 16384
HDMI-0 connected primary 4096x2160+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1920x1080 60.00 + 59.95 50.00 30.00 29.97 25.00 24.00 23.98
4096x2160 60.02 59.98 50.01 30.00* 29.97 25.00 24.00 23.98
3840x2160 60.02 59.98 50.01 30.00 29.97 25.00 24.00 23.98
1680x1050 59.96
1600x1200 60.01
1600x900 60.00
1440x900 59.89
1280x1024 60.00
1280x800 59.81
1280x720 60.00 59.94 50.00
1024x768 60.01
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.94 59.94
# DISPLAY=:0.1 xrandr
Screen 1: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DP-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 480mm x 270mm
1920x1080 60.00*+
1600x900 60.00
1280x1024 75.03 60.00
1152x864 75.00
1024x768 75.03 60.01
800x600 75.00 60.32
720x400 70.04
640x480 75.00 59.94
Disconnecting either monitor at this point works as expected.
Disconnecting just the DP monitor gives:
# DISPLAY=:0.0 xrandr
Screen 0: minimum 8 x 8, current 4096 x 2160, maximum 16384 x 16384
HDMI-0 connected primary 4096x2160+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1920x1080 60.00 + 59.95 50.00 30.00 29.97 25.00 24.00 23.98
4096x2160 60.02 59.98 50.01 30.00* 29.97 25.00 24.00 23.98
3840x2160 60.02 59.98 50.01 30.00 29.97 25.00 24.00 23.98
1680x1050 59.96
1600x1200 60.01
1600x900 60.00
1440x900 59.89
1280x1024 60.00
1280x800 59.81
1280x720 60.00 59.94 50.00
1024x768 60.01
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.94 59.94
# DISPLAY=:0.1 xrandr
Screen 1: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DP-0 disconnected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1920x1080 (0x18c) 148.500MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
Disconnecting just the HDMI monitor gives:
# DISPLAY=:0.0 xrandr
Screen 0: minimum 8 x 8, current 4096 x 2160, maximum 16384 x 16384
HDMI-0 disconnected primary 4096x2160+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
4096x2160 (0x190) 297.000MHz +HSync +VSync
h: width 4096 start 4184 end 4272 total 4400 skew 0 clock 67.50KHz
v: height 2160 start 2168 end 2178 total 2250 clock 30.00Hz
# DISPLAY=:0.1 xrandr
Screen 1: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DP-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 480mm x 270mm
1920x1080 60.00*+
1600x900 60.00
1280x1024 75.03 60.00
1152x864 75.00
1024x768 75.03 60.01
800x600 75.00 60.32
720x400 70.04
640x480 75.00 59.94
If the HDMI monitor is connected at boot but the DP is not I get both the HDMI and the DP monitor on screen 0 which is not correct:
# DISPLAY=:0.0 xrandr
Screen 0: minimum 8 x 8, current 4096 x 2160, maximum 16384 x 16384
HDMI-0 connected primary 4096x2160+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1920x1080 60.00 + 59.95 50.00 30.00 29.97 25.00 24.00 23.98
4096x2160 60.02 59.98 50.01 30.00* 29.97 25.00 24.00 23.98
3840x2160 60.02 59.98 50.01 30.00 29.97 25.00 24.00 23.98
1680x1050 59.96
1600x1200 60.01
1600x900 60.00
1440x900 59.89
1280x1024 60.00
1280x800 59.81
1280x720 60.00 59.94 50.00
1024x768 60.01
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.94 59.94
DP-0 disconnected (normal left inverted right x axis y axis)
# DISPLAY=:0.1 xrandr
Can't open display :0.1
The /var/log/Xorg.0.log contains:
# cat /var/log/Xorg.0.log
[2103467.122]
X.Org X Server 1.18.4
Release Date: 2016-07-19
[2103467.122] X Protocol Version 11, Revision 0
[2103467.122] Build Operating System: Linux 4.15.0-109-generic x86_64
[2103467.123] Current Operating System: Linux ShareLink-Pro-Jetson-Nano-DK-E6-CC-A7 4.9.140 #1.05.0000-b013-dev SMP PREEMPT Wed Jul 22 09:14:14 EDT 2020 aarch64
[2103467.123] Kernel command line: tegraid=21.1.2.0.0 ddr_die=4096M@2048M section=512M memtype=0 vpr_resize usb_port_owner_info=0 lane_owner_info=0 emc_max_dvfs=0 touch_id=0@63 video=tegrafb no_console_suspend=1 console=ttyS0,115200n8 debug_uartport=lsport,2 earlyprintk=uart8250-32bit,0x70006000 maxcpus=4 usbcore.old_scheme_first=1 lp0_vec=0x1000@0xff780000 core_edp_mv=1075 core_edp_ma=4000 tegra_fbmem=0x800000@0x92cb4000 is_hdmi_initialised=1 ip=192.168.0.226:192.168.0.220:192.168.0.1:255.255.0.0::eth0:off nfsroot=192.168.0.220:/tftpboot/nano_rootfs,nfsvers=3 root=/dev/nfs rw netdevwait net.ifnames=0
[2103467.123] Build Date: 22 July 2020 08:17:56AM
[2103467.123]
[2103467.123] Current version of pixman: 0.38.4
[2103467.123] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[2103467.123] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[2103467.124] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Jul 23 20:32:13 2020
[2103467.127] (==) Using config file: "/etc/X11/xorg.conf"
[2103467.127] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[2103467.127] (==) ServerLayout "ServerLayout0"
[2103467.127] (**) |-->Screen "Screen0" (0)
[2103467.127] (**) | |-->Monitor "Monitor0"
[2103467.127] (**) | |-->Device "Device0"
[2103467.127] (**) |-->Screen "Screen1" (1)
[2103467.127] (**) | |-->Monitor "Monitor1"
[2103467.127] (**) | |-->Device "Device1"
[2103467.128] (**) Option "Xinerama" "0"
[2103467.128] (==) Automatically adding devices
[2103467.128] (==) Automatically enabling devices
[2103467.128] (==) Automatically adding GPU devices
[2103467.128] (==) Max clients allowed: 256, resource mask: 0x1fffff
[2103467.128] (WW) The directory "/usr/share/fonts/X11//TTF/" does not exist.
[2103467.128] Entry deleted from font path.
[2103467.128] (WW) The directory "/usr/share/fonts/X11//OTF/" does not exist.
[2103467.128] Entry deleted from font path.
[2103467.129] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/X11//100dpi/".
[2103467.129] Entry deleted from font path.
[2103467.129] (Run 'mkfontdir' on "/usr/share/fonts/X11//100dpi/").
[2103467.130] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/X11//75dpi/".
[2103467.130] Entry deleted from font path.
[2103467.130] (Run 'mkfontdir' on "/usr/share/fonts/X11//75dpi/").
[2103467.130] (==) FontPath set to:
/usr/share/fonts/X11//misc/,
/usr/share/fonts/X11//Type1/
[2103467.130] (==) ModulePath set to "/usr/lib/xorg/modules"
[2103467.130] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[2103467.130] (II) Loader magic: 0x5ceab8
[2103467.130] (II) Module ABI versions:
[2103467.130] X.Org ANSI C Emulation: 0.4
[2103467.130] X.Org Video Driver: 20.0
[2103467.130] X.Org XInput driver : 22.1
[2103467.130] X.Org Server Extension : 9.0
[2103467.131] (II) no primary bus or device found
[2103467.131] (WW) "dri" will not be loaded unless you've specified it to be loaded elsewhere.
[2103467.131] (II) LoadModule: "extmod"
[2103467.131] (II) Module "extmod" already built-in
[2103467.131] (II) LoadModule: "nvidia"
[2103467.134] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[2103467.137] (II) Module nvidia: vendor="NVIDIA Corporation"
[2103467.137] compiled for 4.0.2, module version = 1.0.0
[2103467.137] Module class: X.Org Video Driver
[2103467.137] (II) NVIDIA dlloader X Driver 32.4.2 Release Build (integ_stage_rel) (buildbrain@mobile-u64-4164) Wed Apr 8 18:12:28 PDT 2020
[2103467.137] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[2103467.139] (--) using VT number 2
[2103467.149] (WW) Falling back to old probe method for NVIDIA
[2103467.149] (II) Loading sub module "fb"
[2103467.149] (II) LoadModule: "fb"
[2103467.150] (II) Loading /usr/lib/xorg/modules/libfb.so
[2103467.152] (II) Module fb: vendor="X.Org Foundation"
[2103467.152] compiled for 1.18.4, module version = 1.0.0
[2103467.152] ABI class: X.Org ANSI C Emulation, version 0.4
[2103467.152] (II) Loading sub module "wfb"
[2103467.152] (II) LoadModule: "wfb"
[2103467.153] (II) Loading /usr/lib/xorg/modules/libwfb.so
[2103467.154] (II) Module wfb: vendor="X.Org Foundation"
[2103467.154] compiled for 1.18.4, module version = 1.0.0
[2103467.154] ABI class: X.Org ANSI C Emulation, version 0.4
[2103467.155] (II) Loading sub module "ramdac"
[2103467.155] (II) LoadModule: "ramdac"
[2103467.155] (II) Module "ramdac" already built-in
[2103467.156] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[2103467.156] (II) NVIDIA(0): Creating default Display subsection in Screen section
"Screen0" for depth/fbbpp 24/32
[2103467.156] (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
[2103467.156] (==) NVIDIA(0): RGB weight 888
[2103467.156] (==) NVIDIA(0): Default visual is TrueColor
[2103467.156] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[2103467.156] (**) NVIDIA(0): Option "AddARGBGLXVisuals" "true"
[2103467.156] (**) NVIDIA(0): Option "ConnectToAcpid" "false"
[2103467.156] (**) NVIDIA(0): Option "AllowEmptyInitialConfiguration" "true"
[2103467.156] (**) NVIDIA(0): Option "UseDisplayDevice" "HDMI-0"
[2103467.156] (**) NVIDIA(0): Option "TegraReserveDisplayBandwidth" "false"
[2103467.156] (II) NVIDIA(1): Creating default Display subsection in Screen section
"Screen1" for depth/fbbpp 24/32
[2103467.156] (**) NVIDIA(1): Option "UseDisplayDevice" "DP-0"
[2103467.156] (**) NVIDIA(1): Option "TegraReserveDisplayBandwidth" "false"
[2103467.156] (**) NVIDIA(0): Enabling 2D acceleration
[2103467.156] (II) Loading sub module "glxserver_nvidia"
[2103467.156] (II) LoadModule: "glxserver_nvidia"
[2103467.159] (II) Loading /usr/lib/xorg/modules/extensions/libglxserver_nvidia.so
[2103467.167] (II) Module glxserver_nvidia: vendor="NVIDIA Corporation"
[2103467.167] compiled for 4.0.2, module version = 1.0.0
[2103467.167] Module class: X.Org Server Extension
[2103467.167] (II) NVIDIA GLX Module 32.4.2 Release Build (integ_stage_rel) (buildbrain@mobile-u64-4164) Wed Apr 8 18:10:45 PDT 2020
[2103467.169] (--) NVIDIA(0): Valid display device(s) on GPU-0 at SoC
[2103467.169] (--) NVIDIA(0): DFP-0
[2103467.169] (--) NVIDIA(0): DFP-1
[2103467.169] (II) NVIDIA(0): NVIDIA GPU NVIDIA Tegra X1 (nvgpu) (GM20B) at SoC (GPU-0)
[2103467.169] (--) NVIDIA(0): Memory: 4051152 kBytes
[2103467.169] (--) NVIDIA(0): VideoBIOS:
[2103467.169] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103467.169] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
[2103467.170] (==) NVIDIA(0):
[2103467.170] (==) NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
[2103467.170] (==) NVIDIA(0): will be used as the requested mode.
[2103467.170] (==) NVIDIA(0):
[2103467.170] (II) NVIDIA(0): Validated MetaModes:
[2103467.170] (II) NVIDIA(0): "DFP-0:nvidia-auto-select"
[2103467.170] (II) NVIDIA(0): Virtual screen size determined to be 1920 x 1080
[2103467.173] (WW) NVIDIA(0): EXN ExtronScalerD (DFP-0) does not have an EDID, or its EDID
[2103467.173] (WW) NVIDIA(0): does not contain a maximum image size; cannot compute DPI
[2103467.173] (WW) NVIDIA(0): from EXN ExtronScalerD (DFP-0)'s EDID.
[2103467.173] (==) NVIDIA(0): DPI set to (75, 75); computed from built-in default
[2103467.173] (**) NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
[2103467.173] (==) NVIDIA(1): Depth 24, (==) framebuffer bpp 32
[2103467.173] (==) NVIDIA(1): RGB weight 888
[2103467.173] (==) NVIDIA(1): Default visual is TrueColor
[2103467.173] (==) NVIDIA(1): Using gamma correction (1.0, 1.0, 1.0)
[2103467.173] (**) NVIDIA(1): Option "AddARGBGLXVisuals" "true"
[2103467.173] (**) NVIDIA(1): Option "ConnectToAcpid" "false"
[2103467.173] (**) NVIDIA(1): Option "AllowEmptyInitialConfiguration" "true"
[2103467.173] (II) NVIDIA(1): NVIDIA GPU NVIDIA Tegra X1 (nvgpu) (GM20B) at SoC (GPU-0)
[2103467.173] (--) NVIDIA(1): Memory: 4051152 kBytes
[2103467.173] (--) NVIDIA(1): VideoBIOS:
[2103467.173] (EE) NVIDIA(1): Failed to assign any heads to X screen 1
[2103467.173] (EE) NVIDIA(1): Failing initialization of X screen 1
[2103467.173] (II) UnloadModule: "nvidia"
[2103467.173] (II) UnloadSubModule: "wfb"
[2103467.173] (II) UnloadSubModule: "fb"
[2103467.173] (--) Depth 24 pixmap format is 32 bpp
[2103467.174] (II) NVIDIA: Reserving 6144.00 MB of virtual memory for indirect memory
[2103467.174] (II) NVIDIA: access.
[2103467.175] (EE) NVIDIA(0): Failed to allocate NVIDIA Error Handler
[2103467.229] (II) NVIDIA(0): Setting mode "DFP-0:nvidia-auto-select"
[2103467.343] (==) NVIDIA(0): Disabling shared memory pixmaps
[2103467.343] (==) NVIDIA(0): Backing store enabled
[2103467.343] (==) NVIDIA(0): Silken mouse enabled
[2103467.345] (==) NVIDIA(0): DPMS enabled
[2103467.346] (II) Loading sub module "dri2"
[2103467.346] (II) LoadModule: "dri2"
[2103467.346] (II) Module "dri2" already built-in
[2103467.346] (II) NVIDIA(0): [DRI2] Setup complete
[2103467.346] (II) NVIDIA(0): [DRI2] VDPAU driver: nvidia
[2103467.363] (--) RandR disabled
[2103467.363] (II) Initializing extension GLX
[2103467.364] (II) Indirect GLX disabled.
[2103467.472] (II) config/udev: Adding input device tegra-hda HDMI/DP,pcm=3 (/dev/input/event0)
[2103467.472] (II) No input driver specified, ignoring this device.
[2103467.472] (II) This device may have been added with another device file.
[2103467.473] (II) config/udev: Adding input device DELL DELL USB Keyboard (/dev/input/event2)
[2103467.473] (**) DELL DELL USB Keyboard: Applying InputClass "evdev keyboard catchall"
[2103467.473] (II) LoadModule: "evdev"
[2103467.475] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
[2103467.478] (II) Module evdev: vendor="X.Org Foundation"
[2103467.478] compiled for 1.18.4, module version = 2.10.6
[2103467.478] Module class: X.Org XInput Driver
[2103467.478] ABI class: X.Org XInput driver, version 22.1
[2103467.478] (II) Using input driver 'evdev' for 'DELL DELL USB Keyboard'
[2103467.479] (**) DELL DELL USB Keyboard: always reports core events
[2103467.479] (**) evdev: DELL DELL USB Keyboard: Device: "/dev/input/event2"
[2103467.479] (--) evdev: DELL DELL USB Keyboard: Vendor 0x413c Product 0x2005
[2103467.479] (--) evdev: DELL DELL USB Keyboard: Found keys
[2103467.479] (II) evdev: DELL DELL USB Keyboard: Configuring as keyboard
[2103467.479] (**) Option "config_info" "udev:/sys/devices/70090000.xusb/usb1/1-2/1-2.1/1-2.1:1.0/0003:413C:2005.0001/input/input2/event2"
[2103467.479] (II) XINPUT: Adding extended input device "DELL DELL USB Keyboard" (type: KEYBOARD, id 6)
[2103467.479] (**) Option "xkb_rules" "evdev"
[2103467.481] (II) config/udev: Adding input device HID 413c:3010 (/dev/input/event3)
[2103467.481] (**) HID 413c:3010: Applying InputClass "evdev pointer catchall"
[2103467.481] (II) Using input driver 'evdev' for 'HID 413c:3010'
[2103467.481] (**) HID 413c:3010: always reports core events
[2103467.481] (**) evdev: HID 413c:3010: Device: "/dev/input/event3"
[2103467.539] (--) evdev: HID 413c:3010: Vendor 0x413c Product 0x3010
[2103467.539] (--) evdev: HID 413c:3010: Found 3 mouse buttons
[2103467.539] (--) evdev: HID 413c:3010: Found scroll wheel(s)
[2103467.539] (--) evdev: HID 413c:3010: Found relative axes
[2103467.539] (--) evdev: HID 413c:3010: Found x and y relative axes
[2103467.539] (II) evdev: HID 413c:3010: Configuring as mouse
[2103467.539] (II) evdev: HID 413c:3010: Adding scrollwheel support
[2103467.539] (**) evdev: HID 413c:3010: YAxisMapping: buttons 4 and 5
[2103467.539] (**) evdev: HID 413c:3010: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[2103467.539] (**) Option "config_info" "udev:/sys/devices/70090000.xusb/usb1/1-2/1-2.3/1-2.3:1.0/0003:413C:3010.0002/input/input3/event3"
[2103467.539] (II) XINPUT: Adding extended input device "HID 413c:3010" (type: MOUSE, id 7)
[2103467.539] (II) evdev: HID 413c:3010: initialized for relative axes.
[2103467.540] (**) HID 413c:3010: (accel) keeping acceleration scheme 1
[2103467.540] (**) HID 413c:3010: (accel) acceleration profile 0
[2103467.540] (**) HID 413c:3010: (accel) acceleration factor: 2.000
[2103467.540] (**) HID 413c:3010: (accel) acceleration threshold: 4
[2103467.541] (II) config/udev: Adding input device HID 413c:3010 (/dev/input/mouse0)
[2103467.541] (II) No input driver specified, ignoring this device.
[2103467.541] (II) This device may have been added with another device file.
[2103467.542] (II) config/udev: Adding input device gpio-keys (/dev/input/event1)
[2103467.542] (**) gpio-keys: Applying InputClass "evdev keyboard catchall"
[2103467.542] (II) Using input driver 'evdev' for 'gpio-keys'
[2103467.542] (**) gpio-keys: always reports core events
[2103467.542] (**) evdev: gpio-keys: Device: "/dev/input/event1"
[2103467.542] (--) evdev: gpio-keys: Vendor 0x1 Product 0x1
[2103467.542] (--) evdev: gpio-keys: Found keys
[2103467.542] (II) evdev: gpio-keys: Configuring as keyboard
[2103467.542] (**) Option "config_info" "udev:/sys/devices/gpio-keys/input/input1/event1"
[2103467.542] (II) XINPUT: Adding extended input device "gpio-keys" (type: KEYBOARD, id 8)
[2103467.542] (**) Option "xkb_rules" "evdev"
[2103467.978] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103467.978] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
[2103467.999] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103467.999] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
[2103469.098] (II) NVIDIA(0): Setting mode "HDMI-0: 4096x2160_30 @4096x2160 +0+0 {ViewPortIn=4096x2160, ViewPortOut=4096x2160+0+0}"
[2103469.359] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103469.359] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
[2103470.404] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103470.404] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
[2103470.487] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103470.487] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
[2103470.612] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): connected
[2103470.612] (--) NVIDIA(GPU-0): EXN ExtronScalerD (DFP-0): External TMDS
The key lines being:
[2103467.173] (EE) NVIDIA(1): Failed to assign any heads to X screen 1
[2103467.173] (EE) NVIDIA(1): Failing initialization of X screen 1