root@pve:~# displaymodeselector --gpumode compute 
-bash: displaymodeselector: command not found
root@pve:~# ./displaymodeselector --gpumode compute 

NVIDIA Display Mode Selector Utility (Version 1.59.0)
Copyright (C) 2015-2021, NVIDIA Corporation. All Rights Reserved.


WARNING: This operation updates the firmware on the board and could make
         the device unusable if your host system lacks the necessary support.

Are you sure you want to continue?
Press 'y' to confirm (any other key to abort): 
y
Specifed GPU Mode "physical_display_disabled"


Update GPU Mode of all adapters to "physical_display_disabled"?
Press 'y' to confirm or 'n' to choose adapters or any other key to abort: 
n
Select a display adapter:
<0> Graphics Device      (10DE,26B1,10DE,16A1) S:00,B:0A,D:00,F:00
<1> Graphics Device      (10DE,26B1,10DE,16A1) S:00,B:42,D:00,F:00
<2> GeForce GT 430       (10DE,0DE1,196E,0828) S:00,B:43,D:00,F:00
Select a number (ESC to quit): 
0

Apply GPU Mode <4> corresponds to "physical_display_disabled"

Reading EEPROM (this operation may take up to 30 seconds)

Reading EEPROM (this operation may take up to 30 seconds) 

[==================================================] 100 %
Reading EEPROM (this operation may take up to 30 seconds)

Reading EEPROM (this operation may take up to 30 seconds) 

Successfully updated GPU mode to "physical_display_disabled" ( Mode 4 ).

A reboot is required for the update to take effect.

root@pve:~# ./displaymodeselector --gpumode compute 

NVIDIA Display Mode Selector Utility (Version 1.59.0)
Copyright (C) 2015-2021, NVIDIA Corporation. All Rights Reserved.


WARNING: This operation updates the firmware on the board and could make
         the device unusable if your host system lacks the necessary support.

Are you sure you want to continue?
Press 'y' to confirm (any other key to abort): 
y
Specifed GPU Mode "physical_display_disabled"


Update GPU Mode of all adapters to "physical_display_disabled"?
Press 'y' to confirm or 'n' to choose adapters or any other key to abort: 
n
Select a display adapter:
<0> Graphics Device      (10DE,26B1,10DE,16A1) S:00,B:0A,D:00,F:00
<1> Graphics Device      (10DE,26B1,10DE,16A1) S:00,B:42,D:00,F:00
<2> GeForce GT 430       (10DE,0DE1,196E,0828) S:00,B:43,D:00,F:00
Select a number (ESC to quit): 
1

Apply GPU Mode <4> corresponds to "physical_display_disabled"

Reading EEPROM (this operation may take up to 30 seconds)

Reading EEPROM (this operation may take up to 30 seconds) 

[==================================================] 100 %
Reading EEPROM (this operation may take up to 30 seconds)

Reading EEPROM (this operation may take up to 30 seconds) 

Successfully updated GPU mode to "physical_display_disabled" ( Mode 4 ).

A reboot is required for the update to take effect.

root@pve:~# reboot 
Shared connection to 100.78.119.122 closed.