Unable to disable KERNEL_EXEC_TIMEOUT on idle card on Ubuntu 20.04 with CUDA 11 Update 1

Developer Tools CUDA Developer Tools
1

Hello,

I own two GTX 970 on my system, one for rendering my desktop and one for CUDA computing (they are NOT in SLI mode).

After updating my OS to Ubuntu 20.04 and CUDA 11, I find myself unable to work for this really odd reason:
I am able to deactivate the kernel watchdog on the GPU that renders my desktop but I am NOT able to deactivate it for the GPU that is not rendering nothing at all, no matter what I write on /etc/X11/xorg.config

Even if I switch the display port cable between the two GPUs, the KERNEL_EXEC_TIMEOUT switches as well!

I tried setting the “interactive” option to zero and to false both for only one GPU or to both of them, specifying every time the PCI bus they are connected to, but the situation is always the same: I can only control the KERNEL_EXEC_TIMEOUT attribute to the GPU that is connected via display port to my sceen, and the other has it always on, no matter what I do.

What can I do? This thing is making my entire configuration useless…

I will attach here the debug file obtained with nvidia-bug-report.sh, and my actual configuration in xorg.config

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 450.51.06


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

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    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"
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 970"
    BusID          "PCI:1:0:0"
    Option         "Interactive" "0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 970"
    BusID          "PCI:2:0:0"
    Option         "Interactive" "0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Interactive" "0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

nvidia-bug-report.log.gz (1009.7 KB)

Thank you for your time and support!