Second monitor goes black while I see video on Netflix


I run manjaro cinnamon with the last LTS kernel (5.4.) (5.5. gives no sound to my HDMI but that's another problem) and nvidia proprietary drivers.
I have my primary monitor connected with DVI and a second with HDMI. The second is actually a TV. I enable it through the "System settings" --> "Display" when I want to use it. Some times, this screen goes black. At this time the running video progresses and the sound continues normally from the black screen. The screen opens again if I deactivate and reactivate it from the settings. But usually if it gets black, it will be again soon after. I haven't notice a specific time before it happens.
I can't tell when this started, but I didn't experience this problem earlier.

What could be the reason for this? What additional information could I post?

Some TVs have a timer to turn off and some sort of screensaver. Probably is getting activated ...

I don't think so (wouldn't this close the sound also?). I searched the settings of the TV and I didn't fount something that without sleep it so fast. And if I press something in the TV remote souldn't this awake it? I opened the menu and closed it, I could see the TV menus, but the rest of the screen remained black.

Oh, i see ... hmmm.
Can i have a look at /etc/X11/mhwd.d/nvidia.conf ?
Also, did you try on a new TEST user and see if there does the same thing?

This is the file (with the second monitor enabled)

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 440.64

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

Section "Files"

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
	Option "NoLogo" "1"

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24

Section "Extensions"
    Option         "COMPOSITE" "Enable"

Section "InputClass"
    Identifier          "Keyboard Defaults"
    MatchIsKeyboard        "yes"
    Option              "XkbOptions" "terminate:ctrl_alt_bksp"

Also, as I just tested, the problem seems to not exist in windows on the same machine. I will test the new user as soon as possible.

The config is the default one, and should work as is, but, maybe you have to tweak it.
Comment out this part

to look like this:
#Option "DPMS"
or make it so
Option "DPMS" "0"
reboot, and see if things are better
Also consider this too

OK I think I narrowed down the problem a bit.
First, I tested the DMPS. I disabled it either with your method either with "xset s off -dpms". It didn't work.
But I made some observations. If I am right the TV screen blacks only when I see netflix. Not when I see youtube or vlc. So the problem is probably related with DMR plugin (not sure how is that possible). The weirdest is that the other screen works fine. Also I remember that I have watched netflix for long enough in the past, some times with no problem. Even when it appears, there is not a standard time interval before the black screen.

Since it takes some time, I will test the new user method tomorrow.

OK it happens to the test account too.

Do you have an idea?

The problem still exists but I found a workaround. If I fullscreen from Netflix interface (the square bottom right), the problem appears. If I fullscreen with F11, it works fine.

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