Displayport MST, secondary monitor stuck in sleep-mode

I have a desktop running Ubuntu 19.10 LTS with a GeForce GTX 970. I have two Dell monitors U2515H and a U2713HM, the 27" is setup as primary monitor.
The connection is PC->U2515H->U2713HM, with DP1.2 enabled on the 25"

Previously, I had issues where my secondary display would go into sleep mode, but following this answer fixed my issues.

After upgrading to the newest nvidia driver(440) I am now facing the same issues. The secondary monitor always go into sleep-mode. If I change which monitor is the primary, the secondary is always the one to be stuck in sleep-mode.

I have tried using xrandr as described in this answer, but to no avail. I have not been able to find any other useful suggestions.

Ubuntu: 19.10 LTS
Kernel: 5.5.9
CPU: AMD Ryzen 5 2600
GPU: GeForce GTX 970, nvidia driver 440.64

2 Answers

Leu's solution works like a charm, but for those who do not have a "xorg.conf" in above location (/etc/X11/xorg.conf) - there is simple option to generate one based on your current configuration.

Simply open

"NVIDIA X Server Settings" -> "X Server Display Configuration" -> "Save to X Configuration File"

(bottom right button).

Try this:

In your X-configuration file (should be /etc/X11/xorg.conf) add a Device-Option "HardDPMS", set to "false".

In my case, the Device-Section looks like:

Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce RTX 2060" Option "HardDPMS" "false"
EndSection

You will need your other work-around (xset dpms force off) as well.

(Hints on the modified driver behaviour were found here)

1

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