Suddenly one of three monitors (DELL U2414H) stopped working. In nvidia-settings I can see 4 lanes instead of 2.
It is the only visible difference between working and not working monitor configuration.
Sometimes, I have a similar issue with the wrong number of lanes, but 1 lane instead of 2. It happens after turning the monitor off and on, and is OS- and driver-independent. The only solution I found is re-plugging the DP several times. With some probability it works.
It does not help now, though (when I see 4 lanes instead of 2).
What can I do to solve this? Is it a problem with signal coming from the video card?
Drivers version: Linux x64 375.82
There is also a projector connected via HDMI as the 4th monitor.