One of my displays randomly turns black, sometimes staying black, sometimes turning back on after a few seconds, sometimes flickering between on and off. The backlight is still on, the OS does not seem to detect a missing display. Turning the display off completely and on again fixes the issue most of the time, however only for another few hours of usage. I'm trying to figure out if this is a hardware issue or a software issue.
The display in question is one of two identical Dell U2515H, each connected to a separate DisplayPort on a Gigabyte mainboard, running a current Fedora Linux. There's no discrete GPU installed, the system uses the Core i5's integrated GPU. One of the displays shows the symptoms described, the other one is fine. Here's what I have tried unsuccessfully so far:
- swapped the DisplayPort cable for a new one
- switched DisplayPorts on the computer (the mainboard has two DisplayPorts): Behavior stayed with the panel
- switched primary and secondary screen in Fedora
- switched from miniDisplayPort input to DisplayPort input (display has both connectors)
Any pointer is greatly appreciated!
Update: It was a faulty display, called Dell's customer support and got it replaced free of charge. Thank you all!