I have some issues with one of my screens. I think it is a graphic card related problem. I'm running debian 3.16.34-2 (jessie). I have four screens (Samsung S24E650) for which I bought a new graphic card (GeForce GTX 1050). One display is using the DisplayPort the other three are using HDMI. One of the HDMI display shows some red flickering (horizontal lines). It happens not always and depends what kind of window is active on this screen. I see the flickering when I'm looking at the desktop (standard debian wallpaper) without any other windows. Browsing the web is another case when I see the flickering. I don't see it if I have a terminal (full screen mode) on that screen. The nvidia drivers I'm using are
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las@thinkstation:~$ nvidia-smi
Thu Jun 8 09:52:51 2017
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 375.66 Driver Version: 375.66 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 1050 Off | 0000:03:00.0 On | N/A |
| 0% 58C P0 48W / 120W | 792MiB / 1998MiB | 2% Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 724 G /usr/bin/Xorg 465MiB |
| 0 2241 G /usr/bin/gnome-shell 323MiB |
| 0 2393 G nvidia-settings 1MiB |
+-----------------------------------------------------------------------------+
las@thinkstation:~$