I have two displays attached to the GTX980 card: Samsung SA850 is connected via DisplayPort and a Sony TV through HDMI. The problem is with Samsung, it doesn’t turn off in power saving mode. After the idle timeout the screen goes black but the backlight remains on and never turns off. I also tried the ‘sleep 1; xset dpms force off’ command from the console, but result is the same.
I have a dual-boot Windows 7 on the same machine, and on Windows the monitor turns off as expected, so the hardware seems to be fine. I also tried connecting the monitor via DVI-I and it seems to work as well. So the problem is with DisplayPort connection. Is there a way to fix it?
Kubuntu 14.10 x86_64, Xorg 1.16, nvidia driver 346.16
nvidia-bug-report.log.gz (94.5 KB)