I’ve seen several old threads with this issue that lost activity because apparently issue got fixed for people (in the past).
DPMS with Display Port monitor does not work for me, and haven’t ever.
I have 980 with several monitors (DVI,HDMI,DP) and only for DP monitor powersave does not work.
Symptoms: “sleep 1; xset dpms force off” will cause monitor to turn off for a split second then it turns on again. If I have X blanking enabled, it will turn on to display a black screen and mouse cursor :)
“xset dpms force {off|stanby|suspend}” all have the same effect.
Monitor: Samsung S27D850T
Monitor: Dell UP2716D
Current driver: 370.28
DP: 1.2
Desktop environment: doesn’t matter, Plasma, GNOME, i3, all the same.
But with nouveau DPMS works, so it is not a hardware issue.
There is a Dell UP2716D that settled in on my desktop. Also connected via Display Port and also doesn’t have functional DPMS with Nvidia linux driver. 375.20 by the way.
Could we get a fix for the driver, or a workaround so our monitors would save power?
Another me too, this has not been working for a long time. I have a GTX980 with two (daisy-chained) Dell U2414H monitors connected via DisplayPort. Currently on driver 375.20. Nvidia blames the monitor firmware, but they fixed it in a few beta drivers long ago (I don’t remember the exact working driver versions, but they were a year, maybe more ago). Then broke it again when they released the non-beta version of the driver and seem like they are ignoring any further posts about the issue. nvidia-bug-report.log.gz (283 KB)
That’s good (and bad :P), maybe it will get them to look into it (again). And yeah, it works for me in Windows, and with the nouveau driver. Just the fact that they released a driver where DPMS worked, then it stopped working again the next driver says to me it is most likely a nvidia issue, but that is really just speculation. I just wanted to let you know not to get your hopes up.
This sounds like it might be a different issue. Or maybe it is just a different symptom of the same issue. For me, my screen never turns off. If I issue xset dpms force off, my screens just go black (the backlight never turns off).
I have found interesting bit of information on accident. If Dell is the only active output (as in only one enabled in xrandr, not physically) then DPMS works, next if I enable any other output additionally (for example HDMI-0) then DMPS for Dell monitor stops working.
For Samsung monitor DPMS never works though, even if its a single active output.
Nearly six months later and this still appears to be a problem. Primary monitor on DP, secondary on DVI, the secondary blanks correctly, the primary doesn’t regardless of whether the secondary is connected, or even if the secondary wasn’t connected when the system booted. It will go out momentarily as if switching modes, then come back to the mouse cursor on top a black screen. Lock screen appears on mouse/keyboard activity and system remains perfectly usable.