After upgrading to F24, I'm having the following problem. I have KDE Settings -> Power Management -> Energy Saving set to turn on "screen energy saving" after 10 minutes. This blanks the screen after 10 minutes of inactivity, as expected. (xset -q shows that DPMS is enabled, too, of course.)
Previously, hitting the Alt key or clicking the mouse would bring back the desktop quickly. Now (on two different machines), it's not coming back. But the machine is recognizing the keyboard--I've found that if I do Ctl-Alt-F2 to switch to a virtual terminal, the monitor quickly shows the login prompt, and I can go back to X on VT-1 and my Plasma desktop is there. But hitting other keys (Return, Alt, random letters) doesn't seem to wake it up. The monitor acts as if there's no input from the computer. It's the DPMS Suspend state that's the problem; the display comes back when it's in the Standby one. One of the machines has screen locking turned on but the other doesn't. These are both Dell Precision workstations with Intel integrated graphics, in case that matters (one with a Dell monitor and the other with a Samsung monitor). I didn't (intentionally) change the settings until I started trying to troubleshoot after the problem arose, so these should all have been the same as under F23. I did find an very old bug that might have to do with this, with a comment from March (747162). I tried using xset to turn of DPMS; then the screen doesn't blank at all. And the same sort of thing happens with the KDE settings version turned off and DPMS on. Disabling DPMS means the monitor stays on. So it's seems like it's really a problem with DPMS, not the KDE settings. The workaround of switching to a VT means this isn't urgent, but it is annoying. What am I missing? George
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