Created attachment 902246 [details] Output of randr Description of problem: I have a Dell U2711 monitor. I recently upgraded to a new PC. When connected via a displayport to DVI converter, everything is fine. However, if I connect natively using just displayport, the screen won't wake from power save mode. Version-Release number of selected component (if applicable): xorg-x11-server-utils-7.7-2.fc20.x86_64 How reproducible: Every time Steps to Reproduce: 1. Enable screensaver overnight 2. The following morning, the monitor won't awaken 3. Actual results: Expected results: Additional info: When in power saving mode, the monitor claims no signal is coming from the computer. Normally, "xrandr --output DP-2 --auto" should be sufficient to turn the screen back on, but that doesn't work here. It does work with the other monitors connected to the same video card. I'm using the nouveau drivers. localhost:~% lspci | fgrep VGA 01:00.0 VGA compatible controller: NVIDIA Corporation GK107 [NVS 510] (rev a1)
I've found elsewhere on the net suggestions to disable DDC/CI in the monitor as a workaround. However, having done so yesterday, the screen was dead again when I came into work this morning. Note that it doesn't need a full reboot to fix it. Logging out of my window manager and hence returning to gdm sends whatever signal is needed to the monitor to reactivate the screen.
Is there any more information I can provide that might help with getting this fixed? As a workaround, I'd settle for some means of manually sending the "wake up from power save" signal to the monitor. I could then invoke that from one of the other screens each morning.
(In reply to Tethys from comment #2) > Is there any more information I can provide that might help with getting > this fixed? As a workaround, I'd settle for some means of manually > sending the "wake up from power save" signal to the monitor. I could > then invoke that from one of the other screens each morning. You could give a 3.16-rc2 kernel (should be available in rawhide) a try. A lot of work went into fixing stuff like this for DP on Nouveau in 3.16.
Yep, with 3.16-rc2, the display wakes up correctly. Many thanks. I guess the bug should stay open until Fedora is due to ship a 3.16 kernel?
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