Connecting via HDMI rather than displayport has completely solved the waking issue for me (so far, at least). The monitor consistently wakes from sleep in the same configuration that I was using before suspending. Monitor settings are still not persistent across reboots, but this seems to be a more general issue that can be fixed via an appropriate startup script.
I have seen some reports of the U2415 having some problems with daisy- chaining via displayport and that Dell is giving people the runaround. Sounds like there is some flaw with the displayport, so perhaps we're seeing another effect of that. Will report back in case anything changes. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1412730 Title: DELL U2415 monitor detection issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1412730/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
