Sorry, I know this is a re-post but I could not reply to those posts. My P2715Q (still in warranty) is not waking up from sleep. I have Dell and HP machines and after either machine goes to sleep and then wake up, the monitor does not wake up.
Dell: Windows 7, ATI Radeon, HDMI
HP: Windows 10, NVIDIA GTX 745, mDP (also tried with HDMI)
My Dell U2715HM does NOT have this issue (with either machines). All display drivers are up to date. Monitor has been reset to factory state.
I have tried calling Dell many times and they checked my Dell machine and settings are okay. The issue is very annoying. Any ideas?