Dees the video card have an HDMI port to test on the monitor HDMI to see if it also has the same issue? Have you disconnected the monitor USB cabling from the computer to see if USB is the culprit?
* Click Start
* Enter power
* Click Power Options
* Click Change plan settings
* Click Change advanced power settings
* Select High Performance
* Open PCI Express
* Open Link State Power Management
* Set it to Off
* Click Apply- OK
Much better! I tried changing just the Link State Power Management under Balanced to Off in power options which had no effect. Changing to High Performance however seemed to work. I've tested it ~10 times so far and it has been waking up every time.
Win7 x64, R9 270, Catalyst 13.12, and 14.2beta, Dell UP2414Q, DP 1.2 60hz
These power management settings don't fix anything here. Monitor still fails to wake up about half the time, requiring a power-off, power-on to bring the display back. I haven't been able to find a pattern for when it wakes and when it doesn't. Dell UP2414Q and displayport are not ready for prime-time.
I had this problem back in early January with my new UP2414Q but in my case it would take as much as 30 minutes or more to get the monitor to work. Leaving the heat on overnight in my office helped a lot. But, a replacement monitor solved the problem completely. I now see the BIOS on startup and always have a working monitor upon recovering from sleep or a morning cold-boot. I still have the common stability problem if I try to use DisplayPort 1.2.