About 2x a week, my computer will appear awake but unresponsive. It won't POST on reboot, but if I disconnect the monitor from the computer, turn it on, and then connect it again it'll load fine for a few more days before it happens again. This has been happening intermittently since I got the monitor, but has ramped up from about once a month to multiple times a week.
This never happened with my old 2408WFP, which was also hooked up via DP.
Purchased and tried a DP 1.2 certified cable (listed below), but it had no effect on the behavior.
When that wasn't happening and my computer wakes up from sleep, the display driver (not the monitor itself) was always reporting display link errors but it went away in the last Radeon driver patch.
* What is the 20 digit alpha-numeric monitor serial number?
CN-0V7WP9-74445-5CJ-641L REV A03
* What specific computer model?
Homebuilt
* What operating system?
Windows 10
* What video card?
AMD R9 290
* Video card driver version?
16.8.2
* What video out ports are available on the video card?
DP, 2xDVI, HDMI
* What video out port are you using from the video card to what video in port on the monitor?
DP to mDP (also tried with a DP to DP cable listed below)
* What cable are you using to attach the video card to the monitor?
Provided mDP to DP cable; also tried Accell B142C-007B UltraAV DisplayPort to DisplayPort 1.2 Cable with Locking Latches - 6.6 Feet (2 Meters)
* What windows power plan?
Balanced
PCI-E Link State Power Management: Moderate power savings
* Press the monitor Menu button to open the monitor OSD (On Screen Display). The bottom of that screen should show a resolution. What is listed?
3840*2160, 60Hz
* Was the monitor purchased from Dell or some reseller?
Amazon.com
*Other info:
16GB RAM
CPU Type
Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz