I have recently purchased both a Dell 4K display (P2715Q) and a new Macbook (Retina, 12", 2015). According to Apple's website, the MacBook should be capable of driving the display at full resolution at 30 Hz, when connected over HDMI (via Apple's own USB-C to HDMI adapter), https://support.apple.com/en-us/HT202856. While the display is detected correctly and I can select up to the full 3840 x 2160 (though it defaults to 1920 x 1080) pixel settings, the Dell display continually flickers, going blank for a fraction of second every few seconds. This behavior persists regardless of the choice of scaling.
Has anyone else encountered this issue (or not) with this setup (or other 4K display)? Any strategy to resolve this issue?
Things I've tried:
- Doing an NVRAM reset on the Mac (https://support.apple.com/en-us/HT204063, as suggested by Apple's help desk) and
- a Factory Reset in the Dell monitor menu options (the only suggestion from Dell's help desk)
both of these appear to reduce or sometimes stop the flickering for a few hours, but it returns by the end of the day (or if the Mac is left on over night). Having to reset NVRAM every day isn't a great experience...
Edit the problem persists both while the laptop is in Clamshell mode (with the lid closed) or open as an additional monitor.