External Monitor Flicker

[OPTiK]

I just got a Dell UltraSharp U3415W hooked up to my i5 SP3 w/dock. I noticed that if I setup the monitor with Display Port 1.2 settings, the monitor will flicker on and off and resolution will reset randomly when coming out of sleep. When I turn DP 1.2 off, everything is fine. I replaced the stock Dell cable with a StarTech (StarTech.com 6 ft Mini DisplayPort to DisplayPort 1.2 Adapter Cable M/M - DisplayPort 4k with HBR2 support - 6 feet Mini DP to DP Cable) and the issue is still happening with DP 1.2. Does anyone have any suggestions? Thanks!

 

[agt499]

Try changing the Refresh Rate.
My wife is in deep thought using out monitors at the moment so I'm totally not certain of the numbers, but I think by default our Dells were detected as 59Hz, but changing to 60Hz permanently eliminated the flicker. (And work fine with the stock Dell mDP→DP cable).
Should help with the flicker, but the randomly resetting resolution my be more of a fact of life between docked/undocked : I find it most reliable to at least logout if not reboot when docking.

Good luck!

 

[leeshor]

I thought about the refresh rate the first time I read the post, based on the title 't sound as much like a refresh flicker as it did an intermittent flashing.

 

[OPTiK]

Thanks for the suggestions everyone! I've adjusted the refresh rate to 60hz, hopefully it will solve my issue

 

[leeshor]

In a typical office setting, if in the US, 60 Hz is not going to be a solution for some. With no fluorescent lights it may work.

 

[OPTiK]

Looks like I'm still having the issue. I changed the SP3 refresh to 60hz too. I was watching a video and the monitor turned off/on. I think I'm going to have to revert the DisplayPort 1.2 setting.