When I use more than 1 PIE window for multiplayer testing the windows constantly flicker and switch among themselves. Anyone of the windows will change randomly displaying multiple instances of the preview clients. When I am playing in the active window it stops for that client. All the windows seem to switch about 3-5 times a second, its extremely annoying. If you look at the attached pictures one of the them has the client 3 window replicated 3 times. Any advice would be appreciated.
PC Specs if it helps:
Modified MSI GE70 Apache Pro-012
Intel Core i7-4710HQ 2.5 GHz, 3.3 to 3.5 GHz Turbo Boost
NVIDIA Geforce GTX860M with 2GB GDDR5 VRAM
12 GB DDR3L SDRAM
512 SSD
Windows 7 x64
I attempted to reproduce this on a couple of different systems here, but I couldn’t get your results. Could you setup a test project that his this issue and upload it here?
I made a quick video and attached it with a third person template file. The problem persists in any project. The video is taken of the project I attached. I will try a fresh install tomorrow to see if that helps.
I know on my desktop the problem is gone. I will see if I can reformat the hard drive, reinstall windows and see if its fixed It will take some time. No other advice from your end?
I can confirm its related to nvidia drivers. I reinstalled windows and tested with only necessary drivers. Using just intel HD 4600 the quality is low but no flicker. Also it only flickers when I use single core preview with nvidia drivers. When I tried using multiple cores it opens all windows fine although it takes longer and seems to lag a bit between clients and server. I tried nvidia driver 355.82 - WHQL, and 332.35. Same problem on both. I tried playing with the 3D app settings on the nvidia control panel but nothing I tried worked. If you have any suggestions please share. The reason I bought this laptop to have better performance in the editor, hopefully this can be worked out.
I take it you’re using the Nvidia Optimus GPU Switching software(I believe it’s integreated with Nvidia Control Panel)? There are known issues with the Optimus sofware and there are some possible workarounds.
Nope didn’t help, that seems to be outdated. The registry keys they mention in the link are not on my system. Like I said above, if I disable the Nvidia GPU switching for Unreal Engine it works (very poorly). When I enable the Nvidia GPU for Unreal is when it glitches, the suggestion you gave seems to fix a problem where the GPU switcher is not switching.
I should also note I didn’t see any reference to anything called “Optimus”. It might be what its called but its definitely not obvious.
I was able to test this myself on one of our Razer Blade machines and got it to reproduce. I’ve entered the bug into our system as UE-21711. Would you mind leaving at least the video up on your google drive until I’ve confirmed that this is fixed?
Hi any progress on this? Also any chance you can confirm the issue persist across different Windows operating systems? Considering upgrading to Windows 10 if it will solve the issue.
Thanks.
The bug is currently in the queue, but that queue is rather long and this does not hold an extremely high priority. We don’t currently have a Win10 Geforce laptop to test on and we don’t have any other reports of users trying local multiplayer on laptops. Sorry to say that I don’t know if Win10 will help you.
