30fps cap when duplicating screen

[Guest]

So whenever I duplicate the display on my laptop to another screen, it appears games are capped at 30fps. Some background info:

• This issue doesn't appear whenever I just extend the display
• It seems like all games are subject to this
• Afaik, no drivers or settings have battery saving enabled
• Laptop specs are an i5-7300HQ (Effectively turbos at 3.1GHz on all cores all the time) and a GTX 1050 (Or you can look at my signature)
• The display out is through HDMI (1.4) and is likely connected to the iGPU, though games running on the dGPU run fine over the connection
• Checking the display settings show that both screens are set to 60Hz

The reasons I'm suspecting are that a) the iGPU's bandwidth is a limiter, but maybe not since it can run a 4k and 1080p screen simultaneously just fine or b) a Windows limitation.

Its a very minor issue, just curious if any of you might know why this happens.

Edited December 21, 2017 by Guest
Wording

[GoodBytes]

If you have switchable graphics. The way it works is that the laptop panel and HDMI port are connected to the Intel integrated graphics, and the Nvidia GPU drivers takes each frame it has rendered from its own frame buffer, and instead of displaying to a display output, it dumps it in Intel integrated graphics frame buffer, and inject a call to fool the Intel GPU that it is done rendering the frame so that the Intel GPU outputs the frame to the connected display(s).

Pretty cleaver hack, if you ask me.

 

When you say: "duplicate", do you mean Clone or extend?

If you set the display to 1080p, do you have the problem? If yes, How about 720p?

And you are sure you have the latest drivers from the LAPTOP manufacture (not Nvidia or/and Intel website)

[Guest]

Just now, GoodBytes said:

If you set your display to clone the laptop display, does games pass 30fps?

If cloning, then no. If I extend the display, games run at 60fps just fine. Even more baffling is that I can have two separate games (Of course lighter ones as this is a laptop) both running on each display and surpass that 30fps mark.

[GoodBytes]

7 minutes ago, tjcater said:

If cloning, then no. If I extend the display, games run at 60fps just fine. Even more baffling is that I can have two separate games (Of course lighter ones as this is a laptop) both running on each display and surpass that 30fps mark.

Interesting...

And you are sure that when you clone, your settings are set to 60Hz/59Hz (59.94Hz) 1080p?

[Guest]

10 minutes ago, GoodBytes said:

Interesting...

And you are sure that when you clone, your settings are set to 60Hz/59Hz (59.94Hz)?

Yes. And a screen shot for good measure:

Spoiler

Edit: and its also set to 1080p

Edited December 21, 2017 by Guest
Wording and 1080p