Google-chrome – Make Chrome use nVidia card instead of integrated one for hardware accelerated elements

Well, sounds like your display configuration is set to “Extended” on the log-on screen. Since you set your primary display to be on the NVIDIA card, the monitor just shows nothing. You can probably move your mouse there, too.

You could try simply disabling the unwanted GPU in Device Manager. I do not have a system with multiple GPUs, so I cannot verify what happens then. I also don’t know if this setting sticks.

I only know that with a single GPU: It switches to the Windows equivalent of Linux’ VESA Framebuffer. This is of course not what you want, but you have been warned. :D

You could also try the “nouveau” driver for Linux, an open-source NVIDIA display driver.

On your laptop, all your displays are connected to the Integrated GPU (the Haswell - based Intel HD Graphics 4600), something you can confirm by:

1. Navigating to the "Set PhysX configuration" tab on the Nvidia Control Panel. It will show you how these displays are wired to the Intel Integrated Graphics controller.

2. Opening the Intel HD Graphics control panel, from where you'll be able to adjust advanced display settings for the 4k panel you have.

You mentioned that the 4k display panel is connected via DisplayPort, correct? In that case, you'll want to turn on DisplayPort MST (Multi-Stream Support) IF such an option is available. Its' often enabled for Daisy chained setups and where the same panel is fed by two DisplayPort 1.2a cables.

An example of such a setup where DisplayPort MST would be of use would be with a single Dell Ultra HD 4k Monitor P2715Q 27-Inch Screen LED-Lit Monitor , or a daisy-chained setup such as this one here.

It would also be useful if you shared your monitor's make and model here, might help with troubleshooting.

Notes from Intel's Quick Reference Guide for the Intel 4th Generation Core Processor Graphics, Haswell:

The main requirement for supporting 4K@60 on DP SST (single-stream transport) is that the core display clock (CDCLK), which is configured by SBIOS, must be set high enough to drive the dot clock required by the mode. Usually 4K@60 has a 536MHz dot clock, so it requires a 540MHz CDCLK. If the system OEM did not configure the CDCLK at 540MHz for thermal, power saving, or other reasons, then the system will not be able to drive 4K@60 over a single DP stream. Also, Haswell ULT (-U) and ULX (-Y) are limited to 450MHz and 337MHz CDCLK, so they will not be able to do 4K@60 SST. ULT should still be able to do 4K@60 MST, though. ULX can’t because 4K MST still requires HBR2.

This shouldn’t affect DP MST tiled displays because for those, Intel uses two streams, each for one half of the display, reducing the pixel clock.

Additionally, 4K support is only available on the Core processor graphics. Celeron and Pentium do not support 4K. All Core Haswell processors will support HBR2 with the exception of Haswell ULX.

Here is a reference guide that can be of help with Intel's Collage Mode, which controls DisplayPort's SST and MST modes.