HDMI port on laptop won't use GPU

[daxfohl]

I have an HP laptop with an Nvidia 840M. In theory the video card supports up to 2560x1600. However when I plug in my Dell 30" 2560x1600 via HDMI, all it can get is 1920x1200. The odd thing is in the Windows Screen Resolution Advanced Settings, it says it's using the Intel adapter. So I tried disabling the Intel adapter in the Device Manager, but that seemed to disable the HDMI port completely. What's going on here? Is this expected? Is the Nvidia GPU completely isolated from the HDMI output somehow?

840M specs:
H.264, VC1, MPEG2 1080p video decoder
Up to 2560x1600 LCD – eDP 1.2 support
Up to 1920x1200 LCD – LVDS support
Up to 2048x1536 VGA analog display Support
Up to 2560x1600 DisplayPort Multimode Support
HDMI
HDCP content protection
7.1 channel HD audio on HDMI
TrueHD and DTS-HD Audio Bitstreaming

 

[ronintexas]

HP has Nvidia control panel where you choose which programs utilize the GPU and which utilize the intel graphics. The intel graphics utilize less power, so most items should be defaulted to use that - you have to tell it to allow Windows to utilize the Nvidia 840M as the default for Windows - and then it should output to the HDMI.

 

[daxfohl]

Yeah I did that the first day I bought the computer. I'm coming to think it's not possible. In the Nvidia control panel there's no "Display" tab, and the PhysX tab looks like all outputs are hooked up to the Intel GPU. At this point I'm kind of confused as to what the point of adding the separate video card even is. What can it do / how does it get used if it's not hooked up to the outputs?

 

[daxfohl]

While it's still using the Intel port, http://www.notebookcheck.net/2560x1440-or-2560x1600-via-HDMI.92840.0.html seemed to be the trick I needed to get 2560x1600 resolution out of it.

 

[rodrigoloan2703]

While it's still using the Intel port, http://www.notebookcheck.net/2560x1440-or-2560x1600-via-HDMI.92840.0.html seemed to be the trick I needed to get 2560x1600 resolution out of it.

hey ! did you find the solution ?