Hi guys, first post here.
I'm trying to get my monitor (Asus MG279Q) running at 144Hz, but in system settings under Displays, it only shows the options Auto or 59.95Hz.
I have tried messing with xrandr (https://wiki.archlinux.org/index.php/xrandr#Adding_undetected_resolutions) to no avail, but I have no idea if I'm doing it right.
The monitor is running from my laptop using a DisplayPort-cable, and works perfectly fine with my Windows 10 computer which has an nVidia GPU.

Here are some specs that may be of importance:

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OS: Arch Linux x86_64
Model: HP EliteBook 840 G1 A3009DD10303
Kernel: 4.15.14-1-ARCH
Packages: 1014
Shell: bash 4.4.19
Resolution: 1600x900, 2560x1440
DE: KDE
WM: KWin
CPU: Intel i5-4200U (4) @ 2.600GHz
GPU: Intel Integrated Graphics
Memory: 7047MiB / 7876MiB

lspci -v :

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00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Haswell-ULT Integrated Graphics Controller
        Flags: bus master, fast devsel, latency 0, IRQ 49
        Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

xrandr gives me this:

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DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95*
   1920x1080     60.00    60.00    50.00    59.94 
   1280x1024     75.02    60.02 
   1440x900      59.89 
   1152x864      75.00 
   1280x720      60.00    50.00    59.94 
   1440x576      50.00 
   1024x768      75.03    70.07    60.00 
   1440x480      60.00    59.94 
   832x624       74.55 
   800x600       72.19    75.00    60.32    56.25 
   720x576       50.00 
   640x480       75.00    66.67    60.00    59.94 
   720x400       70.08

Thanks! :)

You sure your laptop can run the display port at 144?
What is the res and refresh of the laptop screen?

compatico wrote:You sure your laptop can run the display port at 144?

According to this thread https://h30434.www3.hp.com/t5/Notebook-Video-Display-and-Touch/Elitebook-840-G3-Display-Port-maximum-resolution-applies-to/td-p/6038189, it should at least be able to run at 120Hz.

compatico wrote:What is the res and refresh of the laptop screen?

1600x900@60Hz

petternett wrote:

compatico wrote:You sure your laptop can run the display port at 144?

According to this thread https://h30434.www3.hp.com/t5/Notebook-Video-Display-and-Touch/Elitebook-840-G3-Display-Port-maximum-resolution-applies-to/td-p/6038189, it should at least be able to run at 120Hz.

compatico wrote:What is the res and refresh of the laptop screen?

1600x900@60Hz

Quoting a public forum thread with a lot of "should" and "might" wording is not fact. You need hard data. Even if the hardware is technically capable, doesn't mean the manufacturer designed it to meet those capabilities, and when configuring the system they can set whatever they think is good enough. No good complaining if the hardware can't do what you expect or want.

Find the specifications from HP for the display port output and see if your laptop supports it.
Until you know the facts, the rest is just a waste of resources...