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I've just installed a fresh Debian 9.4.0 on a PC with a PRIME Z370-A motherboard (Integrated Graphics Processor- Intel® HD Graphics) and an additional ZOTAC GeForce GTX 1070 graphics card. I'd like to use the GTX 1070 for computations. The monitor ProLite XUB2792QSU-B1 is connected to the Intel card via a HDMI cable.

Now, after I logged in to my user, the resolution was 1024x768 (instead of 2560x1440). These are the results of xrandr command:

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
   1024x768      76.00*

These are the currently available controllers:

lspci -k
...
00:02.0 VGA compatible controller: Intel Corporation Device 3e92
        Subsystem: ASUSTeK Computer Inc. Device 8694
        Kernel modules: i915
02:00.0 VGA compatible controller: NVIDIA Corporation GP104 [GeForce GTX 1070] (rev a1)
        Subsystem: ZOTAC International (MCO) Ltd. GP104 [GeForce GTX 1070]
        Kernel modules: nouveau

The xrandr --listproviders command yields Providers: number : 0

What should I do to be able to use my monitor at its full available resolution?

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General information

Unless on both ends there is HDMI version 2.0, you would have to use DisplayPort.

Specifically to your case

Your monitor has one HDMI version 1.4, which has limitations, you may want to see specification on Wikipedia. You will have to use DisplayPort.

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    I tried to connect the monitor using a DisplayPort cable, but the result is the same - the only available resolution is 1024x768. – Paweł Kłeczek Jun 12 '18 at 14:46
  • @PawełKłeczek DisplayPort <-> DisplayPort directly? Don't use any reductions. – LinuxSecurityFreak Jun 13 '18 at 4:05

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