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FC25: External 4K monitor resolution not detected.

asked 2017-04-17 13:12:24 -0500

greatlinux gravatar image

Hi All,

I have Asus Zenbook Pro UX501VW and using installing fedora 25. On connecting Samsung 4K UHD monitor, fedora shows the max resolution available for 4K monitor is 1080p.

Details are as follows- H/w Detail- - Skylake 6700HQ - Graphics (Intel 530 and NVIDIA 960M)

Please let me know how I can get the right resolution for my secondary monitor. Thanks.

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answered 2017-04-24 12:10:41 -0500

greatlinux gravatar image

I resolved it myself. There is thunderbolt 3 port on my laptop and connecting the monitor to the that port resolved the issue, no other change needed.

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answered 2017-04-17 16:13:44 -0500

genodeftest gravatar image

According to Wikipedia, your Intel graphics card does not support 4k monitors, so you need to make sure the NVIDIA card is talking to the monitor. ark.intel.com shows different information, but changing the GPU could help anyway.

What is the exact resolution of your 4k monitor?

After you attach the monitor, what is the output of dmesg or journalctl -b? (Only the last few seconds are relevant there.)

Is the monitor attached to your mainboard (i.e. the Intel GPU) or to your graphics card? If you can choose, connect it to the NVIDIA card. You might want to try all external connectors if you have more than one.

On Fedora, GPU selection in multi-GPU setups is controlled by switcheroo. Its Github page shows that there is an option to disable using the internal GPU, you should try that first.

https://wiki.archlinux.org/index.php/... might help you, but note that Arch differs from Fedora in some aspects.

If that does not help, you might want to disable the Intel GPU by

  • disabling it in BIOS
  • unloading the i915 kernel module (see man modprobe for details)

but note that either solution will increase your notebook power consumption, because Intel GPUs are more energy efficient than NVIDIAs.

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@genodeftest
Laptop Display- 3840 × 2160 Monitor Display- 3840 × 2160

Intel GPU working fine for my laptop 4K display, Actual [Specification] here.. ( http://store.asus.com/us/item/201604A... )

I tried installing NVIDIA drivers several time on FC24 but every time it resulted bad and didn't came up.

Since There is no NVIDIA drivers, its all connecting to intel GPU I believe. I am not sure how to direct the Monitors to particular graphics. if someone may help.

greatlinux gravatar imagegreatlinux ( 2017-04-17 16:31:49 -0500 )edit

There are (binary) nvidia drivers for your card. The question is if you really want to install them.

There is also https://ask.fedoraproject.org/en/ques... and https://rpmfusion.org/Howto/nVidia#In...thedrivers - proceed carefull!

florian gravatar imageflorian ( 2017-04-18 10:59:18 -0500 )edit

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Asked: 2017-04-17 13:12:24 -0500

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Last updated: Apr 17 '17