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Using a fresh install of Fedora 34 Workstation edition(GNOME) on a dell latitude 7400 laptop, I'm struggling to make my external display to work, an Asus ROG PG278Q 27". Connecting through the USB-C port, the display shows up in the system settings as an "unknown display" and the resolution is capped at 1024x768.

Things I already did:

  • updated all packages with dnf update
  • tried setting the resolution with xrandr, following this resolution
    • xrandr --newmode "2560x1440-144ghz" 808.75 2560 2792 3072 3584 1440 1443 1448 1568 -hsync +vsync
    • xrandr --addmode XWAYLAND1 "2560x1440-144ghz"
    • xrandr --output XWAYLAND1 --mode "2560x1440-144ghz" - gives me "X Error of failed request: BadValue (integer parameter out of range for operation) "

system info:

  • Graphics: Mesa Intel® UHD Graphics 620 (WHL GT2)

  • Windowing system: Wayland

  • GNOME Version: 40.4

  • lspci | grep VGA output: 00:02.0 VGA compatible controller: Intel Corporation WhiskeyLake-U GT2 [UHD Graphics 620] (rev 02)

This is my first time in many years switching to a linux desktop, this display used to work on my previous windows 10 instalation and it also worked in my (brief) rocky linux 8 installation.

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  • I have the exact same issue with an AMD RX 6600 and a PG278Q. It looks like there's a longstanding bug about it. Its an extremely annoying bug, it essentially means that my monitor is useless. Commented Jan 8, 2022 at 22:18

1 Answer 1

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I was able to finally get this fixed by changing my "Windowing System" from Wayland (default on gnome) to X11, then following the xrandr guide I posted in the original question.

You can check your windowing system in "settings > about" and you can change the windowing system when you log out and there should be the option on the right-hand bottom side of the screen where you input your password

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