First post, tell me if im missing information, im on Fedora KDE 44, monitor and cable worked on windows 11, can select proper resolution in settings
Post the output from inxi -Fzxx.
Specifically we want to see which drivers and which version of drivers you are running on your 1050 Ti.
Graphics:
Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: ASUSTeK
driver: i915 v: kernel arch: Gen-9.5 ports: active: HDMI-A-1,eDP-1
empty: DP-1,HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:3e9b
Device-2: NVIDIA GP107M [GeForce GTX 1050 Ti Mobile] vendor: ASUSTeK
driver: nvidia v: 580.159.04 arch: Pascal pcie: speed: 2.5 GT/s lanes: 16
bus-ID: 01:00.0 chip-ID: 10de:1c8c
Device-3: IMC Networks USB2.0 HD UVC WebCam driver: uvcvideo type: USB
rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 1-7:4 chip-ID: 13d3:5666
Display: x11 server: X.Org v: 21.1.23 with: Xwayland v: 24.1.12
compositor: kwin_x11 driver: X: loaded: modesetting,nvidia
alternate: fbdev,nouveau,nv,vesa dri: iris gpu: i915 display-ID: :0
screens: 1
Screen-1: 0 s-res: 5760x2160 s-dpi: 96
Monitor-1: HDMI-A-1 mapped: HDMI-1 pos: right model: VG34VQL3A
res: 3840x2160 hz: 30 dpi: 122 diag: 869mm (34.2")
Monitor-2: eDP-1 pos: primary,left model: ChiMei InnoLux 0x1747
res: 1920x1080 hz: 120 dpi: 128 diag: 437mm (17.2")
Most monitors support the normal 3840x2160 (4k) and 1920x1080 (HD) (both are 16x9) resolutions, but your desired resolution (3440x1440) seems to ask for a much different screen aspect (43x18 or 21.5x9)
I tend to believe this screen ratio is far enough out that the monitor cannot support it. Possibly try using 3360x1440 (21x9) and see if that might be possible. That at least is an even ratio.
This shows the system is configuring things exactly as expected with the width being the sum of the 2 monitors width (1920+3840=5760) and the height the same as the tallest monitor (2160) giving a ratio of 24x9.
You could possibly reduce the larger monitor to using the same HD resolution as the smaller monitor and it would then yield 3840x1080 or 32x9
This model seems to have 3440x1440 native resolution.
That seems correct, so it may be that pairing it with a standard HD monitor (1920x1080) is throwing the aspects far enough out that the system adjusts to a suitable matching resolution.
@potatcat
What happens if you disconnect the other monitor and boot with only the gaming monitor attached?
i was working with an LLM to try and fix this and it points to (the rest of this was written by the LLM)
The Intel iGPU (i915) HDMI output is rejecting the 3440×1440 mode at the kernel display pipeline stage, so the mode never reaches the screen even though it appears in KDE and xrandr. This happens because the HDMI/CRTC configuration on this hardware cannot allocate a valid scanout setup for that resolution, causing the system to silently fall back to 2560×1600. As a result, the resolution option is visible but cannot be applied due to a hardware/driver limitation rather than a desktop environment issue.