The monitor and cable are fine; I use them with a different laptop without issues.
I tried to manually configure the monitor to be used with KDE's "Display Configuration" program, but it does not show up.
Also, I did `xrandr --listmonitors` and saw that only the internal display is present in the output:
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Monitors: 1
0: +*eDP-1 3840/344x2160/194+0+0 eDP-1
- when plugging in the HDMI cable:
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Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: RRScreenChangeNotify
Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Window: 58720261
Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Root: 2393
Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Rotation: "Rotate_0"
Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Size ID: 0
Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Size: 3840 2160
Jun 28 20:48:19 slim org.kde.KScreen[1748]: kscreen.xcb.helper: SizeMM: 1016 571
Jun 28 20:48:20 slim org.kde.KScreen[1748]: kscreen.xrandr: Emitting configChanged()
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Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: RRScreenChangeNotify
Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Window: 58720261
Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Root: 2393
Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Rotation: "Rotate_0"
Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Size ID: 0
Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: Size: 3840 2160
Jun 28 20:48:27 slim org.kde.KScreen[1748]: kscreen.xcb.helper: SizeMM: 1016 571
Jun 28 20:48:28 slim org.kde.KScreen[1748]: kscreen.xrandr: Emitting configChanged()
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01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Ti Mobile] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Lenovo TU117M [GeForce GTX 1650 Ti Mobile]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 185
IOMMU group: 1
Region 0: Memory at ad000000 (32-bit, non-prefetchable) [size=16M]
Region 1: Memory at 80000000 (64-bit, prefetchable) [size=256M]
Region 3: Memory at 90000000 (64-bit, prefetchable) [size=32M]
Region 5: I/O ports at 3000 [size=128]
Expansion ROM at ae080000 [virtual] [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nvidia
Kernel modules: nvidia
What could be the problem?