Arch Linux

Jolo

Member

Registered: 2025-04-05

Posts: 1

Internal display (eDP-1) goes black when I connect external monitor.

Hello everyone,
I'm experiencing an issue with my laptop running Arch Linux and KDE Plasma on Wayland when hot-plugging an external HDMI monitor. Basically when I hot-plug my external HDMI monitor, my internal laptop display immediately goes black. It completely disappears from KDE's Display Configuration settings and also from the output of xrandr (only HDMI-A-1 is listed). It's as if the internal display ceases to exist for the system.
However, if I reboot the laptop with the HDMI monitor already connected, both displays (eDP-1 and HDMI-A-1) work perfectly fine in an extended desktop setup from the start. Note that when the built-in screen goes black, in settings there`s no option to extend the screen.
I dont` think it is a driver problem.

$ lspci -k | grep -A 2 -E "(VGA|3D)"
00:02.0 VGA compatible controller: Intel Corporation TigerLake-LP GT2 [Iris Xe Graphics] (rev 01)
        Subsystem: Lenovo Device 3f87
        Kernel driver in use: i915
--
01:00.0 3D controller: NVIDIA Corporation TU117M [GeForce MX450] (rev a1)
        Subsystem: Lenovo Device 3f87
        Kernel driver in use: nvidia

I`ve tried journalclt to check log errors, but I don`t seem to find anything (at least from what I understand, I`m quite new):

Apr 04 19:33:21 archlinux kwin_wayland[725]: kwin_core: XCB error: 147 (BadOutput), sequence: 2735, resource id: 1087, major code: 140 (RANDR), minor code: 30 (SetOutputPrimary)
Apr 04 19:33:21 archlinux plasmashell[895]: kde.plasmashell: requesting unexisting screen available rect -1
Apr 04 19:33:21 archlinux kwalletd6[671]: qt.qpa.wayland: There are no outputs - creating placeholder screen
Apr 04 19:33:21 archlinux DiscoverNotifier[1107]: qt.qpa.wayland: There are no outputs - creating placeholder screen
Apr 04 19:33:21 archlinux org_kde_powerdevil[944]: qt.qpa.wayland: There are no outputs - creating placeholder screen

I thought it might have been the fact that I set the external monitor as primary, maybe it tricked the problem somehow, but even changing that hasn`t done anything.
If you need more info just let me know.
Thanks in advance for any help.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 75,389

Re: Internal display (eDP-1) goes black when I connect external monitor.

also from the output of xrandr

Apr 04 19:33:21 archlinux kwin_wayland[725]: kwin_core: XCB error: 147 (BadOutput), sequence: 2735, resource id: 1087, major code: 140 (RANDR), minor code: 30 (SetOutputPrimary)

xrandr on wayland has limited meaning - do you get the same behavior w/ plasma on X11?

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