Arch Linux User Repository

@username227

I added those variable. The app starts now as it should, BUT all videos throw a black screen. Audio works. I think this is an Nvidia Problem? Well, I'll switch to AMD GFX anyway.

See this comment for a similar issue. Try running the program with this variable:

QMLSCENE_DEVICE=softwarecontext QT_OPENGL=software Plex

and let me know if it helps. also those on KDE working try it as well to make sure it doesn't break anything.

https://bbs.archlinux.org/viewtopic.php?pid=2205003#p2205003

My pacman -Qi plasma-desktop output is basically the same as @wurstbrot's. Also on 6.5.3-1.1 so it's definitely a CachyOS thing.

I ran Plex from terminal. It was spamming this.

[84746:84802:1123/203558.752647:ERROR:gl_context_egl.cc(277)] eglCreateContext failed with error EGL_BAD_CONTEXT [84746:84802:1123/203558.752651:ERROR:gpu_channel_manager.cc(771)] ContextResult::kFatalFailure: Failed to create shared context for virtualization. [84746:84802:1123/203558.752654:ERROR:shared_image_stub.cc(470)] SharedImageStub: unable to create context [84746:84802:1123/203558.752657:ERROR:gpu_channel.cc(449)] GpuChannel: Failed to create SharedImageStub

I don't see anything obvious in the logs. It's interesting that both of you are using CachyOS. @wurstbrot your plasma-desktop package is version 6.5.3-1.1, while the official package from the extra repo is 6.5.3-1. I'm assuming CachyOS patched the package somehow. It might be that this is due to some weird patch CachyOS added. I don't use that OS, so I can't help. Maybe someone else can...

EDIT: Have you tried looking at the output of running Plex from terminal? The command should just be Plex

@el-gazzle

❯ env | grep -E 'WAYLAND_DISPLAY|XDG_SESSION_TYPE'
XDG_SESSION_TYPE=wayland
WAYLAND_DISPLAY=wayland-0

❯ pacman -Qi plasma-desktop
Installed From           : cachyos-extra-v3
Name                     : plasma-desktop
Version                  : 6.5.3-1.1
Beschreibung             : KDE Plasma Desktop
Architektur              : x86_64_v3
URL                      : https://kde.org/plasma-desktop/
Lizenzen                 : LGPL-2.0-or-later
Gruppen                  : plasma
Stellt bereit            : Nichts
Hängt ab von             : attica  baloo  emoji-font  gcc-libs  glibc  kauth  kbookmarks  kcmutils  kcodecs  kcompletion  kconfig  kconfigwidgets  kcoreaddons  kcrash
                           kdbusaddons  kdeclarative  kglobalaccel  kguiaddons  ki18n  kiconthemes  kio  kirigami  kirigami-addons  kitemmodels  kitemviews  kjobwidgets
                           kmenuedit  knewstuff  knotifications  knotifyconfig  kpackage  kpipewire  krunner  kservice  ksvg  kwidgetsaddons  kwindowsystem  kxmlgui
                           libcanberra  libksysguard  libwacom  libx11  libxcb  libxcursor  libxi  libxkbcommon  libxkbfile  libplasma  plasma-activities
                           plasma-activities-stats  plasma-workspace  plasma5support  polkit-kde-agent  powerdevil  qt6-5compat  qt6-base  qt6-declarative  sdl2  solid  sonnet
                           systemd-libs  systemsettings  wayland  xcb-util-keysyms  xdg-user-dirs
Optionale Abhängigkeiten : bluedevil: Bluetooth applet [Installiert]
                           glib2: kimpanel IBUS support [Installiert]
                           ibus: kimpanel IBUS support
                           kaccounts-integration: OpenDesktop integration plugin [Installiert]
                           kscreen: screen management [Installiert]
                           libaccounts-qt: OpenDesktop integration plugin [Installiert]
                           packagekit-qt6: to install new krunner plugins
                           plasma-nm: Network manager applet [Installiert]
                           plasma-pa: Audio volume applet [Installiert]
                           scim: kimpanel SCIM support
Benötigt von             : Nichts
Optional für             : cachyos-emerald-kde-theme-git  cachyos-iridescent-kde  cachyos-nord-kde-theme-git
In Konflikt mit          : Nichts
Ersetzt                  : Nichts
Installationsgröße       : 36,53 MiB
Packer                   : CachyOS <admin@cachyos.org>
Erstellt am              : Di 18 Nov 2025 17:48:39 CET
Installiert am           : Sa 22 Nov 2025 18:57:26 CET
Installationsgrund       : Ausdrücklich installiert
Installations-Skript     : Nein
Verifiziert durch        : Signatur

I had to paste the plex.log to github, because more than 5k characters. https://gist.github.com/Pflaumenaugust/14661ee2a208ab3f48884e70b0181bf4

@wurstbrot @Eyeball I can't reproduce. I'm also on KDE Plasma on Wayland

Maybe you can find some info in the logs? They should be under $HOME/.local/share/plex/Logs

Some output from my system to show my current setup

➜  ~ env | grep -E 'WAYLAND_DISPLAY|XDG_SESSION_TYPE'
WAYLAND_DISPLAY=wayland-0
XDG_SESSION_TYPE=wayland
➜  ~ pacman -Qi plasma-desktop 
Name            : plasma-desktop
Version         : 6.5.3-1
Description     : KDE Plasma Desktop
Architecture    : x86_64
URL             : https://kde.org/plasma-desktop/
Licenses        : LGPL-2.0-or-later
Groups          : plasma
Provides        : None
Depends On      : attica  baloo  emoji-font  gcc-libs  glibc  kauth  kbookmarks  kcmutils  kcodecs  kcompletion  kconfig  kconfigwidgets  kcoreaddons  kcrash  kdbusaddons  kdeclarative
                  kglobalaccel  kguiaddons  ki18n  kiconthemes  kio  kirigami  kirigami-addons  kitemmodels  kitemviews  kjobwidgets  kmenuedit  knewstuff  knotifications  knotifyconfig
                  kpackage  kpipewire  krunner  kservice  ksvg  kwidgetsaddons  kwindowsystem  kxmlgui  libcanberra  libksysguard  libwacom  libx11  libxcb  libxcursor  libxi
                  libxkbcommon  libxkbfile  libplasma  plasma-activities  plasma-activities-stats  plasma-workspace  plasma5support  polkit-kde-agent  powerdevil  qt6-5compat  qt6-base
                  qt6-declarative  sdl2  solid  sonnet  systemd-libs  systemsettings  wayland  xcb-util-keysyms  xdg-user-dirs
Optional Deps   : bluedevil: Bluetooth applet [installed]
                  glib2: kimpanel IBUS support [installed]
                  ibus: kimpanel IBUS support
                  kaccounts-integration: OpenDesktop integration plugin [installed]
                  kscreen: screen management [installed]
                  libaccounts-qt: OpenDesktop integration plugin [installed]
                  packagekit-qt6: to install new krunner plugins
                  plasma-nm: Network manager applet [installed]
                  plasma-pa: Audio volume applet [installed]
                  scim: kimpanel SCIM support
Required By     : None
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 36,00 MiB
Packager        : Tomaz Canabrava <tcanabrava@archlinux.org>
Build Date      : di 18 nov 2025 14:50:54 CET
Install Date    : za 22 nov 2025 17:52:07 CET
Install Reason  : Explicitly installed
Install Script  : No
Validated By    : Signature

Got the same problem as @wurstbrot. CachyOS, KDE Plasma 6.5.3, Wayland.

The Plex window opens, you can see the edges of it (where you drag to change size) but the inside is just see-through. Moving your mouse inside it just leaves a trail of the Plex icon.

For now I've installed the Flathub version so I'm not bothered by it, but thought I'd try to give a bit more of a description of what's happening.

Does not work on kde-plasma 6.5.3 wayland. Just an empty window pulling trails. Sorry for the poor description, but I'm a Linux n00b.

well I upgraded on my end using Cinnamon before I pushed and it seemed to work just fine. Hopefully others will have the same experience.

@username227, Thanks for responding so quickly! Yes, I've tested it and have been using the app for the last two days with no issues so far. I expect the patch won't be an issue in non-KDE desktop environments, but confirmation from a few more users couldn't hurt.