Anki won't start

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1

I am on KDE Plasma and on the unstable channel. Is anyone else having this issue?

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2

Run it in a terminal, share the error.

3 
Starting Anki 25.09.2…
2026-04-07 08:06:06,626:INFO:aqt.mediasrv: Serving on http://127.0.0.1:36599
Qt warning: GBM is not supported with the current configuration. Fallback to Vulkan rendering in Chromium.
4

anki-bin works, but not regular anki.

5

Tested on nixos-unstable with Niri, and I get the same behaviour. anki-bin works fine, but anki (output below) does not:

$ anki
Starting Anki 25.09.2...
2026-04-08 12:36:39,458:INFO:aqt.mediasrv: Serving on http://127.0.0.1:43459
Qt warning: GBM is not supported with the current configuration. Fallback to Vulkan rendering in Chromium.

It might be worth making a bug report on nixpkgs: Issues · NixOS/nixpkgs · GitHub

Be sure to include any info that might be relevant (e.g. command output, what graphics card/driver you’re using)

6

Actually, I wonder if this is a broader issue with Qt or one of its libraries :thinking:
I tried to run jellyfin-desktop and I see a similar issue in its logs:

2026-04-08 17:50:35.295 [info] unknown @ 0 - Starting Jellyfin version: 2.0.0 build date: 1980-01-01
2026-04-08 17:50:35.295 [info] unknown @ 0 -   Running on: NixOS 26.05 (Yarara) [6.18.21] arch x86_64
2026-04-08 17:50:35.295 [info] unknown @ 0 -   Qt Version: 6.10.2 [x86_64-little_endian-lp64]
2026-04-08 17:50:35.710 [warning] unknown @ 0 - GBM is not supported with the current configuration. Fallback to Vulkan rendering in Chromium.
7

Reported upstream, since it seems to be a common issue for a few Qt apps using qtwebengine that I’ve seen.

@lion What GPU are you using? I and someone who noticed a similar issue with nextcloud-client are both using NVIDIA.

8

GeForce RTX 50 series

9

As a workaround, setting QTWEBENGINE_FORCE_USE_GBM=0 should fix the problem for now (solution from this comment). For example:

$ QTWEBENGINE_FORCE_USE_GBM=0 jellyfin-desktop
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