Blank Window on Linux Mint (Flatpak)

[SpeeQz1]

Describe the bug

When downloading the Flatpak of Cinny and trying to open it, it gives you a blank window with nothing in it.
I have confirmed that it opens normally inside a VM.

Reproduction

1. Download Cinny Flatpak
2. Launch Cinny

Expected behavior

Cinny launches normally.

Platform and versions

1. OS: Linux Mint 22.3 x86_64
2. Browser: Mozilla Firefox 147.0.3
3. Cinny version: 4.10.0
4. Matrix homeserver: matrix.org

Additional context

Log:

/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=cinny in.cinny.Cinny

---

Gtk-Message: 02:05:46.693: Failed to load module "xapp-gtk3-module"

** (cinny:2): WARNING **: 02:05:46.795: webkit_settings_set_enable_offline_web_application_cache is deprecated and does nothing.
Gtk-Message: 02:05:46.810: Failed to load module "xapp-gtk3-module"
Failed to create GBM buffer of size 1280x905: Invalid argument

[JuanjoSalvador]

This looks like an issue with Flatpak package. Have you tried it with current release?

[SpeeQz1]

The latest Flatpak release still produces a blank window. Although when using Cinny as a web app it works fine.

[JuanjoSalvador]

I manage to run Cinny through Flatpak running this to override environment variables and fixing the Wayland issue.

flatpak override --user --env=WEBKIT_DISABLE_COMPOSITING_MODE=1 --env=WEBKIT_DISABLE_GPU_SANDBOX=1 in.cinny.Cinny

After this, it runs normally even using the desktop entry.

[SayaneI]

I manage to run Cinny through Flatpak running this to override environment variables and fixing the Wayland issue.

flatpak override --user --env=WEBKIT_DISABLE_COMPOSITING_MODE=1 --env=WEBKIT_DISABLE_GPU_SANDBOX=1 in.cinny.Cinny

After this, it runs normally even using the desktop entry.

Thank you very much, it worked now for me on Debian 13 Flatpak KDE. But, it's not normal that we had to surch an use such a workaround to make it fonctionnal.