[Tauri Linux] Unable to start screen share

[Wolf-Seisenbacher]

Describe the bug

Unable to start the Screenshare in a voice call on the current Tauri Linux build v1.20.1-nightly.260801145147-dev (1f81361)

[2026-08-02][04:05:38][tauri_runtime_cef::policy][INFO] granted [Microphone] to tauri://localhost/ in webview "main"
[2026-08-02][04:05:42][tauri_runtime_cef::policy][INFO] granted [ScreenCapture] to tauri://localhost/ in webview "main"
ALSA lib /var/tmp/portage/media-libs/alsa-lib-1.2.15.3/work/alsa-lib-1.2.15.3/src/pcm/pcm.c:2722:(snd_pcm_open_noupdate) [error.pcm] Unknown PCM loopback
[12278:12278:0802/000542.171373:ERROR:media/audio/alsa/alsa_util.cc:204] PcmOpen: loopback,No such file or directory

I have tested older versions of the Nightly, and it does work fine.

Reproduction

Join a voice room
Grant access to screen share
Attempt to screenshare

Expected behavior

Screenshare should work fine

Platform and versions

-/oyddmdhs+:.                wolf@crux
     -odNMMMMMMMMNNmhy+-`             OS: Gentoo 2.18
   -yNMMMMMMMMMMMNNNmmdhy+-           Kernel: x86_64 Linux 6.18.39-gentoo-dist
 `omMMMMMMMMMMMMNmdmmmmddhhy/`        Uptime: 28m
 omMMMMMMMMMMMNhhyyyohmdddhhhdo`      Packages: 1688
.ydMMMMMMMMMMdhs++so/smdddhhhhdm+`    Shell: bash 5.3.9
 oyhdmNMMMMMMMNdyooydmddddhhhhyhNd.   Resolution: 6257x1440
  :oyhhdNNMMMMMMMNNNmmdddhhhhhyymMh   DE: KDE
    .:+sydNMMMMMNNNmmmdddhhhhhhmMmy   WM: KWin
       /mMMMMMMNNNmmmdddhhhhhmMNhs:   GTK Theme: Breeze-Dark [GTK2], Breeze [GTK3]
    `oNMMMMMMMNNNmmmddddhhdmMNhs+`    Icon Theme: breeze-dark
  `sNMMMMMMMMNNNmmmdddddmNMmhs/.      Disk: 7.4T / 13T (62%)
 /NMMMMMMMMNNNNmmmdddmNMNdso:`        CPU: AMD Ryzen Threadripper 3960X 24-Core @ 48x 4.78005GHz
+MMMMMMMNNNNNmmmmdmNMNdso/-           GPU: NVIDIA GeForce RTX 4090
yMMNNNNNNNmmmmmNNMmhs+/-`             RAM: 7002MiB / 128755MiB
/hMMNNNNNNNNMNdhs++/-`               
`/ohdmmddhys+++/:.`                  
  `-//////:--.

Additional context

No response