https://bugs.kde.org/show_bug.cgi?id=508435
Bug ID: 508435
Summary: KDE Portal's screen sharing permission is persistent
and cannot be reset, preventing screen re-selection in
Krfb on Wayland.
Classification: Applications
Product: krfb
Version First unspecified
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Summary of the Problem:
When using Krfb on a KDE Plasma Wayland session with multiple monitors, the XDG
Desktop Portal permission for screen sharing becomes persistent and is
impossible to reset through standard user actions. After granting permission to
share a specific screen once, the portal no longer presents the screen
selection dialog on subsequent attempts. This makes it impossible to switch
which screen is being shared (e.g., switching from the primary monitor to a
virtual monitor), rendering multi-monitor sharing scenarios unusable. This
persistent state survives application restarts, session restarts
(logout/login), and even the manual deletion of all known user-level
configuration and state files.
Steps to Reproduce:
- On a system with two or more monitors (in my case, one physical and one vkms
virtual monitor), log into a KDE Plasma Wayland session.
- Verify that both monitors are active and arranged in "Extend" mode in the
Display Configuration settings.
- Launch Krfb.
- Check the "Enable Desktop Sharing" box.
- The first portal dialog appears: "Remote control requested". Check the box
"Allow restoring on future sessions" and click "Share".
- A second portal dialog appears, asking to choose which screen to share.
Selected the primary monitor (e.g., Screen 1, eDP-1).
- The VNC session starts, correctly sharing the primary monitor.
- Stop the share by unchecking "Enable Desktop Sharing" in the Krfb window.
- Attempt to start a new share by re-checking the "Enable Desktop Sharing" box.
Observed Behavior:
The share starts immediately, streaming the primary monitor again. The second
portal dialog (the one for screen selection) does not appear. It is no longer
possible to choose the secondary (Virtual-1) monitor.
Expected Behavior:
The screen selection dialog should appear every time a new share is initiated
to select what type of screen share you want (duplicate, extended, etc.) or
there should be a clear and functional way for the user to reset this
permission to be prompted again.
Extensive Troubleshooting Steps Performed (What did NOT work):
To solve this "stuck" permission, we attempted a comprehensive series of
resets, none of which forced the screen selection dialog to reappear:
- Toggling the "Enable Desktop Sharing" checkbox multiple times.
- Closing and relaunching the Krfb application.
- Logging out of the Plasma session and logging back in.
- A full system reboot.
- Manually deleting all known configuration and state files related to Krfb and
the portal, followed by a reboot. This included:
~/.config/krfbrc
~/.config/xdg-desktop-portal-kderc
~/.local/state/krfbstaterc
~/.local/state/xdg-desktop-portal-kdestaterc
- Deleting the krfb entry from the KDE Wallet Manager (kwalletmanager).
Even after a "Full Reset" (deleting all the files above), Krfb would still
restore its previous state (except when the kwalletmanager folder was deleted
where the password configured in krfb was reset, but the screen selection
options menu still did not appear) and would not show the screen selection
dialog after the initial permission request.
This appears to be a bug in how the KDE Desktop Portal handles permission
persistence for screen sharing, making it impossible to reset a user's choice.
I hope this detailed report, including the extensive troubleshooting steps
performed, is helpful in diagnosing this persistent behavior.
Thank you for all your hard work on Krfb and the entire KDE Plasma ecosystem.
It's an incredibly powerful and useful tool, and I greatly appreciate the
effort that goes into its development.
Please let me know if any further information or testing is required from my
end.
Best regards,
Gabriel
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Kernel Version: 6.16.1-arch1-1 (64-bit)
Graphics Platform: Wayland
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