rustdesk/rustdesk · error · anyhow::Error

Failed to get display {}, the displays' count is {}

Error message

Failed to get display {}, the displays' count is {}

What it means

In test_create_capturer's retry loop, Display::all() returned fewer displays than the requested display_idx. The requested monitor does not currently exist (index out of range — displays enumerated while being reconfigured, or the index refers to a disconnected monitor).

Source

Thrown at src/server/video_service.rs:324

                    Capturer::new(display).with_context(|| "Failed to create capturer")?,
                ));
            }
        }
    };
}

// This function works on privacy mode. Windows only for now.
pub fn test_create_capturer(
    privacy_mode_id: i32,
    display_idx: usize,
    timeout_millis: u64,
) -> String {
    let test_begin = Instant::now();
    loop {
        let err = match Display::all() {
            Ok(mut displays) => {
                if displays.len() <= display_idx {
                    anyhow!(
                        "Failed to get display {}, the displays' count is {}",
                        display_idx,
                        displays.len()
                    )
                } else {
                    let display = displays.remove(display_idx);
                    match create_capturer(privacy_mode_id, display, display_idx, false) {
                        Ok(_) => return "".to_owned(),
                        Err(e) => e,
                    }
                }
            }
            Err(e) => e.into(),
        };
        if test_begin.elapsed().as_millis() >= timeout_millis as _ {
            return err.to_string();
        }
        std::thread::sleep(Duration::from_millis(300));

View on GitHub (pinned to 91c9fccbb0)

Solutions

1. Wait for display reconfiguration to settle — the loop retries until the timeout
2. Re-enumerate displays and pick a valid index (typically 0 for primary)
3. Verify the display index passed from the client matches the server's current monitor layout

When it happens

Trigger: Thrown at src/server/video_service.rs:324 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rustdesk/rustdesk@91c9fccbb0 (2026-09-10). Data as JSON: /api/errors/8ee2aa9d2f66d822. Report an issue: GitHub.