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WebKitGTK's DMA-BUF renderer fails on a Wayland session with the NVIDIA driver ("Error 71 (Protocol error) dispatching to Wayland display") and the app exits before showing a window. On that combination WEBKIT_DISABLE_DMABUF_RENDERER=1 is set at startup unless the user already set it.
52 lines
2.2 KiB
Rust
52 lines
2.2 KiB
Rust
//! WebKitGTK's DMA-BUF renderer fails on Wayland with the NVIDIA driver: the window
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//! never shows and GDK logs "Error 71 (Protocol error) dispatching to Wayland display".
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//! On that combination the renderer is turned off before the first web view is created.
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const DISABLE_DMABUF: &str = "WEBKIT_DISABLE_DMABUF_RENDERER";
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/// Run before other threads start (`set_var`).
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#[cfg(target_os = "linux")]
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pub fn configure() {
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let nvidia = ["/proc/driver/nvidia/version", "/sys/module/nvidia"].iter().any(|p| std::path::Path::new(p).exists());
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if disable_dmabuf(|k| std::env::var(k).ok(), nvidia) {
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tracing::info!("Wayland with the NVIDIA driver: {DISABLE_DMABUF}=1");
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unsafe { std::env::set_var(DISABLE_DMABUF, "1") };
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}
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}
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/// A Wayland session on the NVIDIA driver, unless the user already set the variable.
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fn disable_dmabuf(var: impl Fn(&str) -> Option<String>, nvidia: bool) -> bool {
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if !nvidia || var(DISABLE_DMABUF).is_some() {
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return false;
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}
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let wayland_display = var("WAYLAND_DISPLAY").is_some_and(|v| !v.is_empty());
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// GDK tries the backends of `GDK_BACKEND` in order.
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let gdk_wayland =
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var("GDK_BACKEND").is_none_or(|b| matches!(b.split(',').next().map(str::trim), Some("wayland" | "*" | "")));
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wayland_display && gdk_wayland
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn decide(vars: &[(&str, &str)], nvidia: bool) -> bool {
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disable_dmabuf(|k| vars.iter().find(|(name, _)| *name == k).map(|(_, v)| v.to_string()), nvidia)
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}
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#[test]
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fn turns_the_dmabuf_renderer_off_on_wayland_with_nvidia_only() {
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assert!(decide(&[("WAYLAND_DISPLAY", "wayland-0")], true));
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assert!(decide(&[("WAYLAND_DISPLAY", "wayland-0"), ("GDK_BACKEND", "wayland,x11")], true));
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assert!(!decide(&[("WAYLAND_DISPLAY", "wayland-0")], false));
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assert!(!decide(&[("DISPLAY", ":0")], true));
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assert!(!decide(&[("WAYLAND_DISPLAY", "")], true));
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assert!(!decide(&[("WAYLAND_DISPLAY", "wayland-0"), ("GDK_BACKEND", "x11")], true));
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}
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#[test]
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fn keeps_the_users_own_setting() {
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assert!(!decide(&[("WAYLAND_DISPLAY", "wayland-0"), (DISABLE_DMABUF, "0")], true));
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}
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}
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