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fix(linux): disable WebKitGTK compositing in VMs to fix black iframes #441

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Merged
koala73 merged 1 commit into from
Feb 26, 2026
Merged

fix(linux): disable WebKitGTK compositing in VMs to fix black iframes #441

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32 changes: 32 additions & 0 deletions src-tauri/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1131,6 +1131,38 @@ fn main() {
unsafe { env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1") };
}

// WebKitGTK promotes iframes, <video>, and canvas to GPU-textured
// compositing layers. In VMs (Apple Virtualization.framework,
// QEMU/KVM, VMware, etc.) the virtio-gpu driver often only supports
// 2D or limited GL — GBM buffer allocation for compositing layers
// fails silently, rendering iframe/video content as black while the
// main page (software-tiled) works fine.
//
// Detect VM environments via /proc/cpuinfo "hypervisor" flag or
// sys_vendor strings and disable accelerated compositing + force
// software GL so all content renders through the CPU path.
let in_vm = std::fs::read_to_string("/proc/cpuinfo")
.map(|c| c.contains("hypervisor"))
.unwrap_or(false)
|| std::fs::read_to_string("/sys/class/dmi/id/sys_vendor")
.map(|v| {
let v = v.trim().to_lowercase();
v.contains("qemu") || v.contains("vmware") || v.contains("virtualbox")
|| v.contains("apple") || v.contains("parallels") || v.contains("xen")
|| v.contains("microsoft") || v.contains("innotek")
})
.unwrap_or(false);

if in_vm {
if env::var_os("WEBKIT_DISABLE_COMPOSITING_MODE").is_none() {
unsafe { env::set_var("WEBKIT_DISABLE_COMPOSITING_MODE", "1") };
}
if env::var_os("LIBGL_ALWAYS_SOFTWARE").is_none() {
unsafe { env::set_var("LIBGL_ALWAYS_SOFTWARE", "1") };
}
eprintln!("[tauri] VM detected; disabled WebKitGTK accelerated compositing for iframe/video compatibility");
}

// On Wayland-only compositors (e.g. niri, river, sway without XWayland),
// GTK3 may fail to initialise if it defaults to X11 backend first and no
// DISPLAY is set. Explicitly prefer the Wayland backend when a Wayland
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