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refactor(linux): simplify GPU-vendor detection for DMA-BUF toggle

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Follow-up on #217. Blind A/B test on NVIDIA + proprietary confirmed the
toggle helps, but the detection path had a few rough edges.

- Drop lspci and glxinfo fallbacks: the /proc/driver/nvidia/version +
  sysfs scan catch every realistic case, and spawning subprocesses in
  main() added startup latency for no win (glxinfo also isn't always
  installed — mesa-utils isn't a hard dep).
- Scan all /sys/class/drm/card* entries via read_dir instead of
  hardcoded card0/card1 — hybrid laptops and systems where only card1
  exists were previously missed.
- Remove 0x1022 from the AMD list: that's AMD's host/chipset vendor ID,
  not GPU. Only 0x1002 (ATI/Radeon) belongs here.
- Unknown vendor → leave WEBKIT_DISABLE_DMABUF_RENDERER unset instead
  of forcing =1. VMs, ARM SBCs and anything exotic keep the WebKitGTK
  default and do not get regressed by a guess.
- Only set the env var for the NVIDIA case. Intel/AMD on Mesa already
  default to DMA-BUF enabled in current WebKitGTK, so the explicit =0
  was redundant.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Psychotoxical
2026-04-19 22:08:59 +02:00
parent d145a7758e
commit 36caf3a14c
1 changed files with 24 additions and 76 deletions
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src-tauri/src/main.rs
+24 -76
View File
@@ -12,72 +12,28 @@ enum GpuVendor {
#[cfg(target_os = "linux")]
fn detect_gpu_vendor() -> Option<GpuVendor> {
use std::fs;
use std::process::Command;
// Check for NVIDIA driver presence (most reliable for proprietary drivers)
if fs::metadata("/proc/driver/nvidia/version").is_ok() {
return Some(GpuVendor::Nvidia);
}
// Check sysfs DRM vendor IDs (works for most integrated/discrete GPUs)
let vendor_paths = [
"/sys/class/drm/card0/device/vendor",
"/sys/class/drm/card1/device/vendor",
];
for path in &vendor_paths {
if let Ok(vendor_id) = fs::read_to_string(path) {
let vendor_id = vendor_id.trim();
// PCI vendor IDs: NVIDIA=0x10de, Intel=0x8086, AMD=0x1002/0x1022
match vendor_id {
"0x10de" => return Some(GpuVendor::Nvidia),
"0x8086" => return Some(GpuVendor::Intel),
"0x1002" | "0x1022" => return Some(GpuVendor::Amd),
_ => {}
}
// Iterate every `/sys/class/drm/card*` — hybrid laptops expose multiple
// cards, and some systems have no `card0` at all.
let entries = fs::read_dir("/sys/class/drm").ok()?;
for entry in entries.flatten() {
let name = entry.file_name();
let Some(name) = name.to_str() else { continue };
if !name.starts_with("card") || name.contains('-') {
continue;
}
}
// Fallback: try lspci to detect GPU vendor (requires pciutils)
if let Ok(output) = Command::new("lspci").args(["-nn"]).output() {
if output.status.success() {
let stdout = String::from_utf8_lossy(&output.stdout);
for line in stdout.lines() {
let line_lower = line.to_lowercase();
// Only match VGA/Display controllers, not audio or other devices
let is_display = line_lower.contains("vga")
|| line_lower.contains("display")
|| line_lower.contains("3d controller");
if is_display && line_lower.contains("nvidia") {
return Some(GpuVendor::Nvidia);
}
if is_display
&& (line_lower.contains("intel") || line_lower.contains("i915"))
{
return Some(GpuVendor::Intel);
}
if is_display && (line_lower.contains("amd") || line_lower.contains("radeon"))
{
return Some(GpuVendor::Amd);
}
}
}
}
// Last resort: glxinfo (requires active display / X11 session)
if let Ok(output) = Command::new("glxinfo").args(["-B"]).output() {
if output.status.success() {
let stdout = String::from_utf8_lossy(&output.stdout).to_lowercase();
if stdout.contains("nvidia") {
return Some(GpuVendor::Nvidia);
}
if stdout.contains("intel") {
return Some(GpuVendor::Intel);
}
if stdout.contains("amd") || stdout.contains("radeon") {
return Some(GpuVendor::Amd);
}
let Ok(vendor_id) = fs::read_to_string(entry.path().join("device/vendor")) else {
continue;
};
match vendor_id.trim() {
"0x10de" => return Some(GpuVendor::Nvidia),
"0x8086" => return Some(GpuVendor::Intel),
"0x1002" => return Some(GpuVendor::Amd),
_ => {}
}
}
@@ -101,22 +57,14 @@ fn main() {
std::env::set_var("WEBKIT_DISABLE_COMPOSITING_MODE", "1");
}
// Detect GPU vendor and configure DMA-BUF renderer appropriately.
// NVIDIA proprietary drivers have issues with DMA-BUF in WebKitGTK,
// so we disable it for NVIDIA. Mesa drivers (Intel/AMD) handle it well.
if std::env::var("WEBKIT_DISABLE_DMABUF_RENDERER").is_err() {
match detect_gpu_vendor() {
Some(GpuVendor::Nvidia) => {
std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
}
Some(GpuVendor::Intel) | Some(GpuVendor::Amd) => {
std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "0");
}
None => {
// Unknown GPU: default to safe mode (disable DMA-BUF)
std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
}
}
// NVIDIA proprietary adds a small but reproducible overhead on the
// DMA-BUF renderer path (blind A/B confirmed on NVIDIA + proprietary).
// Unknown GPUs keep the WebKitGTK default — VMs, ARM SBCs and anything
// exotic should not be regressed by a guess.
if std::env::var("WEBKIT_DISABLE_DMABUF_RENDERER").is_err()
&& matches!(detect_gpu_vendor(), Some(GpuVendor::Nvidia))
{
std::env::set_var("WEBKIT_DISABLE_DMABUF_RENDERER", "1");
}
}