From 699fc73aa72a4ab2eb5e90ff1be933b97f89a663 Mon Sep 17 00:00:00 2001
From: sigma <albertbraimi@gmail.com>
Date: Mon, 23 Mar 2026 22:18:45 +0100
Subject: [PATCH] backend/drm: support semicolon delimiter for PCI paths in
 AQ_DRM_DEVICES

---
 src/backend/drm/DRM.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/backend/drm/DRM.cpp b/src/backend/drm/DRM.cpp
index 83b9b4d..8ce80ac 100644
--- a/src/backend/drm/DRM.cpp
+++ b/src/backend/drm/DRM.cpp
@@ -177,7 +177,18 @@ static std::vector<SP<CSessionDevice>> scanGPUs(SP<CBackend> backend) {
     auto                            explicitGpus = getenv("AQ_DRM_DEVICES");
     if (explicitGpus) {
         backend->log(AQ_LOG_DEBUG, std::format("drm: Explicit device list {}", explicitGpus));
-        Hyprutils::String::CVarList explicitDevices(explicitGpus, 0, ':', true);
+        std::string explicitGpusStr = explicitGpus;
+        char delimiter = ':';
+
+        std::error_code ec;
+        if (std::filesystem::exists(explicitGpusStr, ec)) {
+            delimiter = ';';
+        }
+
+        if (explicitGpusStr.find(';') != std::string::npos)
+            delimiter = ';';
+        
+        Hyprutils::String::CVarList explicitDevices(explicitGpus, 0, delimiter, true);
 
         // Iterate over GPUs and canonicalize the paths
         for (auto& d : explicitDevices) {
@@ -189,6 +200,10 @@ static std::vector<SP<CSessionDevice>> scanGPUs(SP<CBackend> backend) {
             // TODO: Verify that the path is a valid DRM device. (https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/master/backend/session/session.c?ref_type=heads#L369-387)
             if (ec) {
                 backend->log(AQ_LOG_ERROR, std::format("drm: Failed to canonicalize path {}", d));
+
+                if (delimiter == ':') {
+                     backend->log(AQ_LOG_ERROR, "drm: If you are using PCI paths with colons, use ';' as a separator instead of ':'.");
+                 }
                 continue;
             }