From c4c46a089f0878df34219eae7aa94d6ecd1aa83b Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Wed, 28 Apr 2021 23:20:49 +0300
Subject: [PATCH] platforms/drm: Properly detect if there are no DRM devices

If no primary gpu can be found, we need to quit.
---
 src/plugins/platforms/drm/drm_backend.cpp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/plugins/platforms/drm/drm_backend.cpp b/src/plugins/platforms/drm/drm_backend.cpp
index d3fde7fa8e..eabcee66b0 100644
--- a/src/plugins/platforms/drm/drm_backend.cpp
+++ b/src/plugins/platforms/drm/drm_backend.cpp
@@ -192,16 +192,17 @@ bool DrmBackend::initialize()
 {
     connect(session(), &Session::activeChanged, this, &DrmBackend::activate);
     connect(session(), &Session::awoke, this, &DrmBackend::turnOutputsOn);
-    std::vector<UdevDevice::Ptr> devices = m_udev->listGPUs();
-    if (devices.size() == 0) {
-        qCWarning(KWIN_DRM) << "Did not find a GPU";
-        return false;
-    }
 
+    std::vector<UdevDevice::Ptr> devices = m_udev->listGPUs();
     for (unsigned int gpu_index = 0; gpu_index < devices.size(); gpu_index++) {
         addGpu(std::move(devices.at(gpu_index)));
     }
 
+    if (m_gpus.isEmpty()) {
+        qCWarning(KWIN_DRM) << "No suitable DRM devices have been found";
+        return false;
+    }
+
     initCursor();
     if (!updateOutputs())
         return false;