diff --git a/src/backends/drm/drm_backend.cpp b/src/backends/drm/drm_backend.cpp
index f54d8b1fb3..86c6569e27 100644
--- a/src/backends/drm/drm_backend.cpp
+++ b/src/backends/drm/drm_backend.cpp
@@ -215,7 +215,9 @@ bool DrmBackend::initialize()
     } else {
         const auto devices = m_udev->listGPUs();
         for (const UdevDevice::Ptr &device : devices) {
-            addGpu(device->devNode());
+            if (device->seat() == m_session->seat()) {
+                addGpu(device->devNode());
+            }
         }
     }
 
@@ -244,8 +246,16 @@ void DrmBackend::handleUdevEvent()
         if (!m_active) {
             continue;
         }
-        if (!m_explicitGpus.isEmpty() && !m_explicitGpus.contains(device->devNode())) {
-            continue;
+
+        // Ignore the device seat if the KWIN_DRM_DEVICES envvar is set.
+        if (!m_explicitGpus.isEmpty()) {
+            if (!m_explicitGpus.contains(device->devNode())) {
+                continue;
+            }
+        } else {
+            if (device->seat() != m_session->seat()) {
+                continue;
+            }
         }
 
         if (device->action() == QStringLiteral("add")) {
diff --git a/src/utils/udev.cpp b/src/utils/udev.cpp
index 02dec3960e..398fed7d9c 100644
--- a/src/utils/udev.cpp
+++ b/src/utils/udev.cpp
@@ -7,9 +7,6 @@
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "udev.h"
-#include "main.h"
-#include "platform.h"
-#include "session.h"
 #include "utils/common.h"
 // Qt
 #include <QByteArray>
@@ -102,23 +99,14 @@ std::vector<UdevDevice::Ptr> UdevEnumerate::find()
         return {};
     }
     std::vector<UdevDevice::Ptr> vect;
-    QString defaultSeat = QStringLiteral("seat0");
     udev_list_entry *it = udev_enumerate_get_list_entry(m_enumerate.data());
     while (it) {
         auto current = it;
         it = udev_list_entry_get_next(it);
         auto device = m_udev->deviceFromSyspath(udev_list_entry_get_name(current));
-        if (!device) {
-            continue;
+        if (device) {
+            vect.push_back(std::move(device));
         }
-        QString deviceSeat = device->property("ID_SEAT");
-        if (deviceSeat.isEmpty()) {
-            deviceSeat = defaultSeat;
-        }
-        if (deviceSeat != kwinApp()->session()->seat()) {
-            continue;
-        }
-        vect.push_back(std::move(device));
     }
     return vect;
 }
@@ -230,6 +218,15 @@ bool UdevDevice::isBootVga() const
     return systAttrValue && qstrcmp(systAttrValue, "1") == 0;
 }
 
+QString UdevDevice::seat() const
+{
+    QString deviceSeat = udev_device_get_property_value(m_device, "ID_SEAT");
+    if (deviceSeat.isEmpty()) {
+        deviceSeat = QStringLiteral("seat0");
+    }
+    return deviceSeat;
+}
+
 QString UdevDevice::action() const
 {
     return QString::fromLocal8Bit(udev_device_get_action(m_device));
diff --git a/src/utils/udev.h b/src/utils/udev.h
index 96a0c47e9b..9a5538b54f 100644
--- a/src/utils/udev.h
+++ b/src/utils/udev.h
@@ -38,6 +38,7 @@ public:
 
     QMap<QByteArray, QByteArray> properties() const;
     bool isBootVga() const;
+    QString seat() const;
 
     operator udev_device *() const
     {