From 1502fa9ab1f470877b466a4bb56dc32524696644 Mon Sep 17 00:00:00 2001
From: Xiao YaoBing <xiaoyaobing@uniontech.com>
Date: Tue, 18 Jul 2023 08:44:09 +0000
Subject: [PATCH] prevent the primaryGpu is a usb device in multi-gpu scenes

if usb device is the primaryGpu, the device unplug kwin_wayland exit

`   } else if (device->action() == QStringLiteral("remove")) {
            DrmGpu *gpu = findGpu(device->devNum());
            if (gpu) {
                if (primaryGpu() == gpu) {
                    qCCritical(KWIN_DRM) << "Primary gpu has been removed! Quitting...";
                    QCoreApplication::exit(1);
                    return;
                } else {
                    gpu->setRemoved();
                    updateOutputs();
                }
           }`
---
 src/utils/udev.cpp | 15 +++++++++++++++
 src/utils/udev.h   |  1 +
 2 files changed, 16 insertions(+)

diff --git a/src/utils/udev.cpp b/src/utils/udev.cpp
index fe00cef029..ae032d83dc 100644
--- a/src/utils/udev.cpp
+++ b/src/utils/udev.cpp
@@ -126,6 +126,15 @@ std::vector<UdevDevice::Ptr> Udev::listGPUs()
     enumerate.scan();
     auto vect = enumerate.find();
     std::sort(vect.begin(), vect.end(), [](const UdevDevice::Ptr &device1, const UdevDevice::Ptr &device2) {
+        // prevent usb devices from becoming the primaryGpu
+        if (device1->isHotpluggable()) {
+            return false;
+        }
+
+        if (device2->isHotpluggable()) {
+            return true;
+        }
+
         // if set as boot GPU, prefer 1
         if (device1->isBootVga()) {
             return true;
@@ -231,6 +240,12 @@ QString UdevDevice::action() const
     return QString::fromLocal8Bit(udev_device_get_action(m_device));
 }
 
+bool UdevDevice::isHotpluggable() const
+{
+    QString devPath = QString::fromUtf8(udev_device_get_devpath(m_device));
+    return devPath.toLower().contains("usb");
+}
+
 UdevMonitor::UdevMonitor(Udev *udev)
     : m_monitor(udev_monitor_new_from_netlink(*udev, "udev"))
 {
diff --git a/src/utils/udev.h b/src/utils/udev.h
index 83586763dd..bb3c7bb9ff 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;
+    bool isHotpluggable() const;
 
     operator udev_device *() const
     {