$ cat /proc/asound/cards 
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0x44a18000 irq 180
 1 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0x43080000 irq 17
 2 [Audio          ]: USB-Audio - USB Audio
                      Generic USB Audio at usb-0000:00:14.0-3, high speed

$ lspci
00:00.0 Host bridge: Intel Corporation Device 4660 (rev 02)
00:01.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x16 Controller #1 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation AlderLake-S GT1 (rev 0c)
00:06.0 PCI bridge: Intel Corporation 12th Gen Core Processor PCI Express x4 Controller #0 (rev 02)
00:08.0 System peripheral: Intel Corporation 12th Gen Core Processor Gaussian & Neural Accelerator (rev 02)
00:0a.0 Signal processing controller: Intel Corporation Platform Monitoring Technology (rev 01)
00:14.0 USB controller: Intel Corporation Device 7ae0 (rev 11)
00:14.2 RAM memory: Intel Corporation Device 7aa7 (rev 11)
00:16.0 Communication controller: Intel Corporation Device 7ae8 (rev 11)
00:17.0 SATA controller: Intel Corporation Device 7ae2 (rev 11)
00:1c.0 PCI bridge: Intel Corporation Device 7ab8 (rev 11)
00:1c.1 PCI bridge: Intel Corporation Device 7ab9 (rev 11)
00:1c.2 PCI bridge: Intel Corporation Device 7aba (rev 11)
00:1c.3 PCI bridge: Intel Corporation Device 7abb (rev 11)
00:1c.4 PCI bridge: Intel Corporation Device 7abc (rev 11)
00:1f.0 ISA bridge: Intel Corporation Device 7a84 (rev 11)
00:1f.3 Audio device: Intel Corporation Device 7ad0 (rev 11)
00:1f.4 SMBus: Intel Corporation Device 7aa3 (rev 11)
00:1f.5 Serial bus controller: Intel Corporation Device 7aa4 (rev 11)
01:00.0 VGA compatible controller: NVIDIA Corporation Device 2203 (rev a1)
01:00.1 Audio device: NVIDIA Corporation GA102 High Definition Audio Controller (rev a1)
02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
04:00.0 Ethernet controller: Intel Corporation Ethernet Controller I225-V (rev 03)
05:00.0 Network controller: Intel Corporation Wi-Fi 6 AX210/AX211/AX411 160MHz (rev 1a)
06:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 02)

bool locatedOnRemovableDevice(QString const& path) {
   return path.startsWith(QStringLiteral("/media/"));
}

//Qt 5.12.1
#include <QApplication>
#include <QMdiArea>
#include <QMdiSubWindow>
#include <QLabel>


class MdiArea: public QMdiArea
{
public:
    MdiArea(QWidget *parent=nullptr): QMdiArea(parent)
    {
        subWindow1=new QMdiSubWindow();
        subWindow1->setWidget(new QLabel("subWindow1"));
        this->addSubWindow(subWindow1);

        subWindow2=new QMdiSubWindow(this);
        subWindow2->setWidget(new QLabel("subWindow2"));

        labelSubWindow1= new QLabel("labelSubWindow1");
        this->addSubWindow(labelSubWindow1);

        labelSubWindow2= new QLabel("labelSubWindow2", this);
        labelSubWindow2->setAttribute(Qt::WA_DeleteOnClose, false);
        this->addSubWindow(labelSubWindow2);

        //посмотрим удаляются ли окна при их закрытии
        connect(subWindow1, &QWidget::destroyed, this, &MdiArea::onSubWindow1Destroyed);
        connect(subWindow2, &QWidget::destroyed, this, &MdiArea::onSubWindow2Destroyed);
        connect(labelSubWindow1, &QWidget::destroyed, this, &MdiArea::labelSubWindow1Destroyed);
        connect(labelSubWindow2, &QWidget::destroyed, this, &MdiArea::labelSubWindow2Destroyed);
    }
private slots:
    void onSubWindow1Destroyed()//такого случаться не должно и не случается
    {
        QLabel *l=new QLabel("subWindow1 is destroyed");
        l->setAttribute(Qt::WA_DeleteOnClose);
        l->show();
    }
    void onSubWindow2Destroyed()//такого случаться не должно и не случается
    {
        QLabel *l=new QLabel("subWindow2 is destroyed");
        l->setAttribute(Qt::WA_DeleteOnClose);
        l->show();
    }
    void labelSubWindow1Destroyed()//такого случаться не должно, но это присходит при закрытии
    {
        QLabel *l=new QLabel("labelSubWindow1 is destroyed");
        l->setAttribute(Qt::WA_DeleteOnClose);
        l->show();
    }
    void labelSubWindow2Destroyed()//такого случаться тем более не должно, но все-равно это присходит при закрытии
    {
        QLabel *l=new QLabel("labelSubWindow2 is destroyed");
        l->setAttribute(Qt::WA_DeleteOnClose);
        l->show();
    }
private:
    QMdiSubWindow *subWindow1, *subWindow2;
    QLabel *labelSubWindow1, *labelSubWindow2;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MdiArea w;
    w.show();
    return a.exec();
}