Index: vga_pci.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/vga_pci.c,v
retrieving revision 1.55
diff -u -p -r1.55 vga_pci.c
--- vga_pci.c	7 Jul 2016 06:55:41 -0000	1.55
+++ vga_pci.c	16 Jun 2020 10:37:00 -0000
@@ -230,6 +230,16 @@ vga_pci_attach(device_t parent, device_t
 			    "WARNING: strange BAR @ 0x%02x\n", reg);
 	}
 
+	/*
+	 * Disable INTx interrupts until a chipset driver is loaded for
+	 * this PCI device. Else unhandled display adapter interrupts
+	 * might freeze the CPU.
+	 */
+	pcireg_t cmd  = pci_conf_read(pa->pa_pc, pa->pa_tag,
+	    PCI_COMMAND_STATUS_REG);
+	pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
+	    cmd | PCI_COMMAND_INTERRUPT_DISABLE);
+
 	/* XXX Expansion ROM? */
 
 	vga_common_attach(sc, pa->pa_iot, pa->pa_memt, WSDISPLAY_TYPE_PCIVGA,