1) add to the end of io_apic.c:

static void print_line(struct IO_APIC_route_entry* entry)
{
	printk(KERN_EMERG " %02x %03X %02X  ",
			0,
			entry->dest.logical.logical_dest,
			entry->dest.physical.physical_dest
		);

	printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
			entry->mask,
			entry->trigger,
			entry->irr,
			entry->polarity,
			entry->delivery_status,
			entry->dest_mode,
			entry->delivery_mode,
			entry->vector
		);
}

void kick_IOAPIC_pin(int pin)
{
    	unsigned long flags;
	struct IO_APIC_route_entry entry;

	local_irq_save(flags);

	*(((int *)&entry) + 1) = io_apic_read(0, 0x11 + 2 * pin);
	*(((int *)&entry) + 0) = io_apic_read(0, 0x10 + 2 * pin);

	printk(KERN_EMERG " NR Log Phy Mask Trig IRR Pol"
			  " Stat Dest Deli Vect:   \n");
	printk(KERN_EMERG "Before:\n");
	print_line(&entry);

	entry.trigger = 0;
	io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry) + 1));
	io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry) + 0));
	udelay(10);
	printk(KERN_EMERG "After switching to edge:\n");
	print_line(&entry);

	entry.trigger = 1;
	io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry) + 1));
	io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry) + 0));
	udelay(10);
	printk(KERN_EMERG "After switch back:\n");
	print_line(&entry);

	local_irq_restore(flags);
}

2) add to sysrq.c:
--- 2.4/drivers/char/sysrq.c	Mon Dec  4 02:48:19 2000
+++ build-2.4/drivers/char/sysrq.c	Fri Jan 12 18:37:57 2001
@@ -137,6 +137,9 @@
 		send_sig_all(SIGKILL, 1);
 		orig_log_level = 8;
 		break;
+	case 'q':
+		kick_IOAPIC_pin(19);
+
 	default:					    /* Unknown: help */
 		if (kbd)
 			printk("unRaw ");