--- sound/pci/hda/hda_intel.orig.c	2007-07-13 00:10:25.000000000 +0100
+++ sound/pci/hda/hda_intel.c	2007-07-13 00:11:18.000000000 +0100
@@ -1086,6 +1086,18 @@
 	unsigned long flags;
 	int err;
 
+ /* patch to fix error for kernel 2.6.20 where SMP CPUs are started after PCI devices
+    and over-write the value of the TCSEL register, causing DMA buffer looping and static
+    For details see https://bugs.launchpad.net/ubuntu/+bug/100114
+ */
+ unsigned char reg;
+ pci_read_config_byte(chip->pci, ICH6_PCIREG_TCSEL, &reg);
+ if (reg != 0) {
+ 	pci_write_config_byte(chip->pci, ICH6_PCIREG_TCSEL, reg & 0xf8);
+  snd_printk(KERN_WARNING SFX "BUG: PCI register TCSEL=%d, resetting to zero (see Ubuntu bug #100114)\n", reg);
+ }
+ /* end of patch */
+
 	mutex_lock(&chip->open_mutex);
 	azx_dev = azx_assign_device(chip, substream->stream);
 	if (azx_dev == NULL) {