In piix.c (and in ata_piix.c) are already included some patches to skip the cable check on some laptops and to enable UDMA>33 modes, but I've noticed than theese doesn't work on my Acer Aspire 5602WLMi (maybe exist more versions of this laptop).
With this simple patch i can set transfert mode to UDMA100
--- linux-source-2.6.23/drivers/ide/pci/piix.c 2007-10-09 22:31:38.000000000 +0200
+++ linux-2.6.23/drivers/ide/pci/piix.c 2007-10-25 22:25:53.000000000 +0200
@@ -405,6 +405,7 @@
static const struct ich_laptop ich_laptop[] = {
/* devid, subvendor, subdev */
+ { 0x27DF, 0x1025, 0x0102 }, /* ICH7 on Acer 5602aWLMi */
{ 0x27DF, 0x0005, 0x0280 }, /* ICH7 on Acer 5602WLMi */
{ 0x27DF, 0x1025, 0x0110 }, /* ICH7 on Acer 3682WLMi */
{ 0x27DF, 0x1043, 0x1267 }, /* ICH7 on Asus W5F */
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