Comment 37 for bug 379831

Hi,

I own an Acer Aspire Timeline 1810TZ and had the same problem. The 2.6.32rc6 kernel didn't solve the problem for me, but I just had to change the hard-coded model 3810T to 1810TZ in the file drivers/ata/ahci.c like this:

static void ahci_gtf_filter_workaround(struct ata_host *host)
{
 static const struct dmi_system_id sysids[] = {
  /*
   * Aspire 3810T issues a bunch of SATA enable commands
   * via _GTF including an invalid one and one which is
   * rejected by the device. Among the successful ones
   * is FPDMA non-zero offset enable which when enabled
   * only on the drive side leads to NCQ command
   * failures. Filter it out.
   */
  {
   .ident = "Aspire 1810TZ",
   .matches = {
    DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
    DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1810TZ"),
   },
   .driver_data = (void *)ATA_ACPI_FILTER_FPDMA_OFFSET,
  },
  { }
 };

Then it worked great! There is a sensible performance improvement in the boot time!

Thank you very much, I hope the kernel guys figure out a more generic way to fix this.

Best regards
Mello