acertimeline team mailing list archive

[Alex <red-naxela@xxxxxxx>]

Hi everybody!

For those who would like to have the AHCI option in the bios enabled 
(for parallel Vista for example) rather than "IDE mode":

I found out that it is also possible to use the libata option 
"force=noncq". It may be implemented under Debian (and Ubuntu perhaps 
too, I don't have it so please verify) by adding the line

libata force=noncq

to the file "/etc/initramfs-tools/modules" and then doing a 
"update-initramfs -u".
Further more I created a new file "options.conf" in the directory 
"/etc/modprobe.d" with the line

options libata force=noncq

in it and then rebooted. My linux then booted without the mysterious 
SATA errors in AHCI mode. I have a Hitachi Disk HTS545032B9A300 in my 3810T.

I don't know which option is better "libata noacpi=1" or "libata 
force=noncq". Found the clue for disabling NCQ on a website: 
http://lkml.indiana.edu/hypermail/linux/kernel/0706.1/0237.html 
.Probably not all hard disk drives support the NCQ (Native command 
queuing, see Wikipedia 
http://en.wikipedia.org/wiki/Native_command_queuing). If someone knows 
more, thanks for telling me.

Remark: For adding the kernel boot parameters it did not work for me to 
just add "libata.force=noncq" or "libata.noacpi=1" to the grub 
parameters. It did not recognize the option and ignored it. This is why 
I did the "more complicated" way described above, works also if you 
prefer using the noacpi=1 variant.

Best regards
Alex