Comment 70 for bug 110636

I kind solved my problem temporally:

I added Hardy repositories and installed only 2.6.24-21-generic.
I started with that kernel and my sd* became hd* and all the information/tune-up of hdparm
works just fine.

NOW:

/dev/hda:
 Timing cached reads: 918 MB in 2.00 seconds = 458.69 MB/sec
 Timing buffered disk reads: 98 MB in 3.10 seconds = 31.58 MB/sec

And not just that, now my DVD burner in K3B can burn at 4x (before was < 1x).

I will look forward to solve my problem in 2.6.27

P.S. I also tried to install kernel 2.6.28 from jaunty repos but the performance was even worst!