Comment 21 for bug 112132

The error still exists for me. Although now it does not fail to boot, it just takes a considerably longer time. It takes 3 to 4 minutes to boot, as opposed to 1 to 1.5 minutes to boot. The error has changed now. While for me it used to be

ata2.01: failed to set xfermode (err-mask= 0x4)

the error has now become

[51.399855] ata2.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[51.399923] ata2.01: cmd a0/01:00:00:00:00/00:00:00:00:00/b0 tag 0cdb 0x5a data 128 in

then about every 40 seconds the error shows up exactly the same again, until after 4 or 5 times, the system boots up, and the CD Drive does not respond to anything.