Difficulty playing DVDs under AHCI/CAM?

[Sean C. Farley]

On Sun, 29 Aug 2010, Buganini wrote:

> BTW, it seems that DVD burning with ahci is broken, burning a CD is 
> okay, but I never burn a DVD sucessfully with ahci.  Always get 
> somethings like "unable to write at 60H input/output error" and many 
> "(cd0:ahcich2:0:0:0): SCSI sense: ILLEGAL REQUEST csi:43,0,0,c 
> asc:24,0 (Invalid field in CDB): Command byte 6 is invalid" in dmesg,
>
> With ahci unloaded, I see "(cd0:ata4:0:0:0): SCSI sense: ILLEGAL 
> REQUEST csi:43,0,0,c asc:24,0 (Invalid field in CDB): Command byte 6 
> is invalid" once, but it works.
>
> But I can read data DVD with ahci and sucessfully verify data with 
> diff.

While I have not had time to narrow it down, I have also had problems 
with burning DVD+R on my drive (LITE-ON DVDRW LH-20A1S 9L09) with the 
ahci driver on 8-STABLE using cdrecord.  However, CD-RW's and DVD+RW's 
are not a problem.  At the beginning of a failed burn, it seems like 
there is a short pause near the beginning (maybe after a block or two 
has been written, but I do not recall).

If I find time, I will try again to burn a disc along with collecting 
all the debugging information I can.

One thing I need to try, and you may too, is to see if there are any 
firmware updates for the drive.  I see there is one for mine which I 
will try.  Unfortunately, it does not say on the site what it improves 
unless the "Match more media" is it.

Sean
-- 
scf at FreeBSD.org