RELENG_7 problem with playing DVDs

[[LoN]Kamikaze]

[LoN]Kamikaze wrote:
> Olivier Brisson wrote:
> I actually tried with 2 different drives. I can get more detailed, now.
> 
> The drive lockup and dmesg spamming till the system has shut down as I
> reported it only occurs if I try to use the drives through the cam interface
> /dev/cd0 or /dev/cd1. The error message being the same.
> 
> Here is the dmesg boot output concerning the drives:
> atapci0: <Intel ICH2 UDMA100 controller> port
> 0x1f0-0x1f7,0x3f6,0x170-0x177,0x37...skipping...
> acd0: DVDROM <HL-DT-STDVD-ROM GDR8164B/0L06> at ata1-master UDMA33
> acd1: DVDR <HP DVD Writer 840b/FF66> at ata1-slave UDMA33
> acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00
> cd0 at ata1 bus 0 target 0 lun 0
> cd0: <HL-DT-ST DVD-ROM GDR8164B 0L06> Removable CD-ROM SCSI-0 device
> cd0: 33.000MB/s transfers
> cd0: cd present [3799193 x 2048 byte records]
> cd1 at ata1 bus 0 target 1 lun 0
> cd1: <HP DVD Writer 840b FF66> Removable CD-ROM SCSI-0 device
> cd1: 33.000MB/s transfers
> cd1: cd present [3793882 x 2048 byte records]
> 
> If I use the acd0 device mplayer just fails because of failed CSS-key
> cracking. The dmesg gets a couple of lines with:
> ata1: FAILURE - non aligned DMA transfer attempted
> acd0: setting up DMA failed
> acd0: FAILURE - REPORT_KEY ILLEGAL REQUEST asc=0x6f ascq=0x04
> 
> If I use the acd1 device there are no dmesg reports and the dvd plays, but
> very poorly, as if the drive was in PIO mode. I checked my BIOS settings and
> all the usual suspects like block-reading, DMA and so on are turned on.

I now turned of the AUTO detection and hand-configured the devices. Now acd1
also reports the same DMA failure.