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    Subject[libata] atapi_enabled problem
    Hi,

    I'm a bit puzzled, I have a Fujistu-Siemens P7120 (see:
    http://www.labri.fr/perso/fleury/index.php?page=p7120) and the DVD-ROM
    wasn't detected at all at boot time.

    After googling a bit I found this page:
    http://www.thinkwiki.org/wiki/Problems_with_SATA_and_Linux

    So, I tried to compile the kernel with built-in ATAPI and S-ATA support
    (not as modules but embedded in the kernel) and I tried to pass
    libata.atapi_enabled=1 at boot time through kernel options. The
    DVD-drive was recognized at boot but generate tons of errors:

    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    sr0: CDROM (ioctl) error, command: <6>Test Unit Ready 00 00 00 00 00 00
    sr: Current [descriptor]: sense key: Medium Error
    Additional sense: Unrecovered read error - auto reallocate failed
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51
    ata1: translated ATA stat/err 0x51/20 to SCSI SK/ASC/ASCQ 0x3/11/04
    ata1: no sense translation for error 0x20
    ata1: no sense translation for status: 0x51

    Then I decided to just modify drivers/scsi/libata-core.c changing the
    line "atapi_enabled = 0" into "atapi_enabled = 1". Then everything
    worked as a charm.

    I have no explanation yet for this behaviour (passing kernel options
    should behave the same than changing the code the way I did I suppose).

    Does anyone has an idea ?

    Regards
    --
    Emmanuel Fleury
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