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Re: mounted data dvds not read correctly

I just remembered hdparm, and used it to turn DMA off on the dvd drive.
The drive works fine that way. I conclude that there is a problem with
use of UDMA(33) mode on this drive.

I will file a bug.

Steve Schwarz

On Sun, 2006-05-21 at 17:33 -0700, Steven Schwarz wrote:
> I recently became aware that there is something going wrong when I
> mount data dvds on my fedora core 4 system. I became aware of this
> using a data dvd rom that contains some software from Sun. I have
> tested that the dvd is ok by using another system. The symptom is that
> when I mount this dvd and try to compute checksums of files on it I
> get a different random answer on each mount. There are no signs of
> trouble as the system boots -- here is the relevant section
> of /var/log/dmesg:
>         ide: Assuming 33MHz system bus speed for PIO modes; override
>         with idebus=xx
>         ICH6: IDE controller at PCI slot 0000:00:1f.1
>         ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) ->
>         IRQ 193
>         ICH6: chipset revision 3
>         ICH6: not 100% native mode: will probe irqs later
>             ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA,
>         hdb:DMA
>         Probing IDE interface ide0...
>         hda: HP DVD Writer 640b, ATAPI CD/DVD-ROM drive
>         hdb: ASUS CD-S480/AH, ATAPI CD/DVD-ROM drive
>         ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
>         Probing IDE interface ide1...
>         hda: ATAPI 40X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache,
>         UDMA(33)
>         Uniform CD-ROM driver Revision: 3.20
>         hdb: ATAPI 48X CD-ROM drive, 128kB Cache, UDMA(33)
> If it matters, the system is an hp pavilions desktop model a820n.
> As far as I can see, video dvds play fine on the same dvd drive.
> There are no messages produced to either dmesg or to /var/log/messages
> when mounting or reading files from the dvd.
> I am running the latest fedora 4 kernel: kernel-smp-2.6.16-1.2108_FC4.
> The problem also occurs with an older fedora 4 kernel:
> kernel-smp-2.6.15-1.1833_FC4.
> Can anyone suggest anything I can do to work around this problem, or
> to track down where it occurs?
> Thanks,
> Steve Schwarz

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