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SubjectRe: IDE CDROM locks the system hard on media error
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Do you have multiple CD/DVD-R/ROM/R's? This happened today to me when I
was installing Myth II and Quake III at the same time.

First CDROM according to "cat /proc/ide/hdc/model" is pretty generic:
ATAPI 48X CDROM

Second CD-RW according to "cat /proc/ide/hdd/model" is a: LITE-ON
LTR-16102B

Some stuff ala syslog:

Dec 24 13:26:33 fux0r kernel: cdrom: open failed.
Dec 24 13:26:45 fux0r kernel: cdrom: open failed.
Dec 24 13:29:22 fux0r su(pam_unix)[27872]: session closed for user root
Dec 24 13:31:25 fux0r kernel: scsi : aborting command due to timeout :
pid 34319, scsi1, channel 0, id 0, lun 0 Read (10) 00 00 00 00 42 00 00
01 00
Dec 24 13:31:25 fux0r kernel: hdc: timeout waiting for DMA
Dec 24 13:31:25 fux0r kernel: ide_dmaproc: chipset supported
ide_dma_timeout func only: 14
Dec 24 13:31:25 fux0r kernel: scsi : aborting command due to timeout :
pid 34321, scsi1, channel 0, id 1, lun 0 Read (10) 00 00 00 c2 e7 00 00
01 00
Dec 24 13:31:26 fux0r kernel: hdc: status timeout: status=0xd0 { Busy }
Dec 24 13:31:26 fux0r kernel: hdc: drive not ready for command
Dec 24 13:31:30 fux0r kernel: hdc: ATAPI reset complete
Dec 24 13:31:31 fux0r kernel: hdc: irq timeout: status=0xc0 { Busy }
Dec 24 13:31:31 fux0r kernel: hdc: ATAPI reset complete

the next thing we see is syslogd restarting (after rebooting)

Thanks,
Brian




On Mon, 2001-12-24 at 13:28, Stanislav Meduna wrote:
> Hello,
>
> > > I am using vanilla 2.4.17, hdc=ide-scsi, my drive is Mitsumi CR-4804TE,
> > > motherboard is Abit BP6 SMP, Intel PIIX4 IDE controller.
> >
> > Does turning off or restricting the DMA mode using either
> > one of these help?
> > hdparm -d0 -c1 /dev/hdc
>
> This seems to help - I tried the most problematic CD several times,
> got the error messages, but it did not froze.
>
> Thanks - I didn't even know that it defaults to DMA on CD-ROMs...
>
> > hdparm -d 1 -X 34 /dev/hdc
>
> This drive cannot do more than mdma1 (at least according to hdparm -i).
>
> Regards
> --
> Stano
>
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