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SubjectRe: Problems detecting CDROM on a Dell laptop
Kjartan Maraas wrote:
>
> Hi.
>

Haven't heard anything from Dell support, so I'm
following up here with some more info.

After thinking it was a problem that stemmed from
a BIOS upgrade, I downgraded to the version I had before.

Surprisingly this didn't work and suddenly I remembered
that I had also done a firmware upgrade. :)

This is probably not that easy to downgrade.

>
> from dmesg (without hdc=cdrom):
>
> Uniform Multi-Platform E-IDE driver Revision: 6.30
> PIIX4: IDE controller on PCI bus 00 dev 39
> PIIX4: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0x0860-0x0867, BIOS settings: hda:DMA, hdb:pio
> ide1: BM-DMA at 0x0868-0x086f, BIOS settings: hdc:pio, hdd:pio
> hda: IBM-DADA-26480, ATA DISK drive
> ide2: ports already in use, skipping probe

Why does it report itself as ide2: ? Wouldn't ide1 be more
logical since this is a laptop with just a HD and a CDROM?

>
> With hdc=cdrom I get the following:
>
> Jan 23 09:29:54 km-lt kernel: PIIX4: not 100% native mode: will probe
> irqs later
> Jan 23 09:29:54 km-lt kernel: ide0: BM-DMA at 0x0860-0x0867, BIOS
> settings: hda:DMA, hdb:pio
> Jan 23 09:29:54 km-lt kernel: ide1: BM-DMA at 0x0868-0x086f, BIOS
> settings: hdc:pio, hdd:pio
> Jan 23 09:29:54 km-lt kernel: hda: IBM-DADA-26480, ATA DISK drive
> Jan 23 09:29:54 km-lt kernel: hdc: IRQ probe failed (0)
> Jan 23 09:29:54 km-lt kernel: hdc: IRQ probe failed (0)
> Jan 23 09:29:54 km-lt kernel: hdd: IRQ probe failed (0)
> Jan 23 09:29:54 km-lt kernel: hdd: IRQ probe failed (0)
> Jan 23 09:29:54 km-lt kernel: ide2: ports already in use, skipping probe
> Jan 23 09:29:54 km-lt kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> Jan 23 09:29:54 km-lt kernel: hda: IBM-DADA-26480, 6194MB w/460kB Cache,
> CHS=789/255/63

Cheers
Kjartan Maraas

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