CD-ROMs not working in 2.6

[Antony Gelberg <antony@antgel.co.uk>]

Hi all,

I'd appreciate a CC as I'm not subbed.

I'm running 2.6.0 from the Debian source packages.  All is good, except
my CDROM drives don't work.  Here's some relevant output from
/var/log/dmesg:

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
VP_IDE: IDE controller at PCI slot 0000:00:11.1
ACPI: No IRQ known for interrupt pin A of device 0000:00:11.1 - using
IRQ 255
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx
VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci0000:00:11.1
    ide0: BM-DMA at 0x8800-0x8807, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0x8808-0x880f, BIOS settings: hdc:DMA, hdd:pio
hdc: 54X CD-ROM, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
end_request: I/O error, dev hdc, sector 0
hdc: ATAPI 52X CD-ROM drive, 128kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12
libata version 0.81 loaded.
sata_promise version 0.86
ata1: SATA max UDMA/133 cmd 0xE0824200 ctl 0xE0824238 bmdma 0x0 irq 17
ata2: SATA max UDMA/133 cmd 0xE0824280 ctl 0xE08242B8 bmdma 0x0 irq 17

Now lspci:
00:11.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 06)

Can anyone shed any light on this?  I've tried a different IDE cable.  I
disconnected the other drive that was the slave, but no dice.  hdc and
hdd both reported the I/O error when they were both connected.  The
system doesn't recognise data or audio discs.

I won't post my kernel config without request as it's 1151 lines long.

A