From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830

Description of problem:
Some days ago I installed my brand new RH 8.0 (psyche) OS. Now, in my system I
got one DVD/cdrom drive, one cdrw drive and one zip drive as follows (as per fstab):

LABEL=/          /                   ext3    defaults        1 1
none             /dev/pts            devpts  gid=5,mode=620  0 0
LABEL=/home      /home               ext3    defaults        1 2
none             /proc               proc    defaults        0 0
none             /dev/shm            tmpfs   defaults        0 0
/dev/hda6        swap                swap    defaults        0 0
/dev/hda1	 /mnt/windows        ntfs   auto,umask=0222,ro 0 0
/dev/hdb4        /mnt/zip            auto   noauto,owner,kudzu 0 0
/dev/fd0         /mnt/floppy         auto   noauto,owner,kudzu 0 0
/dev/cdrom1      /mnt/cdrom1         iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom       /mnt/cdrom          iso9660 noauto,owner,kudzu,ro 0 0

of course, /dev/cdrom and /dev/cdrom1 are two symbolic links

[root@localhost root]# ls -l /dev/cdrom*
lrwxrwxrwx    1 root   root   8 dic 30 19:59 /dev/cdrom -> /dev/hdd
lrwxrwxrwx    1 root   root   9 dic 29 21:19 /dev/cdrom1 -> /dev/scd0

When I boot the system up with a cd inside the DVD/cdrom drive, everything goes
smooth.  Here you got the corresponding dmesg section about IDE:

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller on PCI bus 00 dev 39
VP_IDE: chipset revision 16
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt82c686a (rev 22) IDE UDMA66 controller on pci00:07.1
    ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xc008-0xc00f, BIOS settings: hdc:DMA, hdd:DMA
hda: QUANTUM FIREBALLP LM20.5, ATA DISK drive
hdb: IOMEGA ZIP 100 ATAPI Floppy, ATAPI FLOPPY drive
hdc: SHUTTLE, ATAPI CD/DVD-ROM drive
hdd: LG DVD-ROM DRD-8160B, ATAPI CD/DVD-ROM drive
ide2: ports already in use, skipping probe
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 40132503 sectors (20548 MB) w/1900KiB Cache, CHS=2498/255/63, UDMA(66)
ide-floppy driver 0.99.newide
hdb: No disk in drive
hdb: 98304kB, 96/64/32 CHS, 4096 kBps, 512 sector size, 2941 rpm

Now, when I boot up without a cd in my DVD/cdrom drive, it seems that the kernel
have some kind of problem recognizing the drive. Here is the dmesg, in this case:

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller on PCI bus 00 dev 39
VP_IDE: chipset revision 16
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt82c686a (rev 22) IDE UDMA66 controller on pci00:07.1
    ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xc008-0xc00f, BIOS settings: hdc:DMA, hdd:DMA
hda: QUANTUM FIREBALLP LM20.5, ATA DISK drive
hdb: IOMEGA ZIP 100 ATAPI Floppy, ATAPI FLOPPY drive
hdc: SHUTTLE, ATAPI CD/DVD-ROM drive
hdd: LG DVD-ROM DRD-8160B, ATAPI CD/DVD-ROM drive
hdd: set_drive_speed_status: status=0x00 { }
ide1: Drive 1 didn't accept speed setting. Oh, well.
ide2: ports already in use, skipping probe
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 40132503 sectors (20548 MB) w/1900KiB Cache, CHS=2498/255/63, UDMA(66)
ide-floppy driver 0.99.newide
hdb: No disk in drive
hdb: 98304kB, 96/64/32 CHS, 4096 kBps, 512 sector size, 2941 rpm

and ahead

hdd: status error: status=0x00 { }
end_request: I/O error, dev 16:40 (hdd), sector 0
hdd: status error: status=0x00 { }
hdd: status error: status=0x00 { }
hdd: status error: status=0x00 { }
hdd: status error: status=0x00 { }
hdd: ATAPI reset complete
hdd: status error: status=0x00 { }
hdd: status error: status=0x00 { }
hdd: status error: status=0x00 { }
hdd: status error: status=0x00 { }
hdd: ATAPI reset complete
hdd: status error: status=0x00 { }
end_request: I/O error, dev 16:40 (hdd), sector 0

The first group of lines appears also during the boot up sequence. As you can
see there is some kind of drive speed settings problem. At that point the cdrom
drive stop responding. In most cases the drive remains blocked and I can't even
open it. But even when I can insert a data CD inside it the mounting is
impossible. Whatever the mounting command I use, the answer is always "/dev/hdd
(or /dev/cdrom) is not a valid block device".
I even tried to add the following line at the end of kernel section in my grub.conf:
/hdd=ide-scsi
just to see if it will works as scsi emulated drive. Same results.

I reached the limits of my linux knowledge (very limited, to say the truth).
Could somebody help me out?

Thanks in advance for your cooperation.

Version-Release number of selected component (if applicable):


How reproducible:
Sometimes

Steps to Reproduce:
1.Boot system up without any cd in cdrom drive
2.
3.
    

Actual Results:  cdrom become unmountable. The answer is always "not a valid
block device".

Expected Results:  cdrom working normally

Additional info:

See message above