Comment 1 for bug 36998

I also have a ThinkPad r30, though I encountered the problem with the Dapper Live Flight 5 CD. I did not encounter this on the released Breezy Live CD. Using the "irqpoll" feature does allow the live CD to boot to the desktop, though not without complaints (which I'll get to later).

Without the "irqpoll" boot option the following information is dumped to the screen:
[4294743.696000] irq 15: nobody cared (try booting with the "irqpoll" option)
[4294743.696000] handlers:
[4294743.696000] [<c0251160>] (ide_intr+0x0/0x200)
[4294743.696000] Disabled IRQ #15
On one occation this was preceeded by lots of "/dev/hdc: error 2"

Using the "irqpoll" for a successful boot gets the following information dumped in dmesg:
[4294676.984000] ALI15X3: IDE controller at PCI slot 0000:00:10.0
[4294676.984000] ACPI: PCI Interrupt 0000:00:10.0[A]: no GSI - using IRQ 15
[4294676.984000] PCI: setting IRQ 15 as level-triggered
[4294676.984000] ALI15X3: chipset revision 195
[4294676.984000] ALI15X3: not 100% native mode: will probe irqs later
[4294676.984000] ide0: BM-DMA at 0x7050-0x7057, BIOS settings: hda:DMA, hdb:pio
[4294676.984000] ide1: BM-DMA at 0x7058-0x705f, BIOS settings: hdc:DMA, hdd:pio
[4294676.984000] Probing IDE interface ide0...
[4294677.248000] hda: HITACHI_DK23CA-30, ATA DISK drive
[4294677.860000] ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
[4294677.860000] Probing IDE interface ide1...
[4294678.532000] hdc: HITACHI DVD-ROM GD-S250, ATAPI CD/DVD-ROM drive
[4294683.064000] irq 15: nobody cared (try booting with the "irqpoll" option)
[4294683.064000] [<c013e922>] __report_bad_irq+0x22/0x80
[4294683.064000] [<c013ea18>] note_interrupt+0x68/0xc0
[4294683.064000] [<c013e2dc>] __do_IRQ+0xbc/0xe0
[4294683.064000] [<c010597a>] do_IRQ+0x1a/0x30
[4294683.064000] [<c01040ea>] common_interrupt+0x1a/0x20
[4294683.064000] [<c0121520>] __do_softirq+0x30/0xb0
[4294683.064000] [<c01215d5>] do_softirq+0x35/0x40
[4294683.064000] [<c0121685>] irq_exit+0x35/0x40
[4294683.064000] [<c010597f>] do_IRQ+0x1f/0x30
[4294683.064000] [<c01040ea>] common_interrupt+0x1a/0x20
[4294683.064000] [<c013e55c>] setup_irq+0x9c/0x120
[4294683.064000] [<c0251160>] ide_intr+0x0/0x200
[4294683.064000] [<c013e73b>] request_irq+0x7b/0xa0
[4294683.064000] [<c0255318>] init_irq+0x308/0x4b0
[4294683.064000] [<c0251160>] ide_intr+0x0/0x200
[4294683.064000] [<c0255973>] hwif_init+0xe3/0x2b0
[4294683.064000] [<c0254e2f>] probe_hwif_init_with_fixup+0x1f/0x90
[4294683.064000] [<c02589a3>] ide_setup_pci_device+0x93/0xa0
[4294683.064000] [<c01e666c>] __pci_device_probe+0x3c/0x60
[4294683.064000] [<c01e66af>] pci_device_probe+0x1f/0x40
[4294683.064000] [<c0243062>] driver_probe_device+0x32/0xa0
[4294683.064000] [<c0243140>] __driver_attach+0x0/0x40
[4294683.064000] [<c024317b>] __driver_attach+0x3b/0x40
[4294683.064000] [<c0242748>] bus_for_each_dev+0x48/0x80
[4294683.064000] [<c0243195>] driver_attach+0x15/0x20
[4294683.064000] [<c0243140>] __driver_attach+0x0/0x40
[4294683.064000] [<c0242be9>] bus_add_driver+0x69/0xc0
[4294683.064000] [<c01e68fa>] __pci_register_driver+0x6a/0xa0
[4294683.064000] [<d807d5cf>] ali15x3_ide_init+0xf/0x14 [alim15x3]
[4294683.064000] [<c01381cf>] sys_init_module+0x9f/0x1d0
[4294683.064000] [<c0103089>] syscall_call+0x7/0xb
[4294683.064000] handlers:
[4294683.064000] [<c0251160>] (ide_intr+0x0/0x200)
[4294683.064000] Disabling IRQ #15
[4294683.065000] ide1 at 0x170-0x177,0x376 on irq 15
[4294683.094000] hda: max request size: 128KiB
[4294683.562000] hda: 58605120 sectors (30005 MB) w/2048KiB Cache, CHS=58140/16/63, UDMA(33)
[4294683.562000] hda: cache flushes not supported
[4294683.562000] hda: hda1
[4294683.576000] hdc: ATAPI 24X DVD-ROM drive, 512kB Cache, UDMA(33)
[4294683.576000] Uniform CD-ROM driver Revision: 3.20
...a bit later...
[4294750.787000] hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x01)