Hello! As reported by John Williams and others like in http://www.mail-archive.com/linux-ide@xxxxxxxxxxxxxxx/msg03088.html I too have a problem with 2.6.20.1 using ata_piix not detecting the CD-ROM any more. Applying the patch from http://lkml.org/lkml/2007/2/12/24 did not help, but additionally applying http://readlist.com/lists/vger.kernel.org/linux-kernel/45/228948.html made it work. Here's the relevant extra debugging output: ata_piix 0000:00:1f.1: version 2.00ac7 ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 17 PCI: Setting latency timer of device 0000:00:1f.1 to 64 ata1: PATA max UDMA/100 cmd 0x1F0 ctl 0x3F6 bmdma 0x2800 irq 14 ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x2808 irq 15 scsi0 : ata_piix ata1.00: ATA-7, max UDMA/133, 160086528 sectors: LBA ata1.00: ata1: dev 0 multi count 16 ata1.00: configured for UDMA/100 scsi1 : ata_piix ata2.00: ATAPI, max UDMA/33 ata2: ata_altstatus take 4us ata2.00: configured for UDMA/33 scsi 0:0:0:0: Direct-Access ATA Maxtor 6Y080L0 YAR4 PQ: 0 ANSI: 5 SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB) sda: Write Protect is off sda: Mode Sense: 00 3a 00 00 SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB) sda: Write Protect is off sda: Mode Sense: 00 3a 00 00 SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA sda: sda1 sda2 sda3 < sda5 sda6 sda7 sda8 sda9 sda10 sda11 sda12 > sda4 sd 0:0:0:0: Attached scsi disk sda scsi 1:0:0:0: CD-ROM LITE-ON LTR-48246S SID4 PQ: 0 ANSI: 5 sr0: scsi3-mmc drive: 230x/48x writer cd/rw xa/form2 cdda tray Uniform CD-ROM driver Revision: 3.20 sr 1:0:0:0: Attached scsi CD-ROM sr0 Something other I should try to get this fixed for 2.6.20.2+? BYtE Philipp -- / / (_)__ __ ____ __ Philipp Hahn / /__/ / _ \/ // /\ \/ / /____/_/_//_/\_,_/ /_/\_\ pmhahn@xxxxxxxxxxxxx - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html