Hello again and sorry for post scriptum. On Tue, 2006-11-14 at 23:04 -0500, Pavel Roskin wrote: > ata2.01: qc timeout (cmd 0xa1) > ata2.01: failed to IDENTIFY (I/O error, err_mask=0x4) ... > Note that with CONFIG_IDE, the hard drive is /dev/hda and DVD > is /dev/hdc, so it's not the secondary interface - it's something else. Closer examination of the code shows that the problem is with the slave on the secondary interface, i.e. /dev/hdd in the IDE driver. Here's one thing I didn't mention. The combo DVD-ROM/CD-RW drive I'm using wasn't native to the laptop. I took it from another Thinkpad - from an older T23 model (and I'm dealing with T30) to replace a native DVD-ROM. That's how the drive is identified: scsi 1:0:0:0: CD-ROM MATSHITA UJDA720 DVD/CDRW 1.03 PQ: 0 ANSI: 5 I swapped the drives back and there is no delay anymore! scsi0 : ata_piix ata1.00: ATA-5, max UDMA/100, 78140160 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 ata2.00: configured for UDMA/33 scsi 0:0:0:0: Direct-Access ATA IC25N040ATCS05-0 CS4O PQ: 0 ANSI: 5 SCSI device sda: 78140160 512-byte hdwr sectors (40008 MB) sda: Write Protect is off SCSI device sda: drive cache: write back SCSI device sda: 78140160 512-byte hdwr sectors (40008 MB) sda: Write Protect is off SCSI device sda: drive cache: write back sda: sda1 sda2 sda3 sda4 sd 0:0:0:0: Attached scsi disk sda sd 0:0:0:0: Attached scsi generic sg0 type 0 scsi 1:0:0:0: CD-ROM MATSHITA DVD-ROM SR-8177 NB21 PQ: 0 ANSI: 5 Likewise, there is no delay if I remove the drive: scsi0 : ata_piix ata1.00: ATA-5, max UDMA/100, 78140160 sectors: LBA ata1.00: ata1: dev 0 multi count 16 ata1.00: configured for UDMA/100 scsi1 : ata_piix scsi 0:0:0:0: Direct-Access ATA IC25N040ATCS05-0 CS4O PQ: 0 ANSI: 5 SCSI device sda: 78140160 512-byte hdwr sectors (40008 MB) There are no jumpers on either drive. I assume they are configured as either master or "cable select". I also tried booting the same kernel on the Thinkpad T23 with the combo drive. I got the same "qc timeout" errors. Thinkpad T23 has the same IDE controller 8086:248a, it's also at 00:1f.1. So the problem has been reduced to Matsushita (Matshita Panasonic) UJDA720 in an IBM Thinkpad blocking detection of empty slave on the same port. It's clearly a regression in libata compared to the IDE driver, and it would be nice to have it fixed. -- Regards, Pavel Roskin - 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
