On Mon, 17 May 2010 18:27:48 +0200, Kay Sievers wrote: > On Mon, May 17, 2010 at 14:43, Nick Bowler <nbowler@xxxxxxxxxxxxxxxx> > wrote: >> On 12:06 Mon 17 May , Kay Sievers wrote: >>> To make sure you don't have any other stuff accessing the device, >>> can you please attach the output of: >>> udevadm test /class/block/sr0 >>> so we can make sure it's nothing we don't think of. >> >> Appended. > > Loos all fine and with the usual behavior so far. > >>> To narrow down the blkid issue, if you comment out the rule, and let >>> the drive spin down, then run: >>> /sbin/blkid -p -oudev /dev/sr0 >>> manually, do you see while doing that any events generated in: >>> udevadm monitor >>> ? >> >> The command causes the cd to spin up, but nothing is printed by >> udevadm monitor as a result. > > Ok, and if you enable the blkid rules again, then you see events in > the monitor? Sorry, the above statement that udevadm monitor prints nothing was a lie! (I must have been insane and/or lacking in coffee first thing in the morning). With the rules commented out, the command /sbin/blkid -p -oudev /dev/sr0 on the non-spinning drive causes three distinct bursts of events to occur: (a) First, immediately after the disk spins up (and blkid prints stuff) KERNEL[1274136271.742645] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0 (scsi) KERNEL[1274136271.743204] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 (block) UDEV [1274136271.743255] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0 (scsi) UDEV [1274136271.792800] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 (block) (b) Then, after a few seconds the disk spins down, but it's still humming: KERNEL[1274136276.306739] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0 (scsi) KERNEL[1274136276.307182] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 (block) UDEV [1274136276.307295] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0 (scsi) UDEV [1274136276.353864] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 (block) (c) Finally, after a few more seconds the drive totally shuts up: KERNEL[1274136304.187396] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0 (scsi) KERNEL[1274136304.187954] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 (block) UDEV [1274136304.188004] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0 (scsi) UDEV [1274136304.231548] change /devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 (block) -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
