I have a similar problem in a related but different situation. My experience doesn't quite help you with the specific investigation of this case but may serve as a weak confirmation that this is indeed a kernel issue.
Similarities * same hardware: ThinkPad X220 Tablet with an Ultrabase docking station; the tablet doesn't make a difference wrt. docking * same symptoms: disk not recognized Differences: * I'm running Gentoo Linux with kernel 3.4.11 (original version plus a few Gentoo-specific patches, i.e. the package gentoo-sources) vs. 3.6.1. * I think connecting a USB hard disk to the docking station worked with both kernels, but what stopped working in my case is attaching a hard disk via the SATA to Ultrabay adapter. With kernel 3.4.11 I get the following log messages: Oct 10 18:35:15 CLANGE-x220t kernel: [ 4301.613989] ACPI: \_SB_.PCI0.SAT1.PRT1 - docking Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.356799] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.359664] ata2.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.359675] ata2.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.362030] ata2.00: ATA-8: ST9500420ASG, 0002SDM1, max UDMA/133 Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.362039] ata2.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32) Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.365187] ata2.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.365190] ata2.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out Oct 10 18:35:18 CLANGE-x220t kernel: [ 4305.367510] ata2.00: configured for UDMA/133 Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.378761] ata2: EH complete Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.378890] scsi 1:0:0:0: Direct-Access ATA ST9500420ASG 0002 PQ: 0 ANSI: 5 Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.379009] sd 1:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB) Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.379052] sd 1:0:0:0: [sdb] Write Protect is off Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.379055] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00 Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.379072] sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.379206] sd 1:0:0:0: Attached scsi generic sg1 type 0 Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.405429] sdb: sdb1 sdb2 Oct 10 18:35:19 CLANGE-x220t kernel: [ 4305.405788] sd 1:0:0:0: [sdb] Attached SCSI disk But with 3.6.1: Oct 10 17:21:00 CLANGE-x220t kernel: [63577.233313] ACPI: \_SB_.PCI0.SAT1.PRT1 - docking <and then nothing else happens> -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1052064 Title: External USB hard disks are not seen when connected to docking station To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1052064/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs