I'm having the same problem with the stable maverick kernel:

~$ uname -a
Linux thinkpad 2.6.35-27-generic #48-Ubuntu SMP Tue Feb 22 20:25:46 UTC 2011 x86_64 GNU/Linux

~$ cat /proc/version_signature 
Ubuntu 2.6.35-27.48-generic 2.6.35.11

When booted in the docking station, suspend fails both while in the docking station and while undocked from the docking station. If I boot the laptop outside of the docking station, suspend works fine. Disabling the serial and parallel port in the BIOS fixes the problem, but I would like to be able to use the serial port and parallel port on the docking station.

Here is the dmesg output from a failed attempt:
[277157.770373] Freezing user space processes ... (elapsed 0.02 seconds) done.
[277157.792612] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
[277157.812576] PM: Entering mem sleep
[277157.812614] Suspending console(s) (use no_console_suspend to debug)
[277157.850381] sd 2:0:0:0: [sda] Synchronizing SCSI cache
[277157.850828] sd 2:0:0:0: [sda] Stopping disk
[277157.920230] serial 00:0a: disable failed
[277157.920238] legacy_suspend(): pnp_bus_suspend+0x0/0x90 returns -5
[277157.920245] PM: Device 00:0a failed to suspend: error -5
[277158.430300] PM: suspend of drv:sd dev:2:0:0:0 complete after 579.946 msecs
[277158.430344] PM: suspend of drv:scsi dev:target2:0:0 complete after 579.939 msecs
[277158.430359] PM: suspend of drv:scsi dev:host2 complete after 579.908 msecs
[277158.430374] PM: Some devices failed to suspend
[277158.430708] sd 2:0:0:0: [sda] Starting disk
[277158.562140] PM: resume of drv:usb dev:5-2 complete after 131.410 msecs
[277158.562152] PM: resume of drv:usbhid dev:5-2:1.1 complete after 131.296 msecs
[277158.562164] PM: resume of drv:usbhid dev:5-2:1.0 complete after 131.397 msecs
[277158.590514] PM: resume of drv:usb dev:1-4.2 complete after 159.269 msecs
[277158.590526] PM: resume of drv:hub dev:1-4.2:1.0 complete after 159.225 msecs
[277158.590780] PM: resume of drv:usb dev:1-4.1 complete after 159.654 msecs
[277158.590807] PM: resume of drv:hub dev:1-4.1:1.0 complete after 159.612 msecs
[277158.650263] PM: resume of drv:usb dev:1-4.2.1 complete after 218.812 msecs
[277158.650297] PM: resume of drv:usblp dev:1-4.2.1:1.0 complete after 218.790 msecs
[277158.652021] PM: resume of drv:usb dev:1-4.1.3 complete after 220.656 msecs
[277158.652048] PM: resume of drv:hub dev:1-4.1.3:1.0 complete after 220.676 msecs
[277158.711291] PM: resume of drv:usb dev:1-4.1.3.1 complete after 279.726 msecs
[277158.711303] PM: resume of drv:usbhid dev:1-4.1.3.1:1.1 complete after 279.627 msecs
[277158.711320] PM: resume of drv:usbhid dev:1-4.1.3.1:1.0 complete after 279.702 msecs
[277159.585389] IBM TrackPoint firmware: 0x0e, buttons: 3/3
[277159.603615] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/input/input27
[277159.622617] PM: resume of drv:sd dev:2:0:0:0 complete after 1191.940 msecs
[277159.622632] PM: resume of drv:scsi_disk dev:2:0:0:0 complete after 1116.401 msecs
[277159.622645] PM: resume of drv:scsi_device dev:2:0:0:0 complete after 1191.947 msecs
[277159.770056] PM: resume of drv:pcmcia_socket dev:pcmcia_socket0 complete after 147.324 msecs
[277159.773290] PM: resume of devices complete after 1342.911 msecs
[277159.773473] PM: resume devices took 1.340 seconds
[277159.773493] PM: Finishing wakeup.
[277159.773495] Restarting tasks ... done.
[277159.776364] video LNXVIDEO:00: Restoring backlight state
[277159.956612] Skipping EDID probe due to cached edid
[277160.300400] e1000e 0000:00:19.0: irq 43 for MSI/MSI-X
[277160.352816] e1000e 0000:00:19.0: irq 43 for MSI/MSI-X
[277160.354054] ADDRCONF(NETDEV_UP): eth0: link is not ready
[277160.630068] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[277161.746060] EXT4-fs (sda6): re-mounted. Opts: errors=remount-ro,commit=0
[277161.750872] EXT4-fs (sda1): re-mounted. Opts: commit=0
[277161.835832] EXT4-fs (sda7): re-mounted. Opts: commit=0
[277162.211052] e1000e: eth0 NIC Link is Up 10 Mbps Half Duplex, Flow Control: None
[277162.211122] e1000e 0000:00:19.0: eth0: Autonegotiated half duplex but link partner cannot autoneg.  Try forcing full duplex if link gets many collisions.
[277162.211131] e1000e 0000:00:19.0: eth0: 10/100 speed: disabling TSO
[277162.213285] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[277164.401491] wlan0: authenticate with 1c:af:f7:d0:63:41 (try 1)
[277164.403343] wlan0: authenticated
[277164.403409] wlan0: associate with 1c:af:f7:d0:63:41 (try 1)
[277164.407506] wlan0: RX AssocResp from 1c:af:f7:d0:63:41 (capab=0x431 status=0 aid=1)
[277164.407514] wlan0: associated
[277164.451286] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready