I am also having this issue running linux-image-3.0.0-21-generic.

I note that I am using a SSD not a hard disk, dmesg gives me (Note: the CIFS errors are because I try to mount a NAS box before the network is fully up but mount points are just fine a few moments later):

[    0.957613] registered taskstats version 1
[    0.976891]   Magic number: 4:638:75
[    0.976997] rtc_cmos 00:03: setting system clock to 2012-07-26 11:05:02 UTC (1343300702)
[    0.977838] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[    0.977840] EDD information not available.
[    0.988176] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2
[    1.242567] ata3: SATA link down (SStatus 0 SControl 300)
[    1.253118] ata4: SATA link down (SStatus 0 SControl 300)
[    1.416056] Refined TSC clocksource calibration: 2925.999 MHz.
[    1.416063] Switching to clocksource tsc
[    1.570663] ata2.00: SATA link down (SStatus 0 SControl 300)
[    1.570674] ata2.01: SATA link down (SStatus 0 SControl 300)
[    1.632019] usb 7-2: new full speed USB device number 2 using uhci_hcd
[    1.716069] ata1.00: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    1.716081] ata1.01: SATA link down (SStatus 0 SControl 300)
[    1.740534] ata1.00: ATA-8: OCZ-AGILITY3, 2.15, max UDMA/133
[    1.740538] ata1.00: 175836528 sectors, multi 16: LBA48 NCQ (depth 0/32)
[    1.772496] ata1.00: configured for UDMA/133
[    1.772671] scsi 0:0:0:0: Direct-Access     ATA      OCZ-AGILITY3     2.15 PQ: 0 ANSI: 5
[    1.772792] sd 0:0:0:0: [sda] 175836528 512-byte logical blocks: (90.0 GB/83.8 GiB)
[    1.772837] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    1.772846] sd 0:0:0:0: [sda] Write Protect is off
[    1.772848] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    1.772866] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    1.773542]  sda: sda1 sda2 < sda5 >
[    1.773799] sd 0:0:0:0: [sda] Attached SCSI disk
[    1.773882] Freeing unused kernel memory: 724k freed
[    1.774100] Write protecting the kernel text: 5536k
[    1.774174] Write protecting the kernel read-only data: 2244k
[    1.774180] NX-protecting the kernel data: 4704k
[    1.789468] udevd[98]: starting version 173
[    1.810310] ATL1E 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[    1.810325] ATL1E 0000:02:00.0: setting latency timer to 64
[    1.813748] pata_marvell 0000:03:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    1.813783] pata_marvell 0000:03:00.0: setting latency timer to 64
[    1.816376] scsi4 : pata_marvell
[    1.817511] scsi5 : pata_marvell
[    1.817573] ata5: PATA max UDMA/100 cmd 0xec00 ctl 0xe880 bmdma 0xe400 irq 16
[    1.817575] ata6: DUMMY
[    1.980383] ata5.00: ATAPI: HL-DT-ST DVDRAM GSA-H12N, UL01, max UDMA/66
[    1.996366] ata5.00: configured for UDMA/66
[    2.005158] scsi 4:0:0:0: CD-ROM            HL-DT-ST DVDRAM GSA-H12N  UL01 PQ: 0 ANSI: 5
[    2.011204] sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray
[    2.011208] cdrom: Uniform CD-ROM driver Revision: 3.20
[    2.011398] sr 4:0:0:0: Attached scsi CD-ROM sr0
[    2.011459] sr 4:0:0:0: Attached scsi generic sg1 type 5
[    3.214082] vesafb: mode is 640x480x32, linelength=2560, pages=0
[    3.214084] vesafb: scrolling: redraw
[    3.214086] vesafb: Truecolor: size=8:8:8:8, shift=24:16:8:0
[    3.215591] vesafb: framebuffer at 0xcf000000, mapped to 0xf8500000, using 1216k, total 1216k
[    3.215726] Console: switching to colour frame buffer device 80x30
[    3.215737] fb0: VESA VGA frame buffer device
[    3.465399] Btrfs loaded
[    3.470103] xor: automatically using best checksumming function: pIII_sse
[    3.488012]    pIII_sse  : 10932.000 MB/sec
[    3.488014] xor: using function: pIII_sse (10932.000 MB/sec)
[    3.488491] device-mapper: dm-raid45: initialized v0.2594b
[    3.533675] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[    3.803586] udevd[361]: starting version 173
[    6.494986] Adding 7336956k swap on /dev/sda5.  Priority:-1 extents:1 across:7336956k SS
[    6.513785] coretemp coretemp.0: Using relative temperature scale!
[    6.513831] coretemp coretemp.0: Using relative temperature scale!
[    6.513839] coretemp coretemp.0: Using relative temperature scale!
[    6.513848] coretemp coretemp.0: Using relative temperature scale!
[    6.527925] lp: driver loaded but no devices found
[    6.549842] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
[    6.688112] Registered IR keymap rc-rc6-mce
[    6.688248] input: Media Center Ed. eHome Infrared Remote Transceiver (0471:0815) as /devices/pci0000:00/0000:00:1d.1/usb7/7-2/7-2:1.0/rc/rc0/input3
[    6.688324] rc0: Media Center Ed. eHome Infrared Remote Transceiver (0471:0815) as /devices/pci0000:00/0000:00:1d.1/usb7/7-2/7-2:1.0/rc/rc0
[    6.688392] mceusb 7-2:1.0: Registered Philips eHome Infrared Transceiver on usb7:2
[    6.688415] usbcore: registered new interface driver mceusb
[    6.694485] IR NEC protocol handler initialized
[    6.743415] nvidia: module license 'NVIDIA' taints kernel.
[    6.743420] Disabling lock debugging due to kernel taint
[    6.773633] CIFS VFS: Error connecting to socket. Aborting operation
[    7.007410] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    7.007419] nvidia 0000:01:00.0: setting latency timer to 64
[    7.007430] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=io+mem,decodes=none:owns=io+mem
[    7.007597] NVRM: loading NVIDIA UNIX x86 Kernel Module  302.17  Tue Jun 12 18:37:51 PDT 2012
[    7.009950] IR RC5(x) protocol handler initialized
[    7.016444] CIFS VFS: Error connecting to socket. Aborting operation
[    7.016459] CIFS VFS: Error connecting to socket. Aborting operation
[    7.020379] CIFS VFS: Error connecting to socket. Aborting operation
[    7.020537] IR RC6 protocol handler initialized
[    7.024274] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input4
[    7.025273] IR JVC protocol handler initialized
[    7.028189] CIFS VFS: cifs_mount failed w/return code = -101
[    7.028659] IR Sony protocol handler initialized
[    7.036096] CIFS VFS: cifs_mount failed w/return code = -101
[    7.036136] CIFS VFS: cifs_mount failed w/return code = -101
[    7.036434] CIFS VFS: cifs_mount failed w/return code = -101
[    7.036829] lirc_dev: IR Remote Control driver registered, major 251
[    7.037367] rc rc0: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor = 0
[    7.037369] IR LIRC bridge handler initialized
[    7.108486] HDA Intel 0000:01:00.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
[    7.108489] hda_intel: Disabling MSI
[    7.108522] HDA Intel 0000:01:00.1: setting latency timer to 64
[    7.286307] type=1400 audit(1343300708.804:2): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=535 comm="apparmor_parser"
[    7.286409] type=1400 audit(1343300708.804:3): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=535 comm="apparmor_parser"
[    7.286474] type=1400 audit(1343300708.804:4): apparmor="STATUS" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script" pid=535 comm="apparmor_parser"
[    7.302375] type=1400 audit(1343300708.820:5): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=555 comm="apparmor_parser"
[    7.302476] type=1400 audit(1343300708.820:6): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=555 comm="apparmor_parser"
[    7.302545] type=1400 audit(1343300708.820:7): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=555 comm="apparmor_parser"
[    7.332871] CIFS VFS: Error connecting to socket. Aborting operation
[    7.334549] CIFS VFS: Error connecting to socket. Aborting operation
[    7.335220] CIFS VFS: Error connecting to socket. Aborting operation
[    7.335876] CIFS VFS: Error connecting to socket. Aborting operation
[    7.352147] CIFS VFS: cifs_mount failed w/return code = -101
[    7.356130] CIFS VFS: cifs_mount failed w/return code = -101
[    7.356161] CIFS VFS: cifs_mount failed w/return code = -101
[    7.356177] CIFS VFS: cifs_mount failed w/return code = -101
[    7.385161] init: failsafe main process (720) killed by TERM signal
[    7.408748] type=1400 audit(1343300708.928:8): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=691 comm="apparmor_parser"
[    7.408855] type=1400 audit(1343300708.928:9): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=691 comm="apparmor_parser"
[    7.408931] type=1400 audit(1343300708.928:10): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=691 comm="apparmor_parser"
[    7.531648] ATL1E 0000:02:00.0: irq 44 for MSI/MSI-X
[    7.531774] ATL1E 0000:02:00.0: eth0: NIC Link is Up <1000 Mbps Full Duplex>
[    7.532673] type=1400 audit(1343300709.052:11): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=798 comm="apparmor_parser"
[    7.968024] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[    8.000021] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[    8.032055] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[    8.064027] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[    8.080392] input: HDA NVidia HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card0/input5
[    8.080479] input: HDA NVidia HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card0/input6
[    8.080595] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card0/input7
[    8.080645] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card0/input8
[    8.112558] init: apport pre-start process (860) terminated with status 1
[    8.115919] init: apport post-stop process (944) terminated with status 1
[    8.136632] init: alsa-restore main process (865) terminated with status 99
[    8.147760] init: xbmcbuntu-wait (lightdm) main process (906) killed by TERM signal
[    8.147986] init: xbmcbuntu-wait (ubiquity) main process (910) killed by TERM signal
[    8.675944] init: ureadahead-other main process (1017) terminated with status 2
[    8.678113] CIFS VFS: Error connecting to socket. Aborting operation
[    8.679717] CIFS VFS: Error connecting to socket. Aborting operation
[    8.680457] CIFS VFS: Error connecting to socket. Aborting operation
[    8.681534] CIFS VFS: Error connecting to socket. Aborting operation
[    8.708247] CIFS VFS: cifs_mount failed w/return code = -101
[    8.712066] CIFS VFS: cifs_mount failed w/return code = -101
[    8.724091] CIFS VFS: cifs_mount failed w/return code = -101
[    8.724094] CIFS VFS: cifs_mount failed w/return code = -101
[    9.094014] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0
[    9.739394] NVRM: Your system is not currently configured to drive a VGA console
[    9.739397] NVRM: on the primary VGA device. The NVIDIA Linux graphics driver
[    9.739400] NVRM: requires the use of a text-mode VGA console. Use of other console
[    9.739401] NVRM: drivers including, but not limited to, vesafb, may result in
[    9.739403] NVRM: corruption and stability problems, and is not supported.
[    9.872806] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[    9.880006] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=0
[    9.923124] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=1
[    9.928020] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=1
[   10.712072] HDMI: detected monitor SONY TV
[   10.712074]       at connection type HDMI
[   10.712077] HDMI: available speakers: FL/FR
[   10.712081] HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20 24
[   10.712083] HDMI: supports coding type AC-3: channels = 6, rates = 44100 48000 88200, max bitrate = 640000
[   11.477887] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=0
[   11.872413] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[   11.880007] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[   11.959225] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[   11.964016] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=0
[   12.012702] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=1
[   12.020017] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=1
[   12.622418] Bluetooth: Core ver 2.16
[   12.622439] NET: Registered protocol family 31
[   12.622441] Bluetooth: HCI device and connection manager initialized
[   12.622443] Bluetooth: HCI socket layer initialized
[   12.622444] Bluetooth: L2CAP socket layer initialized
[   12.622583] Bluetooth: SCO socket layer initialized
[   12.629979] Bluetooth: RFCOMM TTY layer initialized
[   12.629986] Bluetooth: RFCOMM socket layer initialized
[   12.629988] Bluetooth: RFCOMM ver 1.11
[   12.808020] HDMI: detected monitor SONY TV
[   12.808021]       at connection type HDMI
[   12.808024] HDMI: available speakers: FL/FR
[   12.808027] HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20 24
[   12.808030] HDMI: supports coding type AC-3: channels = 6, rates = 44100 48000 88200, max bitrate = 640000
[   17.648020] eth0: no IPv6 routers present
[   18.832716] CIFS VFS: default security mechanism requested.  The default security mechanism will be upgraded from ntlm to ntlmv2 in kernel release 3.1
[   83.315662] ACPI Warning: Incorrect checksum in table [OEMB] - 0x2A, should be 0x29 (20110413/tbutils-314)
[   83.315877] ACPI Warning: Incorrect checksum in table [OEMB] - 0x2A, should be 0x29 (20110413/tbutils-314)
[  213.528332] ACPI Warning: Incorrect checksum in table [OEMB] - 0x2A, should be 0x29 (20110413/tbutils-314)
[  213.528549] ACPI Warning: Incorrect checksum in table [OEMB] - 0x2A, should be 0x29 (20110413/tbutils-314)
[  293.659092] ACPI Warning: Incorrect checksum in table [OEMB] - 0x2A, should be 0x29 (20110413/tbutils-314)
[  293.659306] ACPI Warning: Incorrect checksum in table [OEMB] - 0x2A, should be 0x29 (20110413/tbutils-314)
[74925.864827] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.
[74926.013842] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[74926.020010] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[74926.114880] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[74926.120005] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=0
[74926.189066] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=1
[74926.196004] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=1
[74926.964021] HDMI: detected monitor SONY TV
[74926.964024]       at connection type HDMI
[74926.964027] HDMI: available speakers: FL/FR
[74926.964033] HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20 24
[74926.964038] HDMI: supports coding type AC-3: channels = 6, rates = 44100 48000 88200, max bitrate = 640000
[77532.470308] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[77532.476007] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[77532.658379] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[77532.664007] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=0
[77532.710818] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=1
[77532.716006] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=1
[77533.496016] HDMI: detected monitor SONY TV
[77533.496019]       at connection type HDMI
[77533.496023] HDMI: available speakers: FL/FR
[77533.496028] HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20 24
[77533.496033] HDMI: supports coding type AC-3: channels = 6, rates = 44100 48000 88200, max bitrate = 640000
[77557.709714] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[77557.716016] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[77557.810790] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[77557.816007] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=0
[77557.884958] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=1
[77557.892007] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=1
[77558.660013] HDMI: detected monitor SONY TV
[77558.660016]       at connection type HDMI
[77558.660020] HDMI: available speakers: FL/FR
[77558.660026] HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20 24
[77558.660030] HDMI: supports coding type AC-3: channels = 6, rates = 44100 48000 88200, max bitrate = 640000
[80154.446213] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[80154.452007] HDMI status: Pin=5 Presence_Detect=0 ELD_Valid=0
[80154.634212] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
[80154.640006] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=0
[80154.686668] HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=1
[80154.692007] HDMI status: Pin=5 Presence_Detect=1 ELD_Valid=1
[80155.464016] HDMI: detected monitor SONY TV
[80155.464019]       at connection type HDMI
[80155.464023] HDMI: available speakers: FL/FR
[80155.464029] HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 88200, bits = 16 20 24
[80155.464034] HDMI: supports coding type AC-3: channels = 6, rates = 44100 48000 88200, max bitrate = 640000