I have the consumer D600 the 600M and this issue has just started
appearing for me to.  It appears to be similar to bug #37773 in symptons
and it appears to be correlated with wifi usage.

Here is my log of the first lockup after a fresh startup:

Sep  1 12:05:03 localhost kernel: [17179746.856000] BUG: soft lockup detected 
on CPU#0!
Sep  1 12:05:03 localhost kernel: [17179746.856000] 
Sep  1 12:05:03 localhost kernel: [17179746.856000] Pid: 0, comm:              
swapper
Sep  1 12:05:03 localhost kernel: [17179746.856000] EIP: 
0060:[delay_pmtmr+20/32] CPU: 0
Sep  1 12:05:03 localhost kernel: [17179746.856000] EIP is at 
delay_pmtmr+0x14/0x20
Sep  1 12:05:03 localhost kernel: [17179746.856000]  EFLAGS: 00000287    
Tainted: P       (2.6.15-26-386)
Sep  1 12:05:03 localhost kernel: [17179746.856000] EAX: 198d14a1 EBX: 00001733 
ECX: 198d0b4a EDX: 0000002e
Sep  1 12:05:03 localhost kernel: [17179746.856000] ESI: f6171260 EDI: c0387f04 
EBP: c0387ef8 DS: 007b ES: 007b
Sep  1 12:05:03 localhost kernel: [17179746.856000] CR0: 8005003b CR2: 00591000 
CR3: 35d59000 CR4: 00000690
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [pg0+945526589/1069368320] 
tg3_readphy+0x5d/0xf0 [tg3]
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [pg0+945533188/1069368320] 
tg3_setup_copper_phy+0x184/0x820 [tg3]
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [pg0+945558368/1069368320] 
tg3_timer+0x0/0x2e0 [tg3]
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [pg0+945539751/1069368320] 
tg3_setup_phy+0x87/0xe0 [tg3]
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [pg0+945558795/1069368320] 
tg3_timer+0x1ab/0x2e0 [tg3]
Sep  1 12:05:03 localhost kernel: [17179746.856000]  
[run_timer_softirq+182/464] run_timer_softirq+0xb6/0x1d0
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [__do_softirq+79/176] 
__do_softirq+0x4f/0xb0
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [do_softirq+53/64] 
do_softirq+0x35/0x40
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [irq_exit+53/64] 
irq_exit+0x35/0x40
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [do_IRQ+31/48] 
do_IRQ+0x1f/0x30
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [common_interrupt+26/32] 
common_interrupt+0x1a/0x20
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [pg0+944012146/1069368320] 
acpi_processor_idle+0x155/0x2bc [processor]
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [cpu_idle+28/96] 
cpu_idle+0x1c/0x60
Sep  1 12:05:03 localhost kernel: [17179746.856000]  [start_kernel+374/464] 
start_kernel+0x176/0x1d0
Sep  1 12:05:03 localhost kernel: [17179748.232000] ipw2200: Firmware error 
detected.  Restarting.
Sep  1 12:05:15 localhost kernel: [17179758.236000] BUG: soft lockup detected 
on CPU#0!
Sep  1 12:05:15 localhost kernel: [17179758.236000] 
Sep  1 12:05:15 localhost kernel: [17179758.236000] Pid: 0, comm:              
swapper
Sep  1 12:05:15 localhost kernel: [17179758.236000] EIP: 
0060:[delay_pmtmr+20/32] CPU: 0
Sep  1 12:05:15 localhost kernel: [17179758.236000] EIP is at 
delay_pmtmr+0x14/0x20
Sep  1 12:05:15 localhost kernel: [17179758.236000]  EFLAGS: 00000297    
Tainted: P       (2.6.15-26-386)
Sep  1 12:05:15 localhost kernel: [17179758.236000] EAX: f7a7c161 EBX: 00003ddc 
ECX: f7a79006 EDX: 00000031
Sep  1 12:05:15 localhost kernel: [17179758.236000] ESI: f6171260 EDI: c0387f04 
EBP: c0387ef8 DS: 007b ES: 007b
Sep  1 12:05:15 localhost kernel: [17179758.236000] CR0: 8005003b CR2: b7f34000 
CR3: 34b8b000 CR4: 00000690
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [pg0+945526589/1069368320] 
tg3_readphy+0x5d/0xf0 [tg3]
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [pg0+945533179/1069368320] 
tg3_setup_copper_phy+0x17b/0x820 [tg3]
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [pg0+945558368/1069368320] 
tg3_timer+0x0/0x2e0 [tg3]
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [pg0+945539751/1069368320] 
tg3_setup_phy+0x87/0xe0 [tg3]
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [pg0+945558795/1069368320] 
tg3_timer+0x1ab/0x2e0 [tg3]
Sep  1 12:05:15 localhost kernel: [17179758.236000]  
[run_timer_softirq+182/464] run_timer_softirq+0xb6/0x1d0
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [__do_softirq+79/176] 
__do_softirq+0x4f/0xb0
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [do_softirq+53/64] 
do_softirq+0x35/0x40
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [irq_exit+53/64] 
irq_exit+0x35/0x40
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [do_IRQ+31/48] 
do_IRQ+0x1f/0x30
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [common_interrupt+26/32] 
common_interrupt+0x1a/0x20
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [pg0+944012146/1069368320] 
acpi_processor_idle+0x155/0x2bc [processor]
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [cpu_idle+28/96] 
cpu_idle+0x1c/0x60
Sep  1 12:05:15 localhost kernel: [17179758.236000]  [start_kernel+374/464] 
start_kernel+0x176/0x1d0
Sep  1 12:05:15 localhost kernel: [17179760.396000] ipw2200: Firmware error 
detected.  Restarting.
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
7 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Cancelling scan request 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: clearing own WPA/RSN IE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Automatic auth_alg selection: 0x1 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: clearing AP WPA IE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: clearing AP RSN IE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: clearing own WPA/RSN IE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
No keys have been configured - skip key clearing 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
wpa_driver_wext_set_drop_unencrypted 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: SCANNING -> ASSOCIATING 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
wpa_driver_wext_associate 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Setting authentication timeout: 10 sec 0 usec 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portControl=ForceAuthorized 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b06 len=8 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b1a len=12 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b15 len=20 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: new AP: 00:00:00:00:00:00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Added BSSID 00:00:00:00:00:00 into blacklist 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: ASSOCIATING -> DISCONNECTED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portEnabled=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portValid=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
NK, IFLA_IFNAME: Interface 'eth1' added 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b15 len=20 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: new AP: 00:00:00:00:00:00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
BSSID 00:00:00:00:00:00 blacklist count incremented to 2 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: DISCONNECTED -> DISCONNECTED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portEnabled=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portValid=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b15 len=20 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: new AP: 00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: DISCONNECTED -> ASSOCIATED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Associated to a new BSS: BSSID=00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Associated with 00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: Association event - clear replay counter 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portEnabled=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portValid=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
L: External notification - portEnabled=1 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_PAE entering state S_FORCE_AUTH 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_BE entering state IDLE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Cancelling authentication timeout 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: ASSOCIATED -> COMPLETED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL-EVENT-CONNECTED - Connection to 00:12:44:b1:e8:b0 completed (auth) 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
RTM_NEWLINK, IFLA_IFNAME: Interface 'eth1' added 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
RTM_NEWLINK, IFLA_IFNAME: Interface 'eth1' added 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b15 len=20 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: new AP: 00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: COMPLETED -> ASSOCIATED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Associated with 00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: Association event - clear replay counter 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portEnabled=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_PAE entering state DISCONNECTED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_BE entering state INITIALIZE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
al notification - portValid=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portEnabled=1 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_PAE entering state S_FORCE_AUTH 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_BE entering state IDLE 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Cancelling authentication timeout 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: ASSOCIATED -> COMPLETED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL-EVENT-CONNECTED - Connection to 00:12:44:b1:e8:b0 completed (reauth) 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
RTM_NEWLINK, IFLA_IFNAME: Interface 'eth1' added 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: cmd=0x8b15 len=20 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Wireless event: new AP: 00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
State: COMPLETED -> ASSOCIATED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
Associated with 00:12:44:b1:e8:b0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
CTRL_IFACE monitor send - hexdump(len=42): 2f 76 61 72 2f 72 75 6e 2f 4e 65 74 
77 6f 72 6b 4d 61 6e 61 67 65 72 2f 77 70 61 5f 63 74 72 6c 5f 34 34 39 34 2d 
31 00 00 00 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
WPA: Association event - clear replay counter 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: External notification - portEnabled=0 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_PAE entering state DISCONNECTED 
Sep  1 12:05:16 localhost NetworkManager: <information>^Iwpa_supplicant(4938): 
EAPOL: SUPP_BE entering state INITIALIZE 
Sep  1 12:05:28 localhost kernel: [17179770.400000] BUG: soft lockup detected 
on CPU#0!

-- 
recent dapper kernels causing lockups on Dell Latitude D600
https://launchpad.net/bugs/53578

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