Hi,

I have a Lenovo T61 and I had a Kernel panic today (frozen X-Server with blinking Capslock-Led). The logs did not show anything about right before the panic. 

Now after the reboot I saw this OOps and I think it might be related.

I have installed the backported modules package.
ii  linux-backports-modules-2.6.27-7-generic       2.6.27-7.6      Ubuntu supplied Linux modules for version 2.6.27 on x86/x86_64
ii  linux-backports-modules-intrepid               2.6.27.7.11           Generic Linux backported drivers.
ii  linux-backports-modules-intrepid-generic       2.6.27.7.11        Backported drivers for generic kernel image

uname -a:
Linux bart 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 i686 GNU/Linux

This is the kernel messages I observed (I hope this helps):
[   65.658860] ------------[ cut here ]------------                                                                                                                                     
[   65.658874] WARNING: at /build/buildd/linux-backports-modules-2.6.27-2.6.27/debian/build/build-generic/compat-wireless-2.6/net/mac80211/main.c:227 ieee80211_hw_config+0x8f/0xa0 [lbm_cw_mac80211]()                                                                                                                                                                         
[   65.658883] Modules linked in: binfmt_misc rfcomm bridge stp bnep sco l2cap bluetooth af_packet ppdev vmnet vmblock vmci vmmon ipv6 sbs pci_slot sbshc container acpi_cpufreq cpufreq_conservative cpufreq_userspace cpufreq_ondemand cpufreq_powersave cpufreq_stats freq_table iptable_filter ip_tables x_tables sha256_generic aes_i586 aes_generic cbc dm_crypt sbp2 parport_pc lp parport loop joydev pcmcia snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm arc4 ecb crypto_blkcipher snd_seq_dummy snd_seq_oss thinkpad_acpi serio_raw nvram iwlagn evdev pcspkr dm_multipath scsi_dh snd_seq_midi psmouse iwlcore snd_rawmidi rfkill video output battery ac snd_seq_midi_event led_class nvidia(P) snd_seq agpgart lbm_cw_mac80211 wmi snd_timer i2c_core lbm_cw_cfg80211 snd_seq_device yenta_socket sdhci_pci iTCO_wdt button rsrc_nonstatic sdhci ricoh_mmc snd pcmcia_core mmc_core iTCO_vendor_support soundcore snd_page_alloc shpchp pci_hotplug ext3 jbd mbcache sr_mod cdrom sd_mod crc_t10dif sg ata_piix pata_acpi ohci1394 ahci ata_generic ieee1394 libata scsi_mod ehci_hcd dock uhci_hcd usbcore e1000e raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear md_mod dm_mirror dm_log dm_snapshot dm_mod thermal processor fan fbcon tileblit font bitblit softcursor fuse         
[   65.659156] Pid: 7344, comm: wpa_supplicant Tainted: P          2.6.27-7-generic #1                                                                                                  
[   65.659164]  [<c037c406>] ? printk+0x1d/0x1f                                                                                                                                         
[   65.659180]  [<c0131de9>] warn_on_slowpath+0x59/0x90                                                                                                                                 
[   65.659197]  [<c037e53b>] ? _spin_lock_irq+0x1b/0x20                                                                                                                                 
[   65.659208]  [<c037cedd>] ? wait_for_common+0xcd/0x140                                                                                                                               
[   65.659218]  [<c012b6a0>] ? default_wake_function+0x0/0x10                                                                                                                           
[   65.659231]  [<f8c69d94>] ? iwl_power_update_mode+0x14/0x370 [iwlcore]                                                                                                               
[   65.659256]  [<c0144f12>] ? synchronize_rcu+0x32/0x40                                                                                                                                
[   65.659267]  [<c0144fb0>] ? wakeme_after_rcu+0x0/0x20                                                                                                                                
[   65.659277]  [<c037e62d>] ? _spin_lock+0xd/0x10                                                                                                                                      
[   65.659287]  [<f8c68fee>] ? iwl_get_channel_info+0xe/0xb0 [iwlcore]                                                                                                                  
[   65.659310]  [<f8bd5362>] ? __ieee80211_key_todo+0x212/0x2b0 [lbm_cw_mac80211]                                                                                                       
[   65.659342]  [<f8ca90ee>] ? iwl_set_rate+0xe/0xe0 [iwlagn]                                                                                                                           
[   65.659360]  [<c037d3d8>] ? mutex_unlock+0x8/0x20                                                                                                                                    
[   65.659370]  [<f8cacc07>] ? iwl_mac_config+0x57/0x2c0 [iwlagn]                                                                                                                       
[   65.659388]  [<f8bc2388>] ? __sta_info_free+0x38/0x50 [lbm_cw_mac80211]                                                                                                              
[   65.659418]  [<f8bc025f>] ieee80211_hw_config+0x8f/0xa0 [lbm_cw_mac80211]                                                                                                            
[   65.659444]  [<f8bc7f31>] ieee80211_set_disassoc+0x151/0x1a0 [lbm_cw_mac80211]                                                                                                       
[   65.659473]  [<f8bc7ff0>] ieee80211_sta_disassociate+0x70/0x80 [lbm_cw_mac80211]                                                                                                     
[   65.659502]  [<f8bc17d2>] ieee80211_ioctl_siwmlme+0x72/0x90 [lbm_cw_mac80211]                                                                                                        
[   65.659527]  [<c0369c4f>] ioctl_standard_iw_point+0xef/0x290                                                                                                                         
[   65.659538]  [<c0369ece>] ioctl_standard_call+0xde/0x110                                                                                                                             
[   65.659548]  [<f8bc1760>] ? ieee80211_ioctl_siwmlme+0x0/0x90 [lbm_cw_mac80211]
[   65.659574]  [<c02f23d5>] ? __dev_get_by_name+0x85/0xb0
[   65.659586]  [<c036971e>] wireless_process_ioctl+0xbe/0x150
[   65.659597]  [<f8bc1760>] ? ieee80211_ioctl_siwmlme+0x0/0x90 [lbm_cw_mac80211]
[   65.659623]  [<c037d430>] ? mutex_lock+0x10/0x20
[   65.659631]  [<c0369820>] wext_handle_ioctl+0x70/0xe0
[   65.659640]  [<c0369df0>] ? ioctl_standard_call+0x0/0x110
[   65.659650]  [<c03699e0>] ? ioctl_private_call+0x0/0x180
[   65.659660]  [<c02f452f>] dev_ioctl+0x45f/0x520
[   65.659668]  [<c0213664>] ? security_file_permission+0x14/0x20
[   65.659680]  [<c02e4b50>] ? sock_ioctl+0x0/0x250
[   65.659691]  [<c02e4c45>] sock_ioctl+0xf5/0x250
[   65.659700]  [<c02e4b50>] ? sock_ioctl+0x0/0x250
[   65.659710]  [<c01bee9d>] vfs_ioctl+0x2d/0x90
[   65.659718]  [<c01bf086>] do_vfs_ioctl+0x66/0x1f0
[   65.659726]  [<c01b1d20>] ? do_sync_write+0x0/0x120
[   65.659737]  [<c02147d8>] ? cap_file_ioctl+0x8/0x10
[   65.659748]  [<c01bf27b>] sys_ioctl+0x6b/0x70
[   65.659756]  [<c0103f7b>] sysenter_do_call+0x12/0x2f
[   65.659766]  =======================
[   65.659771] ---[ end trace 15cfd36ed63708e9 ]---