Ubuntu 7.10 crashes randomally on a Lenovo 3000 N100 laptop

I'm running an Ubuntu 7.10 with kernel 2.6.22-14.52-generic on a Lenovo 3000 N100 laptop. I've installed it a few days ago and have worked out most of the quirks, but there is one annoying bug.

Sometime, unexpectedly the system crashes (i.e. shutdowns unsafely like pulling out the batteries) with no warning. It happened both when plugging in to power and without.

acpi -V shows my CPU temp to be usually between 48 and 58 C (but I don't know how much is it at time of crash).

I should state that this laptop runs windows xp for lots of month and had no such problem like this there.

this happened to me in the few days i'm using it something like 5 times and happens when i'm not doing anything special (browsing the web, updating the system, etc...)

I've attached my "lshw" please tell me what to check/look for since i'm clue-less with this:

my-laptop
    description: Notebook
    product: 07683BG
    vendor: LENOVO
    version: 3000 N100
    serial: L3D4139
    width: 32 bits
    capabilities: smbios-2.4 dmi-2.4
    configuration: administrator_password=disabled boot=oem-specific chassis=notebook frontpanel_password=unknown keyboard_password=unknown power-on_password=disabled uuid=103210F2-C991-11DA-8292-000FB0C9489D
  *-core
       description: Motherboard
       product: MPAD-MSAE Customer Reference Boards
       vendor: LENOVO
       physical id: 0
       version: Not Applicable
       serial: 41W1220Z1ZBUA64M6SA
     *-firmware
          description: BIOS
          vendor: LENOVO
          physical id: 0
          version: 61ET16WW (03/14/06)
          size: 100KB
          capacity: 960KB
          capabilities: isa pci pcmcia pnp apm upgrade shadowing escd cdboot acpi usb agp biosbootspecification
     *-cpu
          description: CPU
          product: Genuine Intel(R) CPU T2300 @ 1.66GHz
          vendor: Intel Corp.
          physical id: 4
          bus info: cpu@0
          version: 6.14.8
          serial: 0000-06E8-0000-0000-0000-0000
          slot: U2E1
          size: 1GHz
          capacity: 2048MHz
          width: 32 bits
          capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor vmx est tm2 xtpr cpufreq
          configuration: id=1
        *-cache:0
             description: L1 cache
             physical id: 5
             slot: L1 Cache
             size: 16KB
             capacity: 16KB
             capabilities: asynchronous internal write-back
        *-cache:1
             description: L2 cache
             physical id: 6
             slot: L2 Cache
             size: 2MB
             capabilities: burst external write-back
        *-logicalcpu:0
             description: Logical CPU
             physical id: 1.1
             width: 32 bits
             capabilities: logical
        *-logicalcpu:1
             description: Logical CPU
             physical id: 1.2
             width: 32 bits
             capabilities: logical
     *-memory
          description: System Memory
          physical id: 11
          slot: System board or motherboard
          size: 1GB
          capacity: 3GB
        *-bank:0
             description: SODIMM DDR Synchronous
             physical id: 0
             slot: M1
             size: 1GB
             width: 32 bits
        *-bank:1
             description: SODIMM DDR Synchronous [empty]
             physical id: 1
             slot: M2
     *-pci
          description: Host bridge
          product: Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub
          vendor: Intel Corporation
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 03
          width: 32 bits
          clock: 33MHz
          configuration: driver=agpgart-intel module=intel_agp
        *-display:0
             description: VGA compatible controller
             product: Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: msi pm vga bus_master cap_list
             configuration: latency=0
        *-display:1 UNCLAIMED
             description: Display controller
             product: Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2.1
             bus info: pci@0000:00:02.1
             version: 03
             width: 32 bits
             clock: 33MHz
             capabilities: pm bus_master cap_list
             configuration: latency=0
        *-multimedia
             description: Audio device
             product: 82801G (ICH7 Family) High Definition Audio Controller
             vendor: Intel Corporation
             physical id: 1b
             bus info: pci@0000:00:1b.0
             version: 02
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi pciexpress bus_master cap_list
             configuration: driver=HDA Intel latency=0 module=snd_hda_intel
        *-pci:0
             description: PCI bridge
             product: 82801G (ICH7 Family) PCI Express Port 1
             vendor: Intel Corporation
             physical id: 1c
             bus info: pci@0000:00:1c.0
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport-driver
        *-pci:1
             description: PCI bridge
             product: 82801G (ICH7 Family) PCI Express Port 2
             vendor: Intel Corporation
             physical id: 1c.1
             bus info: pci@0000:00:1c.1
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
             configuration: driver=pcieport-driver
           *-network
                description: Wireless interface
                product: PRO/Wireless 3945ABG Network Connection
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:03:00.0
                logical name: eth1
                version: 02
                serial: 00:13:02:39:91:04
                width: 32 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=ipw3945 driverversion=1.2.2mp.ubuntu1 firmware=14.2 1:0 () ip=192.168.0.32 latency=0 link=yes module=ipw3945 multicast=yes wireless=IEEE 802.11g
        *-usb:0
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #1
             vendor: Intel Corporation
             physical id: 1d
             bus info: pci@0000:00:1d.0
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0 module=uhci_hcd
        *-usb:1
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #2
             vendor: Intel Corporation
             physical id: 1d.1
             bus info: pci@0000:00:1d.1
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0 module=uhci_hcd
        *-usb:2
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #3
             vendor: Intel Corporation
             physical id: 1d.2
             bus info: pci@0000:00:1d.2
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0 module=uhci_hcd
        *-usb:3
             description: USB Controller
             product: 82801G (ICH7 Family) USB UHCI Controller #4
             vendor: Intel Corporation
             physical id: 1d.3
             bus info: pci@0000:00:1d.3
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: uhci bus_master
             configuration: driver=uhci_hcd latency=0 module=uhci_hcd
        *-usb:4
             description: USB Controller
             product: 82801G (ICH7 Family) USB2 EHCI Controller
             vendor: Intel Corporation
             physical id: 1d.7
             bus info: pci@0000:00:1d.7
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci_hcd latency=0 module=ehci_hcd
        *-pci:2
             description: PCI bridge
             product: 82801 Mobile PCI Bridge
             vendor: Intel Corporation
             physical id: 1e
             bus info: pci@0000:00:1e.0
             version: e2
             width: 32 bits
             clock: 33MHz
             capabilities: pci subtractive_decode bus_master cap_list
           *-network
                description: Ethernet interface
                product: RTL-8139/8139C/8139C+
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 1
                bus info: pci@0000:05:01.0
                logical name: eth0
                version: 10
                serial: 00:0f:b0:c9:48:9d
                size: 10MB/s
                capacity: 100MB/s
                width: 32 bits
                clock: 33MHz
                capabilities: pm bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=8139too driverversion=0.9.28 duplex=half latency=64 link=no maxlatency=64 mingnt=32 module=8139too multicast=yes port=MII speed=10MB/s
           *-pcmcia UNCLAIMED
                description: CardBus bridge
                product: CB1410 Cardbus Controller
                vendor: ENE Technology Inc
                physical id: 4
                bus info: pci@0000:05:04.0
                version: 01
                width: 32 bits
                clock: 33MHz
                capabilities: pcmcia bus_master cap_list
                configuration: latency=176 maxlatency=7 mingnt=64
           *-firewire
                description: FireWire (IEEE 1394)
                product: R5C832 IEEE 1394 Controller
                vendor: Ricoh Co Ltd
                physical id: 6
                bus info: pci@0000:05:06.0
                version: 00
                width: 32 bits
                clock: 33MHz
                capabilities: pm ohci bus_master cap_list
                configuration: driver=ohci1394 latency=64 maxlatency=4 mingnt=2 module=ohci1394
           *-system:0 UNCLAIMED
                description: Generic system peripheral
                product: R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter
                vendor: Ricoh Co Ltd
                physical id: 6.1
                bus info: pci@0000:05:06.1
                version: 19
                width: 32 bits
                clock: 33MHz
                capabilities: pm cap_list
                configuration: latency=0
           *-system:1 UNCLAIMED
                description: System peripheral
                product: R5C843 MMC Host Controller
                vendor: Ricoh Co Ltd
                physical id: 6.2
                bus info: pci@0000:05:06.2
                version: 01
                width: 32 bits
                clock: 33MHz
                capabilities: pm cap_list
                configuration: latency=0
           *-system:2 UNCLAIMED
                description: System peripheral
                product: R5C592 Memory Stick Bus Host Adapter
                vendor: Ricoh Co Ltd
                physical id: 6.3
                bus info: pci@0000:05:06.3
                version: 0a
                width: 32 bits
                clock: 33MHz
                capabilities: pm cap_list
                configuration: latency=0
           *-system:3 UNCLAIMED
                description: System peripheral
                product: xD-Picture Card Controller
                vendor: Ricoh Co Ltd
                physical id: 6.4
                bus info: pci@0000:05:06.4
                version: 05
                width: 32 bits
                clock: 33MHz
                capabilities: pm cap_list
                configuration: latency=0
        *-isa
             description: ISA bridge
             product: 82801GBM (ICH7-M) LPC Interface Bridge
             vendor: Intel Corporation
             physical id: 1f
             bus info: pci@0000:00:1f.0
             version: 02
             width: 32 bits
             clock: 33MHz
             capabilities: isa bus_master cap_list
             configuration: latency=0
        *-ide
             description: IDE interface
             product: 82801GBM/GHM (ICH7 Family) SATA IDE Controller
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             logical name: scsi0
             logical name: scsi1
             version: 02
             width: 32 bits
             clock: 66MHz
             capabilities: ide pm bus_master cap_list emulated
             configuration: driver=ata_piix latency=0 module=ata_piix
           *-disk
                description: SCSI Disk
                product: HTS541080G9SA00
                vendor: ATA
                physical id: 0
                bus info: scsi@0:0.0.0
                logical name: /dev/sda
                version: MB4I
                serial: MPBDL0XKGKTBVM
                size: 74GB
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5
              *-volume:0
                   description: HPFS/NTFS partition
                   physical id: 1
                   bus info: scsi@0:0.0.0,1
                   logical name: /dev/sda1
                   capacity: 59GB
                   capabilities: primary bootable
              *-volume:1
                   description: Compaq diagnostics partition
                   physical id: 2
                   bus info: scsi@0:0.0.0,2
                   logical name: /dev/sda2
                   capacity: 4635MB
                   capabilities: primary boot
              *-volume:2
                   description: Linux filesystem partition
                   physical id: 3
                   bus info: scsi@0:0.0.0,3
                   logical name: /dev/sda3
                   capacity: 8816MB
                   capabilities: primary
              *-volume:3
                   description: Linux swap / Solaris partition
                   physical id: 4
                   bus info: scsi@0:0.0.0,4
                   logical name: /dev/sda4
                   capacity: 1427MB
                   capabilities: primary nofs
           *-cdrom
                description: DVD-RAM writer
                product: DVDRAM GMA-4082N
                vendor: HL-DT-ST
                physical id: 1
                bus info: scsi@1:0.0.0
                logical name: /dev/cdrom
                logical name: /dev/dvd
                logical name: /dev/scd0
                logical name: /dev/sr0
                version: HA01
                capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
                configuration: ansiversion=5 status=open
        *-serial UNCLAIMED
             description: SMBus
             product: 82801G (ICH7 Family) SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 02
             width: 32 bits
             clock: 33MHz
             configuration: latency=0

or here http://pastebin.ca/raw/921253