dapper freezes on laptop

I upgraded from breezy to dapper a few weeks back. Most of the upgrade was smooth except for some hiccups with moving to pcmciautils when 2.6.15-x kernel came in...

however, every once in a while, even as i am doing something on the laptop, everything freezes. keyboard events don't help, no ssh connection is possible, not even a ping. i basically would have to hard boot.

praveen@ion:/var/log $ lspci
0000:00:00.0 Host bridge: Intel Corporation 82830 830 Chipset Host Bridge (rev 02)
0000:00:01.0 PCI bridge: Intel Corporation 82830 830 Chipset AGP Bridge (rev 02)
0000:00:1d.0 USB Controller: Intel Corporation 82801CA/CAM USB (Hub #1) (rev 01)
0000:00:1d.1 USB Controller: Intel Corporation 82801CA/CAM USB (Hub #2) (rev 01)
0000:00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 41)
0000:00:1f.0 ISA bridge: Intel Corporation 82801CAM ISA Bridge (LPC) (rev 01)
0000:00:1f.1 IDE interface: Intel Corporation 82801CAM IDE U100 (rev 01)
0000:00:1f.3 SMBus: Intel Corporation 82801CA/CAM SMBus Controller (rev 01)
0000:00:1f.5 Multimedia audio controller: Intel Corporation 82801CA/CAM AC'97 Audio Controller (rev 01)
0000:01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY
0000:02:04.0 Communication controller: Conexant HSF 56k HSFi Modem (rev 01)
0000:02:05.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)
0000:02:06.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus Controller (rev 01)
0000:02:08.0 Ethernet controller: Intel Corporation 82801CAM (ICH3) PRO/100 VE (LOM) Ethernet Controller (rev 41)
praveen@ion:/var/log $ uname -a
Linux ion 2.6.15-19-386 #1 PREEMPT Mon Mar 20 16:46:02 UTC 2006 i686 GNU/Linux

praveen@ion:/var/log $ lsmod
Module Size Used by
radeon 108832 0
drm 72852 1 radeon
speedstep_ich 5260 0
speedstep_lib 4484 1 speedstep_ich
cpufreq_userspace 4696 1
cpufreq_stats 5636 0
freq_table 4740 2 speedstep_ich,cpufreq_stats
cpufreq_powersave 1920 0
cpufreq_ondemand 6428 0
cpufreq_conservative 7332 0
video 16260 0
tc1100_wmi 6916 0
sony_acpi 5516 0
pcc_acpi 11136 0
hotkey 11556 0
dev_acpi 11140 0
container 4608 0
button 6672 0
acpi_sbs 19980 0
battery 9988 1 acpi_sbs
ac 5252 1 acpi_sbs
i2c_acpi_ec 5120 1 acpi_sbs
i2c_core 21904 1 i2c_acpi_ec
ipv6 265600 10
md_mod 72532 0
dm_mod 58936 1
parport_pc 35780 1
lp 11844 0
parport 36296 2 parport_pc,lp
sbp2 24196 0
sr_mod 16932 0
scsi_mod 138984 2 sbp2,sr_mod
af_packet 22920 4
hostap_cs 64536 0
hostap 119428 1 hostap_cs
ieee80211_crypt 6272 1 hostap
orinoco_cs 17928 1
orinoco 43156 1 orinoco_cs
hermes 7808 2 orinoco_cs,orinoco
snd_intel8x0 33436 0
snd_ac97_codec 92704 1 snd_intel8x0
snd_ac97_bus 2304 1 snd_ac97_codec
snd_pcm_oss 53664 0
snd_mixer_oss 18688 1 snd_pcm_oss
pcmcia 40508 2 hostap_cs,orinoco_cs
snd_pcm 89736 3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
snd_timer 25220 1 snd_pcm
snd 55268 6 snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore 10208 1 snd
snd_page_alloc 10632 2 snd_intel8x0,snd_pcm
joydev 10048 0
tsdev 8000 0
yenta_socket 27916 3
rsrc_nonstatic 13440 1 yenta_socket
pcmcia_core 42640 3 pcmcia,yenta_socket,rsrc_nonstatic
ohci1394 35124 0
ieee1394 299832 2 sbp2,ohci1394
e100 40580 0
mii 5888 1 e100
psmouse 36100 0
serio_raw 7300 0
shpchp 45632 0
pci_hotplug 29236 1 shpchp
intel_agp 22812 1
agpgart 34888 2 drm,intel_agp
evdev 9856 2
ext3 135688 1
jbd 58772 1 ext3
ide_generic 1536 0
uhci_hcd 33680 0
usbcore 129668 2 uhci_hcd
ide_cd 33028 0
cdrom 38560 2 sr_mod,ide_cd
ide_disk 17664 3
piix 11012 1
generic 5124 0
thermal 13576 0
processor 23360 1 thermal
fan 4868 0
capability 5000 0
commoncap 7296 1 capability
vga16fb 13448 1
vgastate 10368 1 vga16fb
fbcon 42784 72
tileblit 2816 1 fbcon
font 8320 1 fbcon
bitblit 6272 1 fbcon
softcursor 2304 1 bitblit
praveen@ion:/var/log $

Let me know if i need to provide any more info.