I'm too little of a linux hacker to be able to diagnose your problem. But here
is first the short lshw (thank you for hinting about this copact printout).
I also include a lsmod to show which drivers are running.
dag@tp:~$ sudo lshw -short
H/W path Device Class Description
============================================================
system 4174P4G ()
/0 bus 4174P4G
/0/1 processor Intel(R) Core(TM) i7-2620M CPU
@ 2.70GHz
/0/1/2 memory 64KiB L1 cache
/0/1/3 memory 256KiB L2 cache
/0/1/4 memory 4MiB L3 cache
/0/5 memory 8GiB System Memory
/0/5/0 memory 4GiB SODIMM DDR3 Synchronous
1333 MHz (0.8 ns)
/0/5/1 memory 4GiB SODIMM DDR3 Synchronous
1333 MHz (0.8 ns)
/0/f memory 128KiB BIOS
/0/100 bridge 2nd Generation Core Processor
Family DRAM Controller
/0/100/2 display 2nd Generation Core Processor
Family Integrated Graphics Controller
/0/100/16 communication 6 Series/C200 Series Chipset
Family MEI Controller #1
/0/100/16.3 communication 6 Series/C200 Series Chipset
Family KT Controller
/0/100/19 eth0 network 82579LM Gigabit Network
Connection
/0/100/1a bus 6 Series/C200 Series Chipset
Family USB Enhanced Host Controller #2
/0/100/1b multimedia 6 Series/C200 Series Chipset
Family High Definition Audio Controller
/0/100/1c bridge 6 Series/C200 Series Chipset
Family PCI Express Root Port 1
/0/100/1c.1 bridge 6 Series/C200 Series Chipset
Family PCI Express Root Port 2
/0/100/1c.1/0 wlan0 network Centrino Ultimate-N 6300
/0/100/1c.3 bridge 6 Series/C200 Series Chipset
Family PCI Express Root Port 4
/0/100/1c.3/0 generic Ricoh Co Ltd
/0/100/1c.4 bridge 6 Series/C200 Series Chipset
Family PCI Express Root Port 5
/0/100/1c.4/0 bus uPD720200 USB 3.0 Host
Controller
/0/100/1d bus 6 Series/C200 Series Chipset
Family USB Enhanced Host Controller #1
/0/100/1f bridge QM67 Express Chipset Family
LPC Controller
/0/100/1f.2 scsi0 storage 6 Series/C200 Series Chipset
Family 6 port SATA AHCI Controller
/0/100/1f.2/0.0.0 /dev/sda disk 160GB INTEL SSDSA2BW16
/0/100/1f.2/0.0.0/1 /dev/sda1 volume 131GiB EXT4 volume
/0/100/1f.2/0.0.0/2 /dev/sda2 volume 17GiB Extended partition
/0/100/1f.2/0.0.0/2/5 /dev/sda5 volume 8276MiB Linux swap / Solaris
partition
/0/100/1f.2/0.0.0/2/6 /dev/sda6 volume 9537MiB Linux filesystem
partition
/0/100/1f.3 bus 6 Series/C200 Series Chipset
Family SMBus Controller
/1 power 42T4845
/2 power 51J0508
/3 usb0 network Ethernet interface
dag@tp:~$ sudo lsmod | sort
ahci 26002 3
arc4 12529 2
binfmt_misc 17540 1
bluetooth 166112 23 bnep,rfcomm,btusb
bnep 18436 2
btusb 18600 2
cdc_acm 22761 0
cdc_ncm 17399 0
cdc_wdm 17545 0
cfg80211 199587 2 iwlagn,mac80211
coretemp 13420 0
drm 236330 4 i915,drm_kms_helper
drm_kms_helper 42558 1 i915
e1000e 160582 0
hid 95463 1 usbhid
i2c_algo_bit 13423 1 i915
i915 566711 3
iptable_filter 12810 1
ip_tables 27473 1 iptable_filter
iwlagn 314213 0
joydev 17693 0
libahci 26861 1 ahci
lp 17799 0
mac80211 462092 1 iwlagn
mei 41480 0
Module Size Used by
nvram 14413 1 thinkpad_acpi
parport 46562 3 parport_pc,ppdev,lp
parport_pc 36962 0
pci_stub 12622 1
ppdev 17113 0
psmouse 73882 0
rfcomm 47946 8
sdhci 32166 1 sdhci_pci
sdhci_pci 14032 0
serio_raw 13166 0
snd 68266 14
snd_hda_codec_conexant,thinkpad_acpi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
snd_hda_codec 104802 2 snd_hda_codec_conexant,snd_hda_intel
snd_hda_codec_conexant 62197 1
snd_hda_intel 33390 2
snd_hwdep 13668 1 snd_hda_codec
snd_page_alloc 18529 2 snd_hda_intel,snd_pcm
snd_pcm 96755 2 snd_hda_intel,snd_hda_codec
snd_rawmidi 30547 1 snd_seq_midi
snd_seq 61896 2 snd_seq_midi,snd_seq_midi_event
snd_seq_device 14540 3 snd_seq_midi,snd_rawmidi,snd_seq
snd_seq_midi 13324 0
snd_seq_midi_event 14899 1 snd_seq_midi
snd_timer 29991 2 snd_pcm,snd_seq
soundcore 12680 1 snd
thinkpad_acpi 81819 0
thinkpad_ec 14449 1 tp_smapi
tifm_core 15654 1 tifm_sd
tifm_sd 17883 0
tpm_tis 18546 0
tp_smapi 28400 0
usbhid 47198 0
usbnet 26212 1 cdc_ncm
uvcvideo 72711 0
v4l2_compat_ioctl32 17083 1 videodev
vboxdrv 282739 3 vboxpci,vboxnetadp,vboxnetflt
vboxnetadp 13382 0
vboxnetflt 23441 0
vboxpci 23200 0
video 19412 1 i915
videodev 93004 1 uvcvideo
wmi 19256 0
xhci_hcd 82772 0
x_tables 29846 3 xt_tcpudp,iptable_filter,ip_tables
xt_tcpudp 12603 0
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https://bugs.launchpad.net/bugs/792849
Title:
Lenovo ThinkPad T420 random hardlocks with Sandy Bridge graphics
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