[solved?] possible reasons for random shutdowns

Several months ago, my laptop started to suddenly shutdown for no apparent reason. Initially, I assumed it was overheating. Lenovo had a look, found nothing but replaced the thermal paste anyway, gave it back.
The issue continued so somebody from IT stuck my laptop in a server room on top of a hot computer and stress tested it for a few hours. Conclusion: can find nothing wrong, definitely not a heat problem! (Laptop never went above 65.) They ran a bunch of hardware tests as part of this, got my cable and adaptor tested etc.
Next theory: issue had only ever occurred on one level of the building (in my office) and it turned out there had been another issue with another laptop in that area and it turned out to be shutting down to protect itself due to spikes in the power supply. A UPS solved that issue. One is currently on order for me.
Meanwhile, last weekend I had the issue occur twice in a friend's house in Birmingham. Even more worrying, however, I just had it happen here at home even though I use the machine extensively here and have never seen this happen here before.
I'm guessing this rules out the environmental hypothesis although I'm by no means certain of this.
That leaves: hardware or software.
Hardware is a pain - Lenovo already ran it for 48 hours straight and found nothing. Moreover, although I have paid to extend the warranty and although they've taken my money, I've so far been entirely unsuccessful in getting Lenovo's system to recognise the extension. In any case, with the holidays and everything I'd rather be sure of what I'm dealing with before giving the machine up for an extended period of time. I cannot reliably reproduce the issue so it is hard to troubleshoot.
So I would like to know what possible software issues might trigger apparently random shutdowns.
The shutdowns are immediate. One minute I am working on some document or whatever. The next the machine is off. journalctl shows nothing except:
-- Reboot --
If it was a hardware protection feature, would this get logged?
It does not reboot - it powers off - but I always have issues with reboot since I switched to systemd. Generally, it just powers off instead. [Oh, and before anybody tries to blame systemd, the random shutdowns started before I switched to systemd.]
I've checked the RAM.
Any suggestions, however unlikely, are welcome at this point.
Last edited by cfr (2013-04-13 23:42:03)

Thanks. The adaptor, cable etc. was "PAT tested" by the electricals person in our building and they checked the fuse etc. in the plug as well. Moreover, the laptop never usually has a problem switching from AC to battery and back. My battery is more than adequate for this sort of purpose and, if the battery did run low, the laptop would automatically suspend to RAM. Also, I know if this happens because, among other things, the display is set to dim on switch to battery. When the power supply has disappeared due to a power cut or just unplugging it, the switch has always been flawless.
I've just been jiggling and shaking and rotating the laptop itself as suggested above with no effect whatsoever. I've also tried pressing around the edges of the casing just in case I'm somehow putting pressure somewhere and that's affecting things. (I assume if it was pressure due to typing or touchpad, it would be happening all the time.)
I've also just spent a while jiggling the adaptor and both parts of the cable - also with no effect.
The one thing which makes me reluctant to test sans battery is that I've read that the batteries in ThinkPads serve some sort of protective function in case of issues with the power supply and that you shouldn't use them without the battery for that reason. (Somewhere on Lenovo's site but it was months ago so I can't remember where to check the details.) In case there is an issue with the power, I'd obviously rather not fry the laptop. (But it seems weird if it happens in several places in that case...)
I'm not sure about the cold boot comment. Do you think a cold boot might help? If so, I already performed one yesterday as I opened the back to look for loose connections. So if a cold boot might help, I'll just have to see. I've done cold boots before, though, after opening it up to look for issues following shutdowns.
These issues appeared several months ago and I've reproduced the issue with the LTS kernel a while back. So if it is a regression, it has been around for a bit. I might try a live Ubuntu USB. (I don't have an optical drive.) The problem is that a negative result won't really prove anything because the issue is so random. Given that yesterday is the first time it has ever happened to me at home and that even in my office I've sometimes gone three or four days without problem, a couple of days testing won't cut it. (And will make it difficult for me to get stuff done!) It might be best to wait and try it in my office after the holidays - if it worked for, say, a week there without issue, that would strongly suggest something in my Arch setup. (Or something about the hdd, I guess.)
Somebody suggested modules so, for the record, here's output from lsmod:
Module Size Used by
usb_storage 47385 0
uas 11120 0
efivars 12441 1
fuse 69213 3
hid_generic 1114 0
usbhid 37036 0
hid 85974 2 hid_generic,usbhid
rfcomm 33792 8
bnep 8858 2
ipt_REJECT 2282 2
ip6t_REJECT 2797 2
xt_LOG 12055 6
xt_limit 1978 6
xt_tcpudp 2472 4
nf_conntrack_ipv4 7799 5
nf_defrag_ipv4 1340 1 nf_conntrack_ipv4
nf_conntrack_ipv6 7512 5
nf_defrag_ipv6 6318 1 nf_conntrack_ipv6
xt_recent 8603 12
xt_conntrack 3298 10
nf_conntrack 64101 3 xt_conntrack,nf_conntrack_ipv4,nf_conntrack_ipv6
iptable_filter 1457 1
ip_tables 16947 1 iptable_filter
ip6table_filter 1397 1
ip6_tables 18519 1 ip6table_filter
x_tables 17000 11 ip6table_filter,xt_recent,ip_tables,xt_tcpudp,xt_limit,xt_conntrack,xt_LOG,iptable_filter,ipt_REJECT,ip6_tables,ip6t_REJECT
nls_cp437 5954 1
vfat 10120 1
fat 48403 1 vfat
uvcvideo 72788 0
videobuf2_vmalloc 2469 1 uvcvideo
videobuf2_memops 2283 1 videobuf2_vmalloc
coretemp 6071 0
kvm_intel 124718 0
snd_hda_codec_hdmi 24529 1
videobuf2_core 24073 1 uvcvideo
videodev 100860 2 uvcvideo,videobuf2_core
snd_hda_codec_conexant 47159 1
btusb 12373 0
kvm 374014 1 kvm_intel
media 10406 2 uvcvideo,videodev
joydev 9992 0
arc4 2040 2
bluetooth 192234 22 bnep,btusb,rfcomm
iwldvm 171052 0
mac80211 426350 1 iwldvm
snd_hda_intel 26181 2
snd_hda_codec 98034 3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
thinkpad_acpi 62562 0
snd_hwdep 6429 1 snd_hda_codec
snd_pcm 75735 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc 7218 2 snd_pcm,snd_hda_intel
microcode 12346 0
snd_timer 18935 1 snd_pcm
nvram 5907 1 thinkpad_acpi
snd 60189 12 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_hda_codec,snd_hda_intel,thinkpad_acpi
rts_pstor 401665 0
atl1c 33647 0
psmouse 71952 0
iwlwifi 125182 1 iwldvm
iTCO_wdt 5256 0
iTCO_vendor_support 1930 1 iTCO_wdt
cfg80211 177109 3 iwlwifi,mac80211,iwldvm
rfkill 15605 5 cfg80211,thinkpad_acpi,bluetooth
soundcore 5443 1 snd
i2c_i801 9572 0
evdev 10267 25
serio_raw 4690 0
pcspkr 1900 0
mei 32666 0
lpc_ich 10610 0
ac 2537 0
thermal 8120 0
battery 6774 0
wmi 8380 0
nfs 127008 0
lockd 64905 1 nfs
sunrpc 186134 2 nfs,lockd
fscache 40996 1 nfs
acpi_cpufreq 5934 0
mperf 1300 1 acpi_cpufreq
processor 26856 1 acpi_cpufreq
ext4 440435 10
crc16 1360 2 ext4,bluetooth
jbd2 78802 1 ext4
mbcache 6027 1 ext4
sha256_generic 10262 2
ablk_helper 1973 0
aes_x86_64 7556 5
aes_generic 26139 1 aes_x86_64
cbc 2737 1
dm_crypt 15800 1
dm_mod 72106 35 dm_crypt
sd_mod 29560 4
crc32c_intel 1988 0
ghash_clmulni_intel 4278 0
cryptd 8742 2 ghash_clmulni_intel,ablk_helper
ahci 21361 3
libahci 20024 1 ahci
libata 167757 2 ahci,libahci
scsi_mod 133434 5 uas,usb_storage,libata,rts_pstor,sd_mod
ehci_hcd 41817 0
usbcore 150472 6 uas,btusb,uvcvideo,usb_storage,ehci_hcd,usbhid
usb_common 955 1 usbcore
i915 496012 3
video 11277 1 i915
button 4663 1 i915
i2c_algo_bit 5392 1 i915
intel_agp 10745 1 i915
intel_gtt 15660 2 i915,intel_agp
drm_kms_helper 32878 1 i915
drm 218903 4 i915,drm_kms_helper
i2c_core 20708 6 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit,videodev
I did wonder about the watchdogs and whether I should try turning (any of?) them off. But I suspect this thought just shows my ignorance of these things.
I don't think there's a fan in my power supply - it is just a brick type adaptor between the AC and the laptop. If it is the battery, it would be odd that it only ever happens when I'm plugged into AC. (Again, I use it a lot more on AC and the problem is random so this need not mean much.) One difference between battery and AC is that laptop-mode tools is configured to disable the NMI watchdog on battery. But again, I don't understand enough of what this means to know whether this is even vaguely relevant.
My graphics is intel so I'm not using any closed source drivers from Nvidia or ATI. The driver is currently set to use the default acceleration. QT is using default rendering (X11/XRender) rather than Raster or the experimental OpenGL.

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Right guy's i to have researched this problem
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mdimport"as of Joeaux but this was not my problem.In
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