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Groups > linux.debian.user > #180960 > unrolled thread

Re: Laptop randomly reboots

Started bySam Smith <debian@net153.net>
First post2017-05-12 22:40 +0200
Last post2017-09-05 21:50 +0200
Articles 7 — 3 participants

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Contents

  Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-05-12 22:40 +0200
    Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-06-13 21:30 +0200
      Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-08-28 22:50 +0200
        Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-09-05 06:50 +0200
          Re: Laptop randomly reboots rhkramer@gmail.com - 2017-09-05 13:30 +0200
            Re: Laptop randomly reboots Fungi4All <fungilife@protonmail.com> - 2017-09-05 21:50 +0200
            Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2017-09-05 21:50 +0200

#180960 — Re: Laptop randomly reboots

FromSam Smith <debian@net153.net>
Date2017-05-12 22:40 +0200
SubjectRe: Laptop randomly reboots
Message-ID<tGpvY-1zo-7@gated-at.bofh.it>
On 01/20/2017 08:04 PM, Sam Smith wrote:
> I'll try to keep this short. I bought a used Lenovo T520 back in May. It
> had the motherboard with nvidia GPU. Because it sucks power and doesn't
> really have good suspend/resume support, I bought a used mother board
> off of ebay that only had intel integrated graphics and I swapped it
> out. All was well and I had installed in it 8gb +4gb of ram.
>
> It ran like that for about 8 weeks before I bought an 8gb stick and
> stuck that in, so then I had 8gb + 8gb of ram. After about 6 weeks of
> running like, it randomly rebooted overnight. I shrugged it off and
> thought maybe the power went out or something (even though it had a
> battery in it). But then about 2 weeks later it did it again..and then
> two weeks after that. So I pulled out the new 8gb stick I had put in and
> let it run with just one 8gb stick. It ran like that for about 10 weeks
> without a problem. I put the old 4gb stick in just for fun, bringing it
> back to the original 8gb + 4gb configuration. But about 2 weeks later it
> rebooted again. At that point I bought a matched 16gb kit (8gb + 8gb)
> from new egg that seemed to come recommended from google searching for
> compatible ram for this model. But just a couple of days ago (about 3
> weeks after installing it), it rebooted by itself.
>
> I am kind of at a loss here now. I can buy another motherboard and swap
> it out again, but that takes a few hours and I don't feel like doing it.
> The cooling and thermal stuff is all good on the laptop,I've ran prime95
> and video encoding for hours and it is fine (temps stay below 80* at
> least, normal usage is 40-55*). I've also ran memtest for a few hours.
>
> What I find weird is that the machine suddenly reboots. At least a few
> years ago, ram issues would just lead to a kernel panic screen. But with
> this, the machine is just like someone pulled the plug and rebooted it.
> I started to wonder if there is some built in watchdog somewhere that
> will reboot the machine if it hangs, but I can't tell? Other than that,
> if this is the kernel that is rebooting the machine, is there any way I
> can get it to dump some info somewhere before it fully reboots? Before I
> go through the pain of swapping the board again, I'd just like to really
> know that this is a hardware issue and not the kernel detecting
> something and just choosing to reboot...
>
> Thanks for any info,
>
> Sam
>

Just an update. My uptime is now 80 days and I haven't had any random 
reboots. The only thing I did was pull in the latest apt-get updates 
(which took me from Jessie 6.6 to 6.7 I think, but also installed a 
newer xorg-intel driver from backports). I also read somewhere that 
there were some "issues" with having the hardware virtualization 
extensions enabled in BIOS (can't remember what the issues were) so I 
disabled those after running the apt-get upgrade and rebooting.

Never gone this long without a reboot so I guess perhaps I'm good. But 
if this was indeed a software caused reboot, I'd like to know what 
setting I need to change so that debian would just hang at a kernel 
panic screen (or something similar) instead of just an instant dump and 
reboot leaving me thinking that it is hardware issues (which it may 
still be....)


Regards,
Samuel Smith

[toc] | [next] | [standalone]


#182164

FromSam Smith <debian@net153.net>
Date2017-06-13 21:30 +0200
Message-ID<tRZFM-3wK-19@gated-at.bofh.it>
In reply to#180960
On 05/12/2017 03:38 PM, Sam Smith wrote:
> On 01/20/2017 08:04 PM, Sam Smith wrote:
>> I'll try to keep this short. I bought a used Lenovo T520 back in May. It
>> had the motherboard with nvidia GPU. Because it sucks power and doesn't
>> really have good suspend/resume support, I bought a used mother board
>> off of ebay that only had intel integrated graphics and I swapped it
>> out. All was well and I had installed in it 8gb +4gb of ram.
>>
>> It ran like that for about 8 weeks before I bought an 8gb stick and
>> stuck that in, so then I had 8gb + 8gb of ram. After about 6 weeks of
>> running like, it randomly rebooted overnight. I shrugged it off and
>> thought maybe the power went out or something (even though it had a
>> battery in it). But then about 2 weeks later it did it again..and then
>> two weeks after that. So I pulled out the new 8gb stick I had put in and
>> let it run with just one 8gb stick. It ran like that for about 10 weeks
>> without a problem. I put the old 4gb stick in just for fun, bringing it
>> back to the original 8gb + 4gb configuration. But about 2 weeks later it
>> rebooted again. At that point I bought a matched 16gb kit (8gb + 8gb)
>> from new egg that seemed to come recommended from google searching for
>> compatible ram for this model. But just a couple of days ago (about 3
>> weeks after installing it), it rebooted by itself.
>>
>> I am kind of at a loss here now. I can buy another motherboard and swap
>> it out again, but that takes a few hours and I don't feel like doing it.
>> The cooling and thermal stuff is all good on the laptop,I've ran prime95
>> and video encoding for hours and it is fine (temps stay below 80* at
>> least, normal usage is 40-55*). I've also ran memtest for a few hours.
>>
>> What I find weird is that the machine suddenly reboots. At least a few
>> years ago, ram issues would just lead to a kernel panic screen. But with
>> this, the machine is just like someone pulled the plug and rebooted it.
>> I started to wonder if there is some built in watchdog somewhere that
>> will reboot the machine if it hangs, but I can't tell? Other than that,
>> if this is the kernel that is rebooting the machine, is there any way I
>> can get it to dump some info somewhere before it fully reboots? Before I
>> go through the pain of swapping the board again, I'd just like to really
>> know that this is a hardware issue and not the kernel detecting
>> something and just choosing to reboot...
>>
>> Thanks for any info,
>>
>> Sam
>>
>
> Just an update. My uptime is now 80 days and I haven't had any random
> reboots. The only thing I did was pull in the latest apt-get updates
> (which took me from Jessie 6.6 to 6.7 I think, but also installed a
> newer xorg-intel driver from backports). I also read somewhere that
> there were some "issues" with having the hardware virtualization
> extensions enabled in BIOS (can't remember what the issues were) so I
> disabled those after running the apt-get upgrade and rebooting.
>
> Never gone this long without a reboot so I guess perhaps I'm good. But
> if this was indeed a software caused reboot, I'd like to know what
> setting I need to change so that debian would just hang at a kernel
> panic screen (or something similar) instead of just an instant dump and
> reboot leaving me thinking that it is hardware issues (which it may
> still be....)
>
>
> Regards,
> Samuel Smith
>


Guess I spoke too soon. About 10 days after I posted the above, the 
laptop randomly rebooted. :sigh:

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#186093

FromSam Smith <debian@net153.net>
Date2017-08-28 22:50 +0200
Message-ID<ujz8S-1KT-13@gated-at.bofh.it>
In reply to#182164
On 06/13/2017 02:27 PM, Sam Smith wrote:
> On 05/12/2017 03:38 PM, Sam Smith wrote:
>> On 01/20/2017 08:04 PM, Sam Smith wrote:
>>> I'll try to keep this short. I bought a used Lenovo T520 back in May. It
>>> had the motherboard with nvidia GPU. Because it sucks power and doesn't
>>> really have good suspend/resume support, I bought a used mother board
>>> off of ebay that only had intel integrated graphics and I swapped it
>>> out. All was well and I had installed in it 8gb +4gb of ram.
>>>
>>> It ran like that for about 8 weeks before I bought an 8gb stick and
>>> stuck that in, so then I had 8gb + 8gb of ram. After about 6 weeks of
>>> running like, it randomly rebooted overnight. I shrugged it off and
>>> thought maybe the power went out or something (even though it had a
>>> battery in it). But then about 2 weeks later it did it again..and then
>>> two weeks after that. So I pulled out the new 8gb stick I had put in and
>>> let it run with just one 8gb stick. It ran like that for about 10 weeks
>>> without a problem. I put the old 4gb stick in just for fun, bringing it
>>> back to the original 8gb + 4gb configuration. But about 2 weeks later it
>>> rebooted again. At that point I bought a matched 16gb kit (8gb + 8gb)
>>> from new egg that seemed to come recommended from google searching for
>>> compatible ram for this model. But just a couple of days ago (about 3
>>> weeks after installing it), it rebooted by itself.
>>>
>>> I am kind of at a loss here now. I can buy another motherboard and swap
>>> it out again, but that takes a few hours and I don't feel like doing it.
>>> The cooling and thermal stuff is all good on the laptop,I've ran prime95
>>> and video encoding for hours and it is fine (temps stay below 80* at
>>> least, normal usage is 40-55*). I've also ran memtest for a few hours.
>>>
>>> What I find weird is that the machine suddenly reboots. At least a few
>>> years ago, ram issues would just lead to a kernel panic screen. But with
>>> this, the machine is just like someone pulled the plug and rebooted it.
>>> I started to wonder if there is some built in watchdog somewhere that
>>> will reboot the machine if it hangs, but I can't tell? Other than that,
>>> if this is the kernel that is rebooting the machine, is there any way I
>>> can get it to dump some info somewhere before it fully reboots? Before I
>>> go through the pain of swapping the board again, I'd just like to really
>>> know that this is a hardware issue and not the kernel detecting
>>> something and just choosing to reboot...
>>>
>>> Thanks for any info,
>>>
>>> Sam
>>>
>>
>> Just an update. My uptime is now 80 days and I haven't had any random
>> reboots. The only thing I did was pull in the latest apt-get updates
>> (which took me from Jessie 6.6 to 6.7 I think, but also installed a
>> newer xorg-intel driver from backports). I also read somewhere that
>> there were some "issues" with having the hardware virtualization
>> extensions enabled in BIOS (can't remember what the issues were) so I
>> disabled those after running the apt-get upgrade and rebooting.
>>
>> Never gone this long without a reboot so I guess perhaps I'm good. But
>> if this was indeed a software caused reboot, I'd like to know what
>> setting I need to change so that debian would just hang at a kernel
>> panic screen (or something similar) instead of just an instant dump and
>> reboot leaving me thinking that it is hardware issues (which it may
>> still be....)
>>
>>
>> Regards,
>> Samuel Smith
>>
> 
> 
> Guess I spoke too soon. About 10 days after I posted the above, the 
> laptop randomly rebooted. :sigh:
> 
> 


And for my hopefully final update..... I upgraded from jessie to stretch 
and about 2 weeks after that I got a random reboot. Figured that ruled 
out any software issue. Went ahead and bought a new board off of ebay 
and judging by the lack of a serial number in the bios screen, I'd say 
it was from an old stock pile destined for RMA warranty repairs. 
Nonetheless, after a month of swapping the board, I've not had any 
further problems.

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#186459

FromSam Smith <debian@net153.net>
Date2017-09-05 06:50 +0200
Message-ID<umdYd-6w4-1@gated-at.bofh.it>
In reply to#186093
On 08/28/2017 03:32 PM, Sam Smith wrote:
> On 06/13/2017 02:27 PM, Sam Smith wrote:
>> On 05/12/2017 03:38 PM, Sam Smith wrote:
>>> On 01/20/2017 08:04 PM, Sam Smith wrote:
>>>> I'll try to keep this short. I bought a used Lenovo T520 back in 
>>>> May. It
>>>> had the motherboard with nvidia GPU. Because it sucks power and doesn't
>>>> really have good suspend/resume support, I bought a used mother board
>>>> off of ebay that only had intel integrated graphics and I swapped it
>>>> out. All was well and I had installed in it 8gb +4gb of ram.
>>>>
>>>> It ran like that for about 8 weeks before I bought an 8gb stick and
>>>> stuck that in, so then I had 8gb + 8gb of ram. After about 6 weeks of
>>>> running like, it randomly rebooted overnight. I shrugged it off and
>>>> thought maybe the power went out or something (even though it had a
>>>> battery in it). But then about 2 weeks later it did it again..and then
>>>> two weeks after that. So I pulled out the new 8gb stick I had put in 
>>>> and
>>>> let it run with just one 8gb stick. It ran like that for about 10 weeks
>>>> without a problem. I put the old 4gb stick in just for fun, bringing it
>>>> back to the original 8gb + 4gb configuration. But about 2 weeks 
>>>> later it
>>>> rebooted again. At that point I bought a matched 16gb kit (8gb + 8gb)
>>>> from new egg that seemed to come recommended from google searching for
>>>> compatible ram for this model. But just a couple of days ago (about 3
>>>> weeks after installing it), it rebooted by itself.
>>>>
>>>> I am kind of at a loss here now. I can buy another motherboard and swap
>>>> it out again, but that takes a few hours and I don't feel like doing 
>>>> it.
>>>> The cooling and thermal stuff is all good on the laptop,I've ran 
>>>> prime95
>>>> and video encoding for hours and it is fine (temps stay below 80* at
>>>> least, normal usage is 40-55*). I've also ran memtest for a few hours.
>>>>
>>>> What I find weird is that the machine suddenly reboots. At least a few
>>>> years ago, ram issues would just lead to a kernel panic screen. But 
>>>> with
>>>> this, the machine is just like someone pulled the plug and rebooted it.
>>>> I started to wonder if there is some built in watchdog somewhere that
>>>> will reboot the machine if it hangs, but I can't tell? Other than that,
>>>> if this is the kernel that is rebooting the machine, is there any way I
>>>> can get it to dump some info somewhere before it fully reboots? 
>>>> Before I
>>>> go through the pain of swapping the board again, I'd just like to 
>>>> really
>>>> know that this is a hardware issue and not the kernel detecting
>>>> something and just choosing to reboot...
>>>>
>>>> Thanks for any info,
>>>>
>>>> Sam
>>>>
>>>
>>> Just an update. My uptime is now 80 days and I haven't had any random
>>> reboots. The only thing I did was pull in the latest apt-get updates
>>> (which took me from Jessie 6.6 to 6.7 I think, but also installed a
>>> newer xorg-intel driver from backports). I also read somewhere that
>>> there were some "issues" with having the hardware virtualization
>>> extensions enabled in BIOS (can't remember what the issues were) so I
>>> disabled those after running the apt-get upgrade and rebooting.
>>>
>>> Never gone this long without a reboot so I guess perhaps I'm good. But
>>> if this was indeed a software caused reboot, I'd like to know what
>>> setting I need to change so that debian would just hang at a kernel
>>> panic screen (or something similar) instead of just an instant dump and
>>> reboot leaving me thinking that it is hardware issues (which it may
>>> still be....)
>>>
>>>
>>> Regards,
>>> Samuel Smith
>>>
>>
>>
>> Guess I spoke too soon. About 10 days after I posted the above, the 
>> laptop randomly rebooted. :sigh:
>>
>>
> 
> 
> And for my hopefully final update..... I upgraded from jessie to stretch 
> and about 2 weeks after that I got a random reboot. Figured that ruled 
> out any software issue. Went ahead and bought a new board off of ebay 
> and judging by the lack of a serial number in the bios screen, I'd say 
> it was from an old stock pile destined for RMA warranty repairs. 
> Nonetheless, after a month of swapping the board, I've not had any 
> further problems.
> 
> 


Well I guess I really spoke too soon.... Just got a random reboot a 
minute ago... Pretty much at a loss now. The only thing that hasn't been 
replaced now is the CPU, battery, and power adapter. I do have a spare 
battery and power adapter. Guess I'll try running with those for a month 
or so and see what happens. Though not really sure how either one of 
those would make the computer reboot randomly once a month. Laptop is 
mounted in a docking station. At least for the last 6 months, every 
reboot was while it was docked. But I do remember times last year 
sitting at the kitchen table undocked and getting a reboot so I don't 
think the docking station is the issue.. But have no idea now :/

Regards,

[toc] | [prev] | [next] | [standalone]


#186465

Fromrhkramer@gmail.com
Date2017-09-05 13:30 +0200
Message-ID<umkdk-21X-23@gated-at.bofh.it>
In reply to#186459
On Tuesday, September 05, 2017 12:46:58 AM Sam Smith wrote:
> Well I guess I really spoke too soon.... Just got a random reboot a
> minute ago... Pretty much at a loss now. The only thing that hasn't been
> replaced now is the CPU, battery, and power adapter. I do have a spare
> battery and power adapter. Guess I'll try running with those for a month
> or so and see what happens. Though not really sure how either one of
> those would make the computer reboot randomly once a month. Laptop is
> mounted in a docking station. At least for the last 6 months, every
> reboot was while it was docked. But I do remember times last year
> sitting at the kitchen table undocked and getting a reboot so I don't
> think the docking station is the issue.. But have no idea now :/

I haven't paid much attention to this before today, but, if I had a problem 
with unexplained reboots, the first area I'd look at is the power supply 
"chain"--that is, the battery, the connections between the battery and the 
laptop, power "glitches" to the house,etc.

I run a laptop with a known bad battery--if I disconnect the power supply it 
crashes in seconds.  OTOH, if your battery is good, it serves as a (long 
lived) UPS--you should be able to ride out hours long power glitches.

If I had a known good battery, I might try examining the contacts between the 
battery and the laptop--are they clean / shiny, is the "springy side" still 
"springy", does the battery fit snugly in the case or is there enough clearance 
for it to possibly move and break contact with the laptop?  I might even try  
picking up the laptop and reasonably gently shaking it (while running) to see 
if it reboots.  (You don't want to shake it so hard that you damage something 
else.)

If you have a known bad battery, I'd look at the chain from the power outlet 
through the various cords and contacts on both sides of the power adapter.  
Try shaking the power adapter.

Is the power to your house reliable--is there any chance you've had brief 
power outages overnight?  (In the US, most electric utilities have automatic 
reclosers on the power line circuit breakers--if they detect a fault they 
open, then try closing again after a few seconds (in hopes that either the 
fault has cleared (maybe a shorting tree branch has either blown or burned),  
away, open again if there is still a fault, again try to reclose, after a few 
seconds.  In most cases, they try this something like 3 times, with a somewhat 
longer delay before the last retry.

Oh wait, you have (presumably known good) spare battery and power adapter--try 
those.

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#186475

FromFungi4All <fungilife@protonmail.com>
Date2017-09-05 21:50 +0200
Message-ID<ums1b-7ak-1@gated-at.bofh.it>
In reply to#186465

[Multipart message — attachments visible in raw view] — view raw

> From: rhkramer@gmail.com
> To: debian-user@lists.debian.org
>
> On Tuesday, September 05, 2017 12:46:58 AM Sam Smith wrote:
>> Well I guess I really spoke too soon.... Just got a random reboot a
>> minute ago... Pretty much at a loss now. The only thing that hasn"t been
>> replaced now is the CPU, battery, and power adapter. I do have a spare
>> battery and power adapter. Guess I"ll try running with those for a month
>> or so and see what happens. Though not really sure how either one of
>> those would make the computer reboot randomly once a month. Laptop is
>> mounted in a docking station. At least for the last 6 months, every
>> reboot was while it was docked. But I do remember times last year
>> sitting at the kitchen table undocked and getting a reboot so I don"t
>> think the docking station is the issue.. But have no idea now :/
>
> I haven"t paid much attention to this before today, but, if I had a problem
> with unexplained reboots, the first area I"d look at is the power supply
> "chain"--that is, the battery, the connections between the battery and the
> laptop, power "glitches" to the house,etc.
>
> I run a laptop with a known bad battery--if I disconnect the power supply it
> crashes in seconds. OTOH, if your battery is good, it serves as a (long
> lived) UPS--you should be able to ride out hours long power glitches.
>
> If I had a known good battery, I might try examining the contacts between the
> battery and the laptop--are they clean / shiny, is the "springy side" still
> "springy", does the battery fit snugly in the case or is there enough clearance
> for it to possibly move and break contact with the laptop? I might even try
> picking up the laptop and reasonably gently shaking it (while running) to see
> if it reboots. (You don"t want to shake it so hard that you damage something
> else.)
>
> If you have a known bad battery, I"d look at the chain from the power outlet
> through the various cords and contacts on both sides of the power adapter.
> Try shaking the power adapter.
>
> Is the power to your house reliable--is there any chance you"ve had brief
> power outages overnight? (In the US, most electric utilities have automatic
> reclosers on the power line circuit breakers--if they detect a fault they
> open, then try closing again after a few seconds (in hopes that either the
> fault has cleared (maybe a shorting tree branch has either blown or burned),
> away, open again if there is still a fault, again try to reclose, after a few
> seconds. In most cases, they try this something like 3 times, with a somewhat
> longer delay before the last retry.
>
> Oh wait, you have (presumably known good) spare battery and power adapter--try
> those.

Power is not the only thing that will shutdown a laptop, but rebooting automatically
sounds a bit strange in itself.  Most I have seen take your input to power-up unless
a specific instruction is given to reboot.
Are you sure you have not set a hot-key for reboot?
Is it possible a fan or an overheating alarm is not shutting it off? But then again, you
are talking about a reboot not a shutdown.
Anything else from the manufacturer that is triggering a reboot?
If the operating system is at fault for ordering a reboot that will be in the logs.
If it is a mechanical shutdown it may be instant and not giving enough warnings
to the system to log anything.
So why is it rebooting?  Maybe it goes through an interruption that is not a shutdown
so instantly the system is trying to recuperate from the interruption.  Possibly insufficient
or too much voltage is going through a self protected circuit which causes the interruption
and then allows current back through again, giving you the illusion of a reboot.
Sometimes disk drives on their way out draw too much current, or cd/dvd drives, which
the power supply can't keep up with which cause an interruption till enough juice is
built up to get the motor rolling again.  It could be as simple a small capacitor in one of
the drives.  Do your drive/s go to sleep in some state to preserve power?  Look at your
power settings and turn off the energy conserving options.
Maybe boot from usb into a live system, disable the drives from the bios and run a
usb stick or drive.  If the problem comes up again then it is not drive related or operating
system related.  Operating systems are much more likely to freeze up than to order
an anauthorized shut/reboot.  I am willing to bet it is a mechanical/electric glitch and
not an OS problem.

Unless you have discovered a new black-hole in systemd  (rust never sleeps). ;)

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#186476

FromSam Smith <debian@net153.net>
Date2017-09-05 21:50 +0200
Message-ID<ums1b-7ak-7@gated-at.bofh.it>
In reply to#186465
On 09/05/2017 06:25 AM, rhkramer@gmail.com wrote:
> On Tuesday, September 05, 2017 12:46:58 AM Sam Smith wrote:
>> Well I guess I really spoke too soon.... Just got a random reboot a
>> minute ago... Pretty much at a loss now. The only thing that hasn't been
>> replaced now is the CPU, battery, and power adapter. I do have a spare
>> battery and power adapter. Guess I'll try running with those for a month
>> or so and see what happens. Though not really sure how either one of
>> those would make the computer reboot randomly once a month. Laptop is
>> mounted in a docking station. At least for the last 6 months, every
>> reboot was while it was docked. But I do remember times last year
>> sitting at the kitchen table undocked and getting a reboot so I don't
>> think the docking station is the issue.. But have no idea now :/
> 
> I haven't paid much attention to this before today, but, if I had a problem
> with unexplained reboots, the first area I'd look at is the power supply
> "chain"--that is, the battery, the connections between the battery and the
> laptop, power "glitches" to the house,etc.
> 
> I run a laptop with a known bad battery--if I disconnect the power supply it
> crashes in seconds.  OTOH, if your battery is good, it serves as a (long
> lived) UPS--you should be able to ride out hours long power glitches.
> 
> If I had a known good battery, I might try examining the contacts between the
> battery and the laptop--are they clean / shiny, is the "springy side" still
> "springy", does the battery fit snugly in the case or is there enough clearance
> for it to possibly move and break contact with the laptop?  I might even try
> picking up the laptop and reasonably gently shaking it (while running) to see
> if it reboots.  (You don't want to shake it so hard that you damage something
> else.)
> 
> If you have a known bad battery, I'd look at the chain from the power outlet
> through the various cords and contacts on both sides of the power adapter.
> Try shaking the power adapter.
> 
> Is the power to your house reliable--is there any chance you've had brief
> power outages overnight?  (In the US, most electric utilities have automatic
> reclosers on the power line circuit breakers--if they detect a fault they
> open, then try closing again after a few seconds (in hopes that either the
> fault has cleared (maybe a shorting tree branch has either blown or burned),
> away, open again if there is still a fault, again try to reclose, after a few
> seconds.  In most cases, they try this something like 3 times, with a somewhat
> longer delay before the last retry.
> 
> Oh wait, you have (presumably known good) spare battery and power adapter--try
> those.
> 


The power "chain" imo seems good. Never heard of a power adapter going 
bad.. but I do have a spare. The battery I normally use is a smaller 6 
cell I bought off of ebay, it is pretty wore out. It reports 50% 
capacity loss but runs for about 2 hours. I only bought it because the 
stock battery is a bigger 9 cell that is bulky and heavy so around the 
house I just leave the smaller one in. I'll use my spares for now. As 
for household power, it is normally plugged into my UPS (apc smartups, 
not the cheap consumer version).

CPUs seem pretty cheap on ebay, so I could try that. But it seems that 
CPU issues would cause more problems than a random reboot once a month.

One other thing, I do run the 'thinkfan' fan control program. You can 
set fan levels by temp. It was made for thinkpads made probably 10 years 
ago, but still seems to work on the newer models. But I do know the 
embedded controller on the T520 series is different than prior models. 
So perhaps taking control of the fan causes the EC to detect this as a 
fault. And maybe, just maybe, after so many "faults" it will kill power 
to the machine. A wild idea but who knows. I've also since disabled the 
thinkfan service.

Other than these, not sure what else. Kinda strange, but definitely 
annoying.

Regards,

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