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Re: Laptop randomly reboots

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On 09/04/2017 11:46 PM, Sam Smith wrote:
> 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,
> 


So for my usual 6 month update:

Still scratching my head on this one. So far, tried various different 
ram, replaced motherboard, same issues on two different OS's (jessie and 
stretch), a few months a ago replaced battery with a brand new official 
one, tried various different power adapters... and still get the same 
random reboot.

For the last couple of months,  I seem to get around the problem by 
rebooting the laptop once every two weeks, and right after reboot I 
suspend and then resume. Seems if I just reboot it and let it sit there, 
it will reboot on its own after a couple of days. Otherwise the random 
reboots seem to always happen after being on for more than a month or so.

The only thing left is the CPU. Not sure if I am going to mess with it 
anymore though. I did find some "unofficial" bios versions out there 
that people have modified and tweaked various things at that level. 
Sounds risky, but I do still have the old motherboard so if I totally 
trash it by flashing I could always put that one back in (which would be 
the 4th time I've had the motherboard out lol) I need to flash bios to 
get the new microcodes for the spectre cpu flaw stuff anyway...

--Sam

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Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2018-05-19 01:20 +0200
  Re: Laptop randomly reboots Hans <hans.ullrich@loop.de> - 2018-05-19 09:30 +0200
    Re: Laptop randomly reboots Cindy-Sue Causey <butterflybytes@gmail.com> - 2018-05-19 16:30 +0200
    Re: Laptop randomly reboots Sam Smith <debian@net153.net> - 2018-05-19 20:00 +0200
      Re: Laptop randomly reboots Hans <hans.ullrich@loop.de> - 2018-05-19 20:10 +0200
      Re: Laptop randomly reboots David Wright <deblis@lionunicorn.co.uk> - 2018-05-21 22:50 +0200

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