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Re: Laptop randomly reboots

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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

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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

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