Re: Weird random reboot -- thinkpad x220
On 4/30/14, Paul Seyfert <pseyfert@mathphys.fsk.uni-heidelberg.de> wrote:
> On 30.04.2014 10:35, Zenaan Harkness wrote:
>> On 4/30/14, Paul Seyfert <pseyfert@mathphys.fsk.uni-heidelberg.de> wrote:
>>> you're not paranoid, I've seen sudden reboots running wheezy (when it
>>> was testing and i think even since it's stable) on my x220 as well.
>>> though very rarely. i don't recall having seen it since September. but i
>>> remember it even happened once when i was sitting in front of it.
>>>
>>> I'm sorry i have to date not the slightest idea how to reproduce the
>>> behaviour.
>>
>> See below.
>>
>>> the time i happened to see it, it looked like the power went out (with
>>> PSU connected and battery fully charged). after about a second in which
>>> i wondered what was going on, the computer booted as if it was switched
>>> off and somebody pressed the power button.
>>
>> I run sid, and have reproduced this when x220 is connected to power/
>> "battery slice" which is like a docking station, but it's just a
>> battery.
>>
>> When connecting power to the slice (recommended, apparently when slice
>> is connected, should not connect power to laptop (which has its own
>> power connector of course) but to slice power connector.
>>
>> This causes instant reboot for me.
>
> hm, i use various combinations.
> * 9 cell
> * 9 cell + PSU
> * 9 cell + docking station + PSU connected to notebook
> * 9 cell + docking station + PSU connected to docking station
> * 9 cell + slice
> * 9 cell + slice + PSU connected to slice
> * 9 cell + slice + PSU connected to notebook (yes, rarely i end up in
> the not-recommended setting)
>
> it didn't occur to me that the random reboot is due to a particular
> setting, none of the settings reliably triggers the reboot.
>
>> I have not had time to check out LENOVO bios updates yet.
>>
>
> this is different for me. i had quite some problems with the very early
> bios versions of the x220 when I got it. After three updates I ended up
> with
>
> UEFI: 1.17 / ECP: 1.08
Thanks for the reference. I shall look into this at some point.
>> This is a known problem. I haven't finished reading giyf search
>> results to determine how to fix, would like to know myself of course.
>>
>> So x220 laptops have known power problems. Also with regular internal
>> battery: battery can reach a state where the ACPI (or whatever it is)
>> can no longer reliably tell you what charge state the battery is. I
>> have reverted to disabling automatic shutdown and power-low
>> notifications, since the battery status can change back and forth to
>> eg 2hrs to go, empty, 1hr55 to go, empty etc. and each "empty" causes
>> annoying pop ups.
>
>
> I think this is a different problem. For the random reboot, let me
> repeat that i didn't see a shutdown when i was present at the random
> shutdown event. the notebook was suddenly off. like removing the battery
> and unplugging the PSU. so the random reboot doesn't seem acpi related
> to me.
If you had a power brownout whilst you were away, then your random
reboot _may_ have been similar to mine - that was my suggestion. I do
not know of course.
Mine reboot can be triggered by:
a) 9-cell+slice, PSU disconnected, laptop started (even at console)
b) connect PSU to slice, witness instant reboot
Either way, it appears there are various battery issues, of one form
or another, with x220 laptop.
Good luck
Zenaan
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