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Posts: 15 | Thanked: 26 times | Joined on Sep 2016 @ Poland
#1
The Thing:
when walking or placing the N900 in a pocket of trousers or a jacket somehow it goes down, probably by unknowingly pressing the power button. It happens sometimes, there's no pattern nor probable bug causing this. I can't find any log of power on/off.

Potential solution:
disable the long-press on power button through file in (not sure about this) /sys/devices/platform/gpio-switch/

Advantages:
N900 won't turn off anymore by incidental long-press.

Disadvantages:
When stuck or in need to do a hard restart you will have to remove battery.

Does anyone have an idea how to debug or just disable the button?
 

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#2
How do you know it was the power button press and not, for example, a dodgy battery?

The simplest solution is a hardware mod: glue a small ring (for example, a washer) to the case around the power button. You will still be able to press it with a tool but not by accident.
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#3
Originally Posted by pichlo View Post
How do you know it was the power button press and not, for example, a dodgy battery?
Well, it happens only when in my pocket.
 

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#4
Originally Posted by ynzinier View Post
Well, it happens only when in my pocket.
Most probably it is bad battery/weak battery holder springs.
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#5
Checked in another pocket and there was no such accident.
Back to the question: how to disable this functionality with some software edit?
 

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#6
Originally Posted by ynzinier View Post
Checked in another pocket and there was no such accident.
Back to the question: how to disable this functionality with some software edit?
Could well be I am wrong here, but the long press cannot be masked in software; it triggers a hard shutdown even in case where cpu is totally locked.
 

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#7
...all of which brings us back neatly to the weak battery contacts.
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#8
Originally Posted by juiceme View Post
Could well be I am wrong here, but the long press cannot be masked in software; it triggers a hard shutdown even in case where cpu is totally locked.
Hm, that makes the problem harder to solve.

Originally Posted by pichlo View Post
...all of which brings us back neatly to the weak battery contacts.
I can fold them to better connect to board (fold the battery holders too), but even after falling from about 1 m it didn't switch off.
 

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#9
I seriously doubt that this should not be configurable somehow.
Linux is in basics just configs in file system . Even hardware.
Just, no one have been told where it's hidden.
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#10
Originally Posted by nieldk View Post
I seriously doubt that this should not be configurable somehow.
Linux is in basics just configs in file system . Even hardware.
Just, no one have been told where it's hidden.
heh, if there's a rc delay connected to the power supply enable line I sure would like to see that configured by software
 

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