Re: if power button pressed 1x it creates the same ACPI event twice

Sander Eikelenboom
2015-01-19T13:21:59Z

Monday, January 19, 2015, 2:09:34 PM, you wrote:

> Hello Sander,

> Tuesday, January 13, 2015, 5:47:24 PM, you wrote:

>> Tuesday, January 13, 2015, 5:35:10 PM, you wrote:

>>> Hi Rafael / Len,

>>> When i press the power-button on my intel NUC, i get twp ACPI power-events shortly
>>> after one another (within a second), instead of just one.

>>> It doesn't matter if i have the old /proc/acpi interface enabled or disabled in the kernel config.

>>> I have tested a few older kernels lingering around on the box and 3.14 already
>>> has this problem. 3.2 (from the debian repo) doesn't have the problem, it only
>>> fires one event.

>>> I did find another report:
>>> Re: lenovo ultrabay docking station: if power button pressed 1x it creates 2x the same ACPI event
>>> http://www.spinics.net/lists/linux-acpi/msg54723.html
>>> But that hasn't come to a conclusion ...

>>> Unfortunately 3.2 - 3.19-rc4 is a bit of a largish bisect window, so that's
>>> unfeasible :-)

>>> I compiled in apci debug support and tried:
>>> echo "0x00080000" > /sys/module/acpi/parameters/debug_layer
>>> echo "0xffffffff" > /sys/module/acpi/parameters/debug_level

>>> But i don't get any extra output in dmesg ?

>>> Do you have any ideas for a debug patch or better values to figure out what is going on ?

>>> --
>>> Sander

>> Hmm is it normal that it registers in this way (twice) ?

>> [ 5.817980] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0
>> [ 5.837907] ACPI: Power Button [PWRB]
>> [ 5.847540] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input1
>> [ 5.866915] ACPI: Power Button [PWRF]

>> --
>> Sander

> Hi Rafael / Len,

> Got some more time to test:

> - It's indeed giving one event for both registered power buttons (which in reality
> are just one hardware button) printing acpid's "%e" revealed that:
> 1421672289-161192235 | button/power PBTN 00000080 00000000
> 1421672289-279647745 | button/power LNXPWRBN:00 00000080 00000004

> So i tested on another box (amd instead of intel), and that also registers 2
> power buttons:

> # dmesg | grep -i button
> [ 13.435060] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0
> [ 13.435294] ACPI: Power Button [PWRB]
> [ 13.435495] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input1
> [ 13.435683] ACPI: Power Button [PWRF]
>
> So the question is .. should both register and should scripts adjust to pick up just one of them ?
> Or can, as a more general solution, just one be ignored when registering ?

> --
> Sander

Whoops sorry for the fragmentation of the report ... but just thought the output
under kernel 3.2.0 could be handy as well .. as that only fires one event:

[ 4.003753] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input1
[ 4.003838] ACPI: Power Button [PWRB]
[ 4.003977] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input2
[ 4.005530] ACPI: Power Button [PWRF]

It registers also two ..
But when the power button is pressed only fires this one:

1421673524-817561070 | button/power PBTN 00000080 00000000

--
Sander