Dear Linux folks,
due to another problem [1] I noticed that X recognizes two power
buttons.
$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ HID 1241:1122 id=8 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Power Button id=7 [slave keyboard (3)]
↳ Logitech Logitech USB Keyboard id=9 [slave keyboard (3)]
↳ Logitech Logitech USB Keyboard id=10 [slave keyboard (3)]
This is due to Linux setting up two of these buttons.
$ dmesg | grep -i "power button"
[ 16.785490] input: Power Button as /devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input3
[ 16.785496] ACPI: Power Button [PWRB]
[ 16.785696] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input4
[ 16.785699] ACPI: Power Button [PWRF]
I am not sure if this is an input or ACPI problem and if it is a problem
at all. Pressing the power button does generate the correct events – I
think. At least the system shuts down or suspends just fine. It just
seems weird that two of these buttons are set up.
This seems to be a common “problem” as this happens with for example
ASUS M2A-VM [2] and ASRock A780FullHD.
Searching the WWW I did not find a lot of information. Just an article
in the Gentoo Wiki suggesting that only one button should be recognized
[3]. Though I emphasize again that the power button works fine!
Thanks,
Paul
[1] https://bugs.freedesktop.org/show_bug.cgi?id=52046#c5
[2] https://bugzilla.kernel.org/show_bug.cgi?id=42587#c11
[3] http://en.gentoo-wiki.com/wiki/ACPI/Fix_common_problems#Power_and.2For_Sleep_Buttons_Don.27t_Work
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