Question on /proc/acpi/wakeup
Wakeup capable devices are listed in /proc/acpi/wakeup. For example, in my
sytem I've got:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
solitone@alan:~$ cat /proc/acpi/wakeup
Device S-state Status Sysfs node
PEG0 S3 *disabled
EC S4 *disabled platform:PNP0C09:00
HDEF S3 *disabled pci:0000:00:1b.0
RP01 S3 *disabled pci:0000:00:1c.0
RP02 S3 *disabled pci:0000:00:1c.1
RP03 S3 *disabled pci:0000:00:1c.2
ARPT S4 *enabled pci:0000:03:00.0
RP05 S3 *disabled pci:0000:00:1c.4
RP06 S3 *disabled pci:0000:00:1c.5
SPIT S3 *disabled
XHC1 S3 *enabled pci:0000:00:14.0
ADP1 S4 *disabled platform:ACPI0003:00
LID0 S4 *enabled platform:PNP0C0D:00
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It is possible to disable devices with e.g.
solitone@alan:~$ sudo echo XHC1 > /proc/acpi/wakeup
However, when system reboots such settings are lost, and /proc/acpi/wakeup is
reset to its original content.
How does this work? What is the thing that resets /proc/acpi/wakeup to its
standard content? What does this content depend on? What is that determines
whether a device is enabled or disabled in the first place?
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