ACPI/PM: Propagate power button event to user space when device wakes up #2
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Sometimes power button does not wake up the systemm and we get suspends event right after that. Here Android needs to see KEY_POWER at resume. Otherwise, its opportunistic suspend will kick in shortly.
However, other OS such as Ubuntu doesn't like KEY_POWER at resume. So add a knob "/sys/module/button/parameters/key_power_at_resume" for users to select.