On Thu, May 27, 2010 at 3:23 PM, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
Android does not only run on phones. It is possible that no android
devices have ACPI, but I don't know that for a fact. What I do know is
that people want to run Android on x86 hardware and supporting suspend
could be very benficial.
I think existing laptops (and desktops) can benefit from opportunistic
suspend support. If opportunistic suspend is used for auto-sleep after
inactivity instead of forced suspend, the user space suspend blocker
api will allow an application to delay this auto sleep until for
instance a download completes. This part could also be done with a
user-space IPC call, but having a standard kernel interface for it may
make it more common. A less common case, but more critical, is RTC
alarms. I know my desktops can wakeup at a specific time by
programming an RTC alarm, but without suspend blockers how do you
ensure that the system does not suspend right after the alarm
triggered? I have a system that wakes up at specific times requested
by my DVR application, but I cannot use this system for anything else
unless I manually turn off the DVR application's auto-sleep feature.
With suspend blockers and something like the android alarm driver, I
could use this system for more than one application that have
scheduled tasks and it would be more usable for interactive
applications.
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Arve Hjønnevåg
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