Questions on How Xorg handle ACPI
mjg59 at srcf.ucam.org
Wed Feb 18 05:45:08 PST 2009
On Wed, Feb 18, 2009 at 10:41:31AM +0800, sheldon wrote:
> I'm trying to find how Xorg handles ACPI (s3 and s4). It seems that Xorg
> handles S3/S4( suspend and resume) is just the same as it process VT
> switching, for both the flow is WaitFofSomething( )-> WakeUpHandle( ) ->
> xf86Wakeup( ) -> xf86VTswitch( ) .
Xorg doesn't handle S3/S4.
> Question 1. Is any different between Xorg handle S3/S4 and VT Switching?
No - suspend/resume will typically be implemented by VT switching (see
pm-utils or the kernel's own VT switching in kernel/power/main.c)
> BUT, xf86HandlePMEvents( ) is never called (I'm using Ubuntu8.10, Xorg
> 1.5.2 *C- a debug version ,compiled by myself). In my system S3/S4 is OK
> in both console and X.
> Question 2. I don't know why, Is Xorg don't need to read ACPI Events ? or
> using some other methods
There are no ACPI events that Xorg can usefully respond to directly.
They're all passed to userspace which will take appropriate actions.
Matthew Garrett | mjg59 at srcf.ucam.org
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