RE: Why don't we use _TTS method?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




> -----Original Message-----
> From: linux-acpi-owner@xxxxxxxxxxxxxxx [mailto:linux-acpi-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Rafael J. Wysocki
> Sent: Thursday, May 03, 2007 1:02 PM
> To: ACPI Devel Maling List
> Cc: pm list; Pavel Machek
> Subject: Why don't we use _TTS method?
> 
> Hi,
> 
> I've got two questions regarding the implementation of the ACPI
> poweroff/sleep
> code in drivers/acpi/sleep and drivers/acpi/hardware .
> 
> 1) We don't seem to use the _TTS system-control method, although the
ACPI
> specification (ACPI 3.0b) says that this method should be used for
> intiating
> and finishing power transitions.  Could you please tell me why we
don't
> use it?
> 
[Moore, Robert] 

Probably because it's fairly new and it takes a long time for these
things to appear in real machines. Also, needs to be supported in
Windows before we ever see it in real machines.

> 2) In the functions acpi_enter_sleep_state_prep(),
> acpi_enter_sleep_state(),
> acpi_leave_sleep_state() we manipulate GPEs quite extensively (we
disable
> and enable them for a couple of times during a transition), although
the
> specification doesn't tell anything about that explicitly.  Could you
> please
> explain to me what the purpose of that is?
> 
[Moore, Robert] 

There a wake GPEs and runtime GPEs that need to be managed separately.
We want to make sure that only the "Wake" GPEs are enabled as we goto
sleep.

Bob


> Greetings,
> Rafael
> 
> 
> --
> If you don't have the time to read,
> you don't have the time or the tools to write.
> 		- Stephen King
> -
> To unsubscribe from this list: send the line "unsubscribe linux-acpi"
in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
-
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux IBM ACPI]     [Linux Power Management]     [Linux Kernel]     [Linux Laptop]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux