Bug 11132

Summary:	evaluate ACPI 3.0 _TTS
Product:	ACPI	Reporter:	Len Brown (lenb)
Component:	Power-Sleep-Wake	Assignee:	ykzhao (yakui.zhao)
Status:	CLOSED PATCH_ALREADY_AVAILABLE
Severity:	normal	CC:	acpi-bugzilla
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.27	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	the patch for supporting _TTS object

Description Len Brown 2008-07-20 14:16:52 UTC

_TTS was added to the suspend/resume order in ACPI 3.0.
I have not (yet) seen a system that implements _TTS.

However, Linux should support _TTS so that we are
not suprised when/if it suddenly appears in production BIOS.

I expect this simply means...

acpi_suspend_begin(pm_state):
  _TTS(acpi_state)

and

acpi_pm_end()
  _TTS(0)

Comment 1 ykzhao 2008-08-11 19:31:39 UTC

Created attachment 17181 [details]
the patch for supporting _TTS object

This patch is to add the support for the _TTS object.

The _TTS control method is executed by the OSPM at the beginning of the sleep transition process for S1,S2, S3, S4, and orderly S5 shutdown. The target sleep state is passed to the _TTS control method.

The _TTS control method is also executed by the OSPM at the end of any sleep transition process when the system transitions to S0 from S1, S2, S3, or S4. The working state value (0) is passed to the _TTS control method.

Comment 2 ykzhao 2008-08-11 19:39:14 UTC

The patch is available and the bug will be marked as resovled.

But unfortunately there is no system that implements the _TTS object and we have no chance to test it. When the exists the system that implements the _TTS object and there exist some problems related with the _TTS object, please reopen it.

Thanks.

Comment 3 Len Brown 2008-10-16 18:04:39 UTC

latest version of this patch is in the acpi-test tree,
staged for 2.6.28.1

Author: Zhao Yakui <yakui.zhao@intel.com>  2008-08-11 22:20:22
Committer: Len Brown <len.brown@intel.com>  2008-10-16 20:45:18
Parent: a68823ee5285e65b51ceb96f8b13a5b4f99a6888 (ACPI: Clear WAK_STS on resume)
Child:  a6629105dd03d370fcb31e97bddf223fa4bb651e (ACPI suspend: Always use the 32-bit waking vector)
Branch: suspend
Follows: v2.6.27
Precedes: 

    ACPI: Add the support for _TTS object

Comment 4 Len Brown 2008-10-24 23:12:01 UTC

shipped in linux-2.6.28-rc1
closed

commit e49f711cc8f3bf8d719a9f5c86e79ecc0a72bf70
Author: Zhao Yakui <yakui.zhao@intel.com>
Date:   Tue Aug 12 10:20:22 2008 +0800

    ACPI: Add the support for _TTS object