Bug 4833

Summary:	ACPI: C2 no longer detected for CPU
Product:	Alternate Trees	Reporter:	Jindrich Makovicka (makovick)
Component:	mm	Assignee:	Andrew Morton (akpm)
Status:	CLOSED CODE_FIX
Severity:	normal
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.13-rc1-mm1	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	.config fix

Description Jindrich Makovicka 2005-07-02 07:26:57 UTC

Distribution: Debian Sid
Hardware Environment: Athlon XP-M 2600+, EPoX 8K9A3+ (VIA KT400)
Problem Description:

With 2.6.13-rc1-mm1, ACPI does no longer detect C2 power state for CPU, only C1,
leaving CPU running full throttle all the time. 2.6.12-mm2 still uses C2.

Steps to reproduce: happens always on my machine. config attached.

Comment 1 Jindrich Makovicka 2005-07-02 07:28:08 UTC

Created attachment 5250 [details]
.config

Comment 2 Jindrich Makovicka 2005-07-02 09:25:38 UTC

Created attachment 5251 [details]
fix

this patch adds a call to acpi_processor_power_verify(), which can set .valid
field if appropriate, enabling C2/C3 power state(s).

Comment 3 Andrew Morton 2005-07-06 01:10:18 UTC

Please email me the patch, as described in

http://www.zip.com.au/~akpm/linux/patches/stuff/tpp.txt

Comment 4 Adrian Bunk 2005-07-12 03:23:22 UTC

The patch from this bug is already included in 2.6.13-rc2-mm2.