Bug 15785

Summary:	buggy _PPC return value when laptop boots without battery -- Thinkpad T61
Product:	ACPI	Reporter:	Zhang Rui (rui.zhang)
Component:	Power-Processor	Assignee:	Zhang Rui (rui.zhang)
Status:	CLOSED DOCUMENTED
Severity:	normal	CC:	acpi-bugzilla
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:

Description Zhang Rui 2010-04-15 01:47:19 UTC

The _PPC method on T61 returns 2 when the laptop boots without battery.
This is meaningless because it disables the processor P0 and P1 state in AC mode.

Comment 1 Zhang Rui 2010-04-15 02:15:16 UTC

Len, " This is a T61 specific bug, and I don't want to mess up the general code path to address a BIOS bug on a single machine.. Another way is to boot the machine with a battery in it, like everybody else does. If you need the battery out of the machine for measurements, take it out after boot."