Bug 13965

Summary:	_DIS Interrupt Links prevents power button events -- MSI-6167
Product:	ACPI	Reporter:	Ryan Underwood (nemesis)
Component:	Config-Interrupts	Assignee:	Zhang Rui (rui.zhang)
Status:	CLOSED UNREPRODUCIBLE
Severity:	normal	CC:	acpi-bugzilla, lenb, rui.zhang
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.30	Subsystem:
Regression:	Yes	Bisected commit-id:

Description Ryan Underwood 2009-08-11 21:35:56 UTC

Reopening bug 6117
http://bugzilla.kernel.org/show_bug.cgi?id=6117

Most recent kernel where this bug did not occur: 2.4.27-pre6
Distribution: Debian
Hardware Environment: MSI MS-6167 latest BIOS
Software Environment: 
Problem Description:
This change to drivers/acpi/pci_link.c from 2.4.27-pre6 to -rc1 broke the ACPI 
button:
@@ -698,6 +679,9 @@
 	acpi_link.count++;
 
 end:
+	/* disable all links -- to be activated on use */
+	acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
+
 	if (result)
 		kfree(link);

Steps to reproduce:
Build 2.4.27-rc1 without these lines, ACPI button works
build with these lines, ACPI button does not generate IRQ or events.

The DSDT is posted on sourceforge.

Comment 1 Zhang Rui 2009-08-12 07:11:08 UTC

does the problem still exist in the latest upstream kernel?
If yes, does the problem go away if you comment this line?

Comment 2 Ryan Underwood 2009-08-13 22:27:06 UTC

Actually, it works with latest upstream and with 2.6.30.  The funny part was that I was using an old acpid that was attempting to use /proc/acpi/event and failing silently when it was not available.  After noticing that the ACPI button was in fact generating interrupts correctly, I upgraded the acpid and now the system powers off correctly.  Closing bug, thanks!