kernel >= 2.6.8 halts IBM ThinkCentre

kernel >= 2.6.8 halts IBM ThinkCentre

[Rafael Ávila de Espíndola]

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I have used svn to search where the bug was added. It was in the commit with 
BKrev 40d318ecmZTh_TlJh147qeftto1qZw and it was done in 2004-06-18 13:31:40. 
Investigating further showed that the addition of the line 

acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);

causes the problem (see the attached patch). The comment

 /* disable all links -- to be activated on use */ 

suggests that maybe the some driver is not re-activating it.

I have attached the output of dmesg, dmidecode, acpidmp, lspci 
and /proc/interrupts

Rafael Ávila de Espíndola

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Index: drivers/acpi/pci_link.c
===================================================================
--- drivers/acpi/pci_link.c	(revision 19748)
+++ drivers/acpi/pci_link.c	(working copy)
@@ -703,6 +703,9 @@
 	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);
 

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