Patch disabling ACPI C3 - Revision history

Akw at 20:38, 7 February 2012

2012-02-07T20:38:22Z

Akw: applied diff tag

2007-11-08T17:54:15Z

applied diff tag

Thinker: No patch needed

2005-10-25T10:04:30Z

No patch needed

217.73.103.144 at 04:20, 18 December 2004

2004-12-18T04:20:08Z

Akw: short patches can also be presented inline

2004-09-27T08:15:40Z

short patches can also be presented inline

Wyrfel: added Category

2004-09-26T20:36:53Z

added Category

Wyrfel: transformed into separate page

2004-09-26T20:25:09Z

transformed into separate page

New page

On some Thinkpads there is a problem with the ipw2100 wireless LAN driver when C3 is enabled. It results in frequent firmware restarts due to data corruption. If you see this problem frequently and want to disable C3 but still use C2 and the thermal management, you can apply [http://fionn.de/no-c3.patch this] patch to the file <tt>/usr/src/linux/drivers/acpi/processor.c</tt>.<br>
<tt>APPLY THIS PATCH ONLY IF YOUR SYSLOG REPORTS DRIVER RESTARTS AND FIRMWARE RELOADS ALL THE TIME!</tt><br>
This patch causes slightly shorter battery life.

If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.

@@ Line 6: / Line 6: @@
 If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.
-<diff>
+<source lang="diff">
 --- processor.c.orig    Wed Mar  3 14:10:42 2004
 +++ processor.c Thu Mar  4 17:56:02 2004
@@ Line 21: / Line 21: @@
           * have the first (boot) processor with a valid PBLK address while
           * all others have a NULL address.
-</diff>
+</source>
 [[Category:Patches]]

@@ Line 6: / Line 6: @@
 If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.
- --- processor.c.orig    Wed Mar  3 14:10:42 2004
+        /*
- +++ processor.c Thu Mar  4 17:56:02 2004
++        * Hack: Disable bus master controller to disable C3 power transitions
- @@ -1598,6 +1598,11 @@
++        */
-                         "No bus mastering arbitration control\n"));
++       pr->flags.bm_control = 0;
-−
++
-         /*
++       /*
- +        * Hack: Disable bus master controller to disable C3 power transitions
+         * Evalute the processor object.  Note that it is common on SMP to
- +        */
+         * have the first (boot) processor with a valid PBLK address while
- +       pr->flags.bm_control = 0;
+         * all others have a NULL address.
+</diff>
 [[Category:Patches]]

@@ Line 1: / Line 1: @@
-On some Thinkpads there is a problem with the ipw2100 wireless LAN driver when C3 is enabled. It results in frequent firmware restarts due to data corruption. If you see this problem frequently and want to disable C3 but still use C2 and the thermal management, you can apply [http://fionn.de/no-c3.patch this] patch to the file <tt>/usr/src/linux/drivers/acpi/processor.c</tt>.<br>
+On some Thinkpads there is a problem with the [http://ipw2100.sf.net ipw2100] wireless LAN driver when C3 is enabled. It results in frequent firmware restarts due to data corruption. If you see this problem frequently and want to disable C3 but still use C2 and the thermal management, you can apply [http://fionn.de/no-c3.patch this] patch to the file <tt>/usr/src/linux/drivers/acpi/processor.c</tt>.<br>
 <tt>APPLY THIS PATCH ONLY IF YOUR SYSLOG REPORTS DRIVER RESTARTS AND FIRMWARE RELOADS ALL THE TIME!</tt><br>
 This patch causes slightly shorter battery life.
@@ Line 22: / Line 22: @@
 [[Category:Patches]]

← Older revision		Revision as of 08:15, 27 September 2004
Line 4:		Line 4:

	If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.		If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.
		+
		+	--- processor.c.orig Wed Mar 3 14:10:42 2004
		+	+++ processor.c Thu Mar 4 17:56:02 2004
		+	@@ -1598,6 +1598,11 @@
		+	"No bus mastering arbitration control\n"));
		+
		+	/*
		+	+ * Hack: Disable bus master controller to disable C3 power transitions
		+	+ */
		+	+ pr->flags.bm_control = 0;
		+	+
		+	+ /*
		+	* Evalute the processor object. Note that it is common on SMP to
		+	* have the first (boot) processor with a valid PBLK address while
		+	* all others have a NULL address.


	[[Category:Patches]]		[[Category:Patches]]

← Older revision		Revision as of 20:36, 26 September 2004
Line 4:		Line 4:

	If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.		If you don't want to patch your kernel, sacrifice C3 entirely and/or use WLAN mainly on AC then you can alternatively add rules to modules.conf to unload the acpi processor module as long as ipw2100 is loaded.
		+
		+
		+	[[Category:Patches]]