Messages in this thread Patch in this message | | | From | Thomas Schlichter <> | Subject | Re: [PATCH] cpuidle: fix new C-states not functional after AC disconnect | Date | Fri, 18 Jan 2013 21:34:29 +0100 |
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Dear Rafael,
thank you for applying Daniel's patch. I tested 3.8-rc4 and found that one patch ist still missing to fix the problem of not usable C-state after disconnect. I had it attached with my last e-mail as patch 1. For your conveniency, I have attached it here again.
With that patch the problem is fixed for me. So please consider applying this, too.
Kind regards, Thomas
Am Sonntag, 13. Januar 2013, 21:04:45 schrieb Rafael J. Wysocki: > On Sunday, January 13, 2013 03:41:34 PM Daniel Lezcano wrote: > > On 01/13/2013 01:34 PM, Thomas Schlichter wrote: > > > Hi, > > > > > > there is a long-standing regression about new C-states not working after > > > disconnecting AC power from a laptop if the cpuidle driver "acpi-idle" > > > is > > > used. It was reported here: > > > > > > [1] https://bugzilla.kernel.org/show_bug.cgi?id=42870 (March 5th 2012) > > > [2] https://bugzilla.kernel.org/show_bug.cgi?id=43349 (June 7th 2012) > > > [3] https://lkml.org/lkml/2012/10/16/518 (October 19th 2012) > > > > > > In [1] Andreas proposed a patch that initialized the missing power_usage > > > values from within acpi_idle in the same way as cpuidle does. > > > In [2] I proposed a patch to use the power values provided by ACPI to > > > initialize the power_usage variables. > > > In [3] Julius proposed a patch to call the initialization function > > > set_power_states() not only once, but always when the C-states change. > > > > > > Currently, Daniel Lezcano seems to be working on an intrusive change of > > > not > > > using the power_usage value at all for choosing a C-state: > > > > > > [4] https://lkml.org/lkml/2012/12/14/155 > > > > > > As I could not find any of these patches in any git trees to be merged > > > for > > > 3.8, I propose an other, least intrusive patch for the time being. It is > > > attached an initializes _all_ power_usage values in the first place. > > > > > > As this is a real power consumption regression since 3.2, I really ask > > > you to apply anything and push it to stable, too! > > > > Rafael, is possible to apply the patch [1/2] I previously sent ? > > > > https://patchwork.kernel.org/patch/1878691/ > > I need to talk about this with Len. That should happen tomorrow if > everything goes well. > > > So we get this bug fixed. > > > > I will resend the patch [2/2] as soon as possible. > > OK > > Thanks, > RafaelFrom fc300f4fefff59fe1029bf7852ea32d957145821 Mon Sep 17 00:00:00 2001 From: Thomas Schlichter <thomas.schlichter@web.de> Date: Sun, 2 Sep 2012 14:35:34 +0200 Subject: [PATCH] Get power info before updating the C-states
acpi_processor_get_power_info() has to be called before acpi_processor_setup_cpuidle_states() to have the latest information available. This fixes the missing C-state information after AC-->DC transition.
Signed-off-by: Thomas Schlichter <thomas.schlichter@web.de> --- drivers/acpi/processor_idle.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index f1a5da4..17ed60b 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1149,6 +1149,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr) } /* Populate Updated C-state information */ + acpi_processor_get_power_info(pr); acpi_processor_setup_cpuidle_states(pr); /* Enable all cpuidle devices */ -- 1.7.10.4
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