This is a note to let you know that I've just added the patch titled
ACPI / PM: Do not execute _PS0 for devices without _PSC during
initialization
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-pm-do-not-execute-_ps0-for-devices-without-_psc-during-initialization.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 7cd8407d53ef5fb0280fcbe34f42311472f90feb Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <[email protected]>
Date: Wed, 5 Jun 2013 14:01:19 +0200
Subject: ACPI / PM: Do not execute _PS0 for devices without _PSC during
initialization
From: "Rafael J. Wysocki" <[email protected]>
commit 7cd8407d53ef5fb0280fcbe34f42311472f90feb upstream.
Commit b378549 (ACPI / PM: Do not power manage devices in unknown
initial states) added code to force devices without _PSC, but having
_PS0 defined in the ACPI namespace, into ACPI power state D0 by
executing _PS0 for them. That turned out to break Toshiba P870-303,
however, so revert that code.
References: https://bugzilla.kernel.org/show_bug.cgi?id=58201
Reported-and-tested-by: Jerome Cantenot <[email protected]>
Tracked-down-by: Lan Tianyu <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/device_pm.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -269,11 +269,13 @@ int acpi_bus_init_power(struct acpi_devi
if (result)
return result;
} else if (state == ACPI_STATE_UNKNOWN) {
- /* No power resources and missing _PSC? Try to force D0. */
+ /*
+ * No power resources and missing _PSC? Cross fingers and make
+ * it D0 in hope that this is what the BIOS put the device into.
+ * [We tried to force D0 here by executing _PS0, but that broke
+ * Toshiba P870-303 in a nasty way.]
+ */
state = ACPI_STATE_D0;
- result = acpi_dev_pm_explicit_set(device, state);
- if (result)
- return result;
}
device->power.state = state;
return 0;
Patches currently in stable-queue which might be from
[email protected] are
queue-3.9/acpi-video-ignore-bios-initial-backlight-value-for-hp-m4.patch
queue-3.9/acpi-video-ignore-bios-initial-backlight-value-for-hp-pavilion-g6.patch
queue-3.9/acpi-cpufreq-set-current-frequency-based-on-target-p-state.patch
queue-3.9/acpi-scan-do-not-match-drivers-against-objects-having-scan-handlers.patch
queue-3.9/x86-platform-hp_wmi-fix-bluetooth_rfkill-misuse-in-hp_wmi_rfkill_setup.patch
queue-3.9/acpi-pm-do-not-execute-_ps0-for-devices-without-_psc-during-initialization.patch
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