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Old 07-11-2012, 03:24 PM
Colin King
Default ACPI / PM: Make acpi_pm_device_sleep_state() follow the specification

From: Colin Ian King <colin.king@canonical.com>

BugLink: http://bugs.launchpad.net/bugs/904261

== SRU Justification ==

A class of new machines from Lenovo (such as the U300) and some ASUS laptops
are hanging on suspend.

== Fix ==

This patch is already an upstream fix that makes
acpi_pm_device_sleep_state() conform to the ACPI specification.

== Impact ==

Machines like Lenovo U300 and some ASUS laptops fail to suspend. The only
viable workaround is xHCI bind/unbind hack which is really ugly and can
potentially lose data with connected devices.

== Test Case ==

Simply suspend the laptop, without the fix it will just hang on suspend.

This has been tested on a Lenovo U300 and also sanity checked on a
Lenovo X220i (which didn't have the bug) to check it doesn't cause problems
on hardware without this bug.

Rafael J. Wysocki (1):
ACPI / PM: Make acpi_pm_device_sleep_state() follow the specification

drivers/acpi/sleep.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)


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