Ubuntu
linux package

  1. Bug #904261
  2. Comment #39

Comment 39 for bug 904261

Revision history for this message
Colin Ian King (colin-king) wrote :

== 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.