Public bug reported:
SRU Justification:
As part of the linux-backports-modules package, we periodically provide
updated drivers to provide additional support for hardware and provide
bug fixes. The intel_idle is a cpuidle driver that loads on specific
Intel processors in lieu of the legacy ACPI processor_idle driver. The
intent is to make Linux more efficient on these processors, as
intel_idle knows more than ACPI, as well as make Linux more immune to
ACPI BIOS bugs. As we now support HW that can leverage the intel_idle
driver, it's advantageous to provide an updated version of the driver
for those interested in it's use. All of the patches are already
upstream as well (see details below).
Impact:
linux-backports-modules is an elective install so the risk of regression should
be small. Additionally, and these patches only touches a specific driver.
This driver can also be disabled by booting with "intel_idle.max_cstate=0"
which disables intel_idle and the system will fall back on ACPI's "acpi_idle".
Test Case: Install the linux-backports-modules-idle package.
A summary of the usptream patches is as follows:
* intel_idle: do not use the LAPIC timer for ATOM C2
* intel_idle: add initial Sandy Bridge support
* intel_idle: delete bogus data from cpuidle_state.power_usage
* intel_idle: simplify test for leave_mm()
* intel_idle: enable Atom C6
* intel_idle: Voluntary leave_mm before entering deeper
* intel_idle: add missing __percpu markup
* intel_idle: Change mode 755 => 644
* intel_idle: recognize Lincroft Atom Processor
* intel_idle: add support for Westmere-EX
* intel_idle: delete power_policy modparam, and choose substate functions
* intel_idle: delete substates DEBUG modparam
** Affects: linux-backports-modules-2.6.35 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-backports-modules-2.6.35 (Ubuntu Maverick)
Importance: Medium
Assignee: Leann Ogasawara (leannogasawara)
Status: In Progress
** Affects: linux-meta (Ubuntu Maverick)
Importance: Medium
Assignee: Leann Ogasawara (leannogasawara)
Status: In Progress
** Also affects: linux-backports-modules-2.6.35 (Ubuntu Maverick)
Importance: Undecided
Status: New
** Also affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-meta (Ubuntu)
Status: New => Invalid
** Changed in: linux-backports-modules-2.6.35 (Ubuntu)
Status: New => Invalid
** Changed in: linux-backports-modules-2.6.35 (Ubuntu Maverick)
Importance: Undecided => Medium
** Changed in: linux-backports-modules-2.6.35 (Ubuntu Maverick)
Status: New => Triaged
** Changed in: linux-backports-modules-2.6.35 (Ubuntu Maverick)
Assignee: (unassigned) => Leann Ogasawara (leannogasawara)
** Changed in: linux-backports-modules-2.6.35 (Ubuntu Maverick)
Status: Triaged => In Progress
** Changed in: linux-meta (Ubuntu Maverick)
Importance: Undecided => Medium
** Changed in: linux-meta (Ubuntu Maverick)
Status: New => In Progress
** Changed in: linux-meta (Ubuntu Maverick)
Assignee: (unassigned) => Leann Ogasawara (leannogasawara)
--
Add updated intel_idle driver
https://bugs.launchpad.net/bugs/680329
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