** Description changed: SRU Justification: 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) and were even - suggested as a stable release by the upstream maintainer. + patches are already upstream as well (see details below). I'd originally pursued providing this update via linux-bcakports- modules. However, testing proved that because the acpi_idle driver is built into the kernel, it prevents the intel_idle driver from loading later on via LBM. This is because the core cpuidle driver is not capable of handling run-time changing of idle drivers. + I would also like to note that these patches were originally submitted to upstream stable by the upstream maintainer. However, the submission + was later retracted due to the fact that some of the patches are cosmetic in nature. See: + + git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux- + idle-2.6.35.y.git idle-release + Impact: - These patches should only affect the intel_idle driver. It will also only load on supported systems. 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". + + These patches should only affect the intel_idle driver. It will also + only load on supported systems. 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". I will also update https://wiki.ubuntu.com/Kernel/Dev/KernelDriverDeviations to note the update. - Test Case: Load the kernel with the updated intel_idle driver on a - system which is supported and confirm it loads and is functioning. + Test Case: + + Load the kernel with the updated intel_idle driver on a system which is + supported and confirm it loads/functions. A summary of the usptream patches is as follows: - git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux- - idle-2.6.35.y.git idle-release - - * 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 - * cpuidle: extend cpuidle and menu governor to handle dynamic states - * intel_idle: add missing __percpu markup - * intel_idle: Change mode 755 => 644 - * x86, mwait: Move mwait constants to a common header file - * 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 + * 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 + * cpuidle: extend cpuidle and menu governor to handle dynamic states + * intel_idle: add missing __percpu markup + * intel_idle: Change mode 755 => 644 + * x86, mwait: Move mwait constants to a common header file + * 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
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/684888 Title: Update intel_idle driver -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
