I just found this regarding a patch available in kernels 2.6.24-rc2 and later: http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption#Kernel_boot_and_module_loading_options
The "Useful Patches" section below describes more: Thomas Gleixner High Resolution Timers (hrt) patchset brings many improvements, like the cpuidle work and Udo A. Steinberg and Venki Pallipadi "force enable HPET" patches (non HPET timers causes about 20-40 CPU wakeups/second, but HPET is often hidden by the BIOS due to Windows XP deficiencies). Those are fully merged in 2.6.24-rc1 vanilla kernel. See http://www.tglx.de/projects/hrtimers/ Kristen Carlson Accardi from Intel has a patchset to turn on "Aggressive Link Power Management" (ALPM) for the AHCI driver (for SATA bus). Also from Accardi, SATA Asynchronous Notification (SATA AN), alows SATA link to notify media insertions (thus avoid hal polling the cdrom). Those patches were merged in 2.6.24-rc2 kernel. See: http://www.kernel.org/pub/linux/kernel/people/kristen/patches/SATA/alpm/ The HDAPS disk protection systems can reduce battery life. Matthew Garrett provides a patch that prevents hdaps kernel module to generate interrupts when this feature isn't used. -- poor battery life in gutsy https://bugs.launchpad.net/bugs/153504 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
