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#Does ibm thinkpad r51 support wakeonlan how to#
#Does ibm thinkpad r51 support wakeonlan windows#

HPET is often hidden by the BIOS due to Windows XP deficiencies). Steinberg and Venki Pallipadi "forceĮnable HPET" patches (non HPET timers causes about 20-40 CPU wakeups/second, but Thomas Gleixner High Resolution Timers (hrt) patchset brings many improvements, Please add your ThinkPad to the above list, if hpet=force was required Useful Patches If this does not display "Clock Event Device: hpet", then add lspci output), as in most modern Thinkpads, you shouldīe using the integrated HPET timer (saves about 30 CPU wake ups per second). If you have an Intel chipset ICH5 or later (cf.

#Does ibm thinkpad r51 support wakeonlan how to#

How to make use of Power Management features.Those options are already in Fedora Core 7 and Ubuntu Gutsy (not Feisty) default i686 kernels.Īlso, you need to properly set APM and ACPI. Reduce power consumption or to help diagnosing consumers:ĬONFIG_X86_SPEEDSTEP_CENTRINO depreciated as of kernel 2.6.24, use CONFIG_X86_ACPI_CPUFREQ Here are a few options (beside the ACPI and APM related one) that matter to You may think about compiling a recent kernel yourself. If it's not already on your distribution and you value power efficiency,

Later, 2.6.24-rc2 brought a lot of other power efficiency improvements. The 2.6.21 kernel brought some very effective changes (like dynticks). Kernel settings and patches General settings With the help of in kernel CPU governors.įrom Intel's kernel developer Arjan van de Ven. The best is to let the kernel select the appropriates CPU frequencies by itself The CPU freq, and returned back faster to a deeper, economic, C-state and to a There is something to do, while it could have done this work faster by augmenting This willĬause the CPU to stay longer in C0 (power hungry C-state) doing hard work when Stay really idle when they meant to be idle (track shorts select timeoutsĪlso note that manually locking the CPU in the lowest P-state (frequency)Īvailable is not an efficient way to improve battery lifetime. Therefore you should ensure your applications Pentium M undervolting and underclockingĪ good thing to keep in mind is that every CPU wakeup, even if it's forĪ trivial light job, reduce the time the CPU stays on a deep power.

How to make use of Dynamic Frequency Scaling.

Disabling these devices can reduce power consumption by several watts. Although this requires a reboot to change settings, using the BIOS rather than a configuration file will survive distribution changes and may make it easier to remember how to re-enable a port. The BIOS (at least version 3.11 on X200) can also be used to disable I/O ports, like PCMCIA/CardBus. You should indeed enable them, else the deepest C3 and C4 ACPI C-states PCI bus power management: (default disabled) With a very misleading online help (saying "Usually not needed"). Some Thinkpad BIOS (like 2.08 BIOS on X40) offer two very lame options, Other useful tools for this purpose are blktrace, iostat and lm-profiler Will list all applications causing disks wakeups on the kernel's dmesg. PowerTOP users collected some tips & tricksĪlternatively (or complementary) to PowerTOP, running strace -p $(pidof yourapp)įor all your favorite or background running applications while they are expected to beīeside CPU wakeups, disks spins are also power hungry. The top power offenders, both userland and kernel modules, which prevent the use of CPU power saving mechanisms and sometime suggest Is a gold mine to improve energy efficiency, but is almost only CPU-oriented.

4.2 Kernel boot and module loading options.