Difference between revisions of "System wakeup"

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(nvram-wakeup)
(Added specifics regarding age of motherboards and kernel versions.)
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[[Category:Wakeup]]
 
[[Category:Wakeup]]
  
The BIOS on your computer’s motherboard will typically allow you to wake up your computer without additional hardware. More or less any modern machine should have a function for time-controlled booting.
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The BIOS on your computer’s motherboard will typically allow you to wake up your computer without additional hardware. Almost every modern machine should have a function for time-controlled booting.
 
There are two methods that can be used with MythTV to wakeup your computer.
 
There are two methods that can be used with MythTV to wakeup your computer.
{{Tip box|Most newer machines should work correctly with ACPI Wakeup and you should probably try that method first.}}
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{{Tip box|Most newer machines (year 2000 and later) should work correctly with "ACPI Wakeup" and it is recommended that you try this method first.}}
  
 
==ACPI Wakeup==
 
==ACPI Wakeup==
This uses the system's ACPI subsystem and requires the presence of /proc/acpi/alarm or /sys/class/rtc/rtc0/wakealarm.
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This uses the system's ACPI subsystem and requires the presence of /sys/class/rtc/rtc0/wakealarm (current kernels, 2.6.22 and later) or /proc/acpi/alarm (older kernels, before 2.6.22).
 
{{Wikipage|ACPI_Wakeup|ACPI Wakeup}}
 
{{Wikipage|ACPI_Wakeup|ACPI Wakeup}}
 
==nvram-wakeup==
 
==nvram-wakeup==

Revision as of 23:33, 14 November 2009


The BIOS on your computer’s motherboard will typically allow you to wake up your computer without additional hardware. Almost every modern machine should have a function for time-controlled booting. There are two methods that can be used with MythTV to wakeup your computer.

Information.png Tip: Most newer machines (year 2000 and later) should work correctly with "ACPI Wakeup" and it is recommended that you try this method first.

ACPI Wakeup

This uses the system's ACPI subsystem and requires the presence of /sys/class/rtc/rtc0/wakealarm (current kernels, 2.6.22 and later) or /proc/acpi/alarm (older kernels, before 2.6.22).

Wikipage.png - ACPI Wakeup mythTV wiki page

nvram-wakeup

This is a small program that reads and writes the WakeUp time in the BIOS. This is done via /dev/nvram on recent kernels (>2.4.6, including 2.6.x) or, alternatively, via direct ISA access. On this WakeUp time the computer is powered on automatically.

Webpage.png - http://sourceforge.net/projects/nvram-wakeup

Wikipage.png - Shutdown Wakeup mythTV wiki page