Difference between revisions of "System wakeup"

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(Overview of ACPI and nvram wakeup)
 
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[[Category:Power Management]]
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.
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{{Tip box|Most newer machines (year 2000 and later) should work correctly with "ACPI Wakeup" below and it is recommended that you try this method first.}}
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==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, 2.6.21 and earlier).
 
{{Wikipage|ACPI_Wakeup|ACPI Wakeup}}
 
{{Wikipage|ACPI_Wakeup|ACPI Wakeup}}
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==Wake-on-LAN Wakeup==
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This uses the network card to listen for a "magic packet" that is sent when it is time to wake up.
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{{Wikipage|Wake-on-LAN|Wake-on-LAN}}
 
==nvram-wakeup==
 
==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.
 
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|http://sourceforge.net/projects/nvram-wakeup|http://sourceforge.net/projects/nvram-wakeup}}
 
 
{{Wikipage|Shutdown_Wakeup|Shutdown Wakeup}}
 
{{Wikipage|Shutdown_Wakeup|Shutdown Wakeup}}
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{{Webpage|sourceforge.net/projects/nvram-wakeup|http://sourceforge.net/projects/nvram-wakeup}}

Latest revision as of 18:57, 9 April 2014


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" below 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, 2.6.21 and earlier).

Wikipage.png - ACPI Wakeup mythTV wiki page

Wake-on-LAN Wakeup

This uses the network card to listen for a "magic packet" that is sent when it is time to wake up.

Wikipage.png - Wake-on-LAN 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.

Wikipage.png - Shutdown Wakeup mythTV wiki page

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