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Resume of rtc alarm

How to automatically wake up your computer at a particular time

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How to make RTC Alarm working on my ECS mainboard?

set the wakeup time to 5 minute from now, regardless of whether the rtc is in utc or locatltime. that you can write a new time to the rtc clock alarm (you will need to be root). some computers are unable to wake up from s5 (soft off) by an rtc alarm set through acpi..Chaup - july 2008: works with /proc/acpi/alarm on mythbuntu 8. will cause the rtc alarm to be set, but will not shut the system down.. rtc has to be disabled as well as hpet --zapp 13:27, 18 jan 2009 (utc). you want to change the wakealarm time, you will need to write the new wakealarm time to the rtc. some machines, it may be necessary to enable the rtc interrupt in /proc/acpi/wakeup..22 or later, you may find this information in your kernel log file:$ grep -i rtc /var/log/kern. after a manually initiated boot, 'cat /proc/acpi/alarm' yields '2007-09-00 14:15:00', with '00' for the day..22 and newer use /sys/class/rtc/rtc0/wakealarm - see "using /sys/class/rtc/rtc0/wakealarm", next., your bios time might be in utc rather than local time using:# echo "+00-00-00 00:05:00" > /proc/acpi/alarm. users reported that their bios is only updated after writing 2 times to the alarm file. use of the following command to determine if the relevant wakealarm bios contents are proper. users reported that their bios is only updated after writing 2 times to the alarm file. will need to have a motherboard that supports both acpi and a real time clock alarm functions in the bios. the real time clock (rtc) - most machines (manufactured in 2000 or later) have the ability to use the rtc for time-controlled wakeup - this option is the subject of this howto. must make sure that your rtc is set to utc time - not local time - otherwise it will wakeup at the wrong time. you have set the rtc alarm from linux, it could be that you not see changes in the bios but it still works. some systems will disable the wakealarm after a power outage, but even if it doesn't, if the power is off at the programmed wake time, the wakealarm could be missed. the alarm is set then you should see something like this. simply wrote wake up time to /proc/acpi/alarm, halted, and system wakes up. writing 'echo "2007-09-09 14:15:00" > /proc/acpi/alarm' works perfectly, reading via 'cat /proc/acpi/alarm' yields the expected '2007-09-09 14:15:00', but the system doesn't start at the specified time. many boards, when the rtc setting is enabled in the bios, it will wake only from a time set and saved from bios setup, and not from a time set outside of the bios setup environment - as we want. some cases you need to disable the rtc alarm function is the bios to make things work.

Bios resume by rtsalarm

acpi-alarm script will function with the new sys wakealarm interface or the old acpi/alarm interface. blacklist the rtc module or don't compile it in (the option in under "character drivers" is the one to be excluded). to set wakeup time: date -u -d @$time +%f\ %t > /proc/acpi/alarm. - /sys/class/rtc/rtc0/wakealarm was /proc/acpi/alarm in older ubuntu version. your pc to wakeup using the acpi rtc can be challenging. you need to change the 'resume by rtc' setting - or whatever it's called in your bios - from 'disabled' to 'enabled'., check your bios setup program for the wakeup alarm function. the alarm is set then you should see something like this..Chaup - july 2008: works with /proc/acpi/alarm on mythbuntu 8. to avoid this, it is necessary to disable the writing of the current system time to the rtc by the system shutdown scripts. the real time clock (rtc) - most machines (manufactured in 2000 or later) have the ability to use the rtc for time-controlled wakeup - this option is the subject of this howto. leaving the rtc wakeup alarm on the bios worked with the old interface, you may need to disable it when migrating to the new interface. acpi real time clock alarm function can be used by your mythtv system to wake up your machine at a certain date and time. wake-up function is provided on most modern boards by the ability to "wake from rtc alarm" - setting a date and time in bios will cause the computer to power itself on and boot at the set time. set the wakeup time to 5 minute from now, regardless of whether the rtc is in utc or locatltime. that you can write a new time to the rtc clock alarm (you will need to be root). to save and restore the alarm setting:/etc/init/hwclock-save. the new rtc driver did not think my system could wake from s5 using the rtc..22 or later, you may find this information in your kernel log file:$ grep -i rtc /var/log/kern. - works like a charm on gigabyte ga-ma69gm-s2h using /sys/class/rtc/rtc0/wakealarm on archlinux. if your kernel was built with these enabled your kernel log will contain messages such as rtc_cmos: probe of 00:03 failed with error -16 the solution is to rebuild your kernel with the above two options excluded (find them under drivers -> character devices) and the various rtc interfaces (found under drivers -> real time clock) included.. when you enable “power on by rtc” item, the enable item has more 4 options to setup boot up date & time. you noticed the echo to the acpi-alarm is commented out by default, because it is really better to check first if everything is working correctly (time format the same on your bios and such). wake up from rtc (or lan) is then totally disabled. alarm date (days): it can setup boot up date by monthly.

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Real-time clock alarm - Wikipedia

writing 'echo "2007-09-09 14:15:00" > /proc/acpi/alarm' works perfectly, reading via 'cat /proc/acpi/alarm' yields the expected '2007-09-09 14:15:00', but the system doesn't start at the specified time.: the "cat /proc/driver/rtc" command is a powerful debugging tool, allowing you to see the rtc parameters of interest., your bios time might be in utc rather than local time using:# echo "+00-00-00 00:05:00" > /proc/acpi/alarm. - works like a charm on gigabyte ga-ma69gm-s2h using /sys/class/rtc/rtc0/wakealarm on archlinux..: on some mobo's disabling writing to the rtc will also disable waking up, so it can be just the other way around! this prints out the rtc alarm clock from the bios..24 kernel using /sys/class/rtc/rtc0/wakealarm on an asus m3n-ht deluxe/hdmi. required bios settings - pm wake up events -> irq8:enabled, pcipme:enabled, powerup by alarm:disabled. wake-up function is provided on most modern boards by the ability to "wake from rtc alarm" - setting a date and time in bios will cause the computer to power itself on and boot at the set time. upgraded from mythdora 5 to mythdora 10, which included changing from /proc/acpi/alarm to the new acpi rtc driver. rtc is in local time, however wakealarm must be given a utc time. will need to have a motherboard that supports both acpi and a real time clock alarm functions in the bios. you are interacting with the rtc on your system, you will need to run the prior script with 'sudo' privileges. we can confirm that the alarm is set with the following. - april 2008: works great for pcchips p53g but be sure to only have the rtc-cmos module loaded (not the rtc module -- if rtc module is loaded, unload both rtc and rtc-cmos and then load rtc-cmos again and the device will appear in /sys. if utc is not supported in your environment you will need to recalculate the time before you write it to the rtc. some systems will disable the wakealarm after a power outage, but even if it doesn't, if the power is off at the programmed wake time, the wakealarm could be missed. must make sure that your rtc is set to utc time - not local time - otherwise it will wakeup at the wrong time. to avoid this, it is necessary to disable the writing of the current system time to the rtc by the system shutdown scripts./halt with the following will fix this problem:==> acpitime=`cat /proc/acpi/alarm`. if the wakeup time is on the next year, the rtc timer doesn't seem to respond well. leaving the rtc wakeup alarm on the bios worked with the old interface, you may need to disable it when migrating to the new interface. point of view config_rtc and config_gen_rtc must be unset and, at a minimum, rtc_intf_sysfs must be set. some computers are unable to wake up from s5 (soft off) by an rtc alarm set through acpi. that you have the alarm function in /proc/acpi/alarm.

I would like setup my PC automatically boots up by date & time. How

.: on some mobo's disabling writing to the rtc will also disable waking up, so it can be just the other way around! we can confirm that the alarm is set with the following. you want to change the wakealarm time, you will need to write the new wakealarm time to the rtc. acpi real time clock alarm function can be used by your mythtv system to wake up your machine at a certain date and time., check your bios setup program for the wakeup alarm function. - works fine with my foxconn a74mx usuing /sys/class/rtc/rtc0/wakealarm on ubuntu 8. has the ability to write the date and time of the next recording to the rtc. the new rtc driver did not think my system could wake from s5 using the rtc. the power management menu look for an option that says something like 'schedule start', 'resume by alarm' or 'rtc resume'. in some cases you need to disable the rtc alarm function in the bios to make things work. your pc to wakeup using the acpi rtc can be challenging. simply wrote wake up time to /proc/acpi/alarm, halted, and system wakes up. focus on using one of:Rtc real time clock alarm. required bios settings - pm wake up events -> irq8:enabled, pcipme:enabled, powerup by alarm:disabled. you can't find /sys/class/rtc/rtc0/wakealarm, and you're running a modular kernel, it might be the case that the correct module is not loaded. - works fine with my foxconn a74mx usuing /sys/class/rtc/rtc0/wakealarm on ubuntu 8. of accepting a formatted time, wakealarm accepts the number of seconds since midnight on jan 1, 1970 gmt (this is known as "unix time", "posix time" or "epoch time"). it is important to disable the wakeup on rtc in the bios and editing the /etc/init.: the "cat /proc/driver/rtc" command is a powerful debugging tool, allowing you to see the rtc parameters of interest. it will likely be called something like wake from alarm, power-on by alarm, wake from rtc, rtc resume, etc. `date '+%s' -d '+ 5 minutes'` > /sys/class/rtc/rtc0/wakealarm. bash -c "echo `date '+%s' -d '+ 5 minutes'` > /sys/class/rtc/rtc0/wakealarm". after a manually initiated boot, 'cat /proc/acpi/alarm' yields '2007-09-00 14:15:00', with '00' for the day. will cause the rtc alarm to be set, but will not shut the system down..25 it dos not work; no /sys/class/rtc/rtc0/wakealarm available, only a /proc/driver/rtc .

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    if the wakeup time is on the next year, the rtc timer doesn't seem to respond well. in that case, make sure the rtc module is unloaded, and then load the rtc-cmos module:Manually test wakealarm. script because it appeared to be broken - exec in a script will end the script so the restore of the acpi alarm never gets executed. i use /proc/acpi/alarm interface and the patch to hwclock. did not change bios rtc wakeup setting from default of 'disable'. wake up from rtc (or lan) is then totally disabled. reason for this recommendation is that most linux distributions write the current system time back to the rtc when shutting down the machine.. rtc has to be disabled as well as hpet --zapp 13:27, 18 jan 2009 (utc)..22 and higher may be configured to use the legacy /proc/acpi/alarm instead of the new rtc wakealarm. this prints out the rtc alarm clock from the bios. - works fine on a asrock k7vt2 using /sys/class/rtc/rtc0/wakealarm on mythbuntu kernel 2. has the ability to write the date and time of the next recording to the rtc. of accepting a formatted time, wakealarm accepts the number of seconds since midnight on jan 1, 1970 gmt (this is known as "unix time", "posix time" or "epoch time")..24 kernel using /sys/class/rtc/rtc0/wakealarm on an asus m3n-ht deluxe/hdmi. script because it appeared to be broken - exec in a script will end the script so the restore of the acpi alarm never gets executed. the following tips are for /proc/acpi/alarm and older systems. in some cases you need to disable the rtc alarm function in the bios to make things work. many boards, when the rtc setting is enabled in the bios, it will wake only from a time set and saved from bios setup, and not from a time set outside of the bios setup environment - as we want. it is important to disable the wakeup on rtc in the bios and editing the /etc/init. point of view config_rtc and config_gen_rtc must be unset and, at a minimum, rtc_intf_sysfs must be set. making complex scripts, do a simple test to ensure that a wakeup time can be written to the bios and that the computer correctly wakes up based on this time:The commands set the wakeup time to 5 minute from now, regardless of whether the rtc is in utc or locatltime and then turns off the machine. you can tell if the system thinks it needs to wake up by looking at /proc/driver/rtc - if 'alarm_irq' is "yes" then the system should wake up as scheduled. possible glitch is, that the option "resume by alarm" (or whatever it is called) is set to enabled but wake up using /proc/acpi/alarm only works if the option is set to disabled. use of the following command to determine if the relevant wakealarm bios contents are proper. linux, the real time clock alarm can be set or retrieved using /proc/acpi/alarm or /sys/class/rtc/rtc0/wakealarm.

    AN-PM-007 Suspend and Resume

    you see the alarm date similar to ****-12-21 then the alarm is set to a time in the past and it won't wake up. to save and restore the alarm setting:/etc/init/hwclock-save. `date '+%s' -d '+ 5 minutes'` > /sys/class/rtc/rtc0/wakealarm. the following tips are for /proc/acpi/alarm and older systems. for example some hp compaq desktop computers allow you to set wakeup from bios at a specific time and at specific week days, however it is ignored acpi alarm./halt with the following will fix this problem:==> acpitime=`cat /proc/acpi/alarm`. with most rtcs, the machine will not wake up if the hardware clock has been modified after the wakeup alarm has been set. - april 2008: works great for pcchips p53g but be sure to only have the rtc-cmos module loaded (not the rtc module -- if rtc module is loaded, unload both rtc and rtc-cmos and then load rtc-cmos again and the device will appear in /sys. you have set the rtc alarm from linux, it could be that you not see changes in the bios but it still works. rtc wakeup just works, some tricks required for suspend to ram - see user:lwoggardner#suspend_to_ram_on_idle for details.. rtcwake works well after handling the saa7164 module used by the hauppauge wintv-hvr-22xx family of devices. that you have the alarm function in /proc/acpi/alarm..27 and possibly others) and on some hardware, wikipedia:hpet seems to conflict with acpi wakeup capabilities: calls to /sys/class/rtc/rtc0/wakealarm seem to behave normally but computer won't wake up. you see the alarm date similar to ****-12-21 then the alarm is set to a time in the past and it won't wake up. after much pain, i built my own kernel with the legacy /proc/acpi/alarm, and now i am happy again. steps for using the rtc to access the acpi alarm function. after you have set the rtc alarm from linux, you might not see the changes in the bios, but it still works. in that case, make sure the rtc module is unloaded, and then load the rtc-cmos module:Manually test wakealarm..22 and newer use /sys/class/rtc/rtc0/wakealarm - see "using /sys/class/rtc/rtc0/wakealarm", next..22 and higher may be configured to use the legacy /proc/acpi/alarm instead of the new rtc wakealarm. disabled rtc bios settings (they don't seem to be useful unless you want to wakeup your pc on a particular hardcoded time). did not change bios rtc wakeup setting from default of 'disable'. powering up after a power outage allows mythtv to reset the wakealarm so that future recordings are not missed. however, newer bios setups do not include an rtc alarm option, although it can still be set from within user applications. possible glitch is, that the option "resume by alarm" (or whatever it is called) is set to enabled but wake up using /proc/acpi/alarm only works if the option is set to disabled.
    • ACPI Wakeup - MythTV Official Wiki

      i use /proc/acpi/alarm interface and the patch to hwclock. focus on using one of:Rtc real time clock alarm., check the troubleshooting /sys/class/rtc/rtc0/wakealarm section above. making complex scripts, do a simple test to ensure that a wakeup time can be written to the bios and that the computer correctly wakes up based on this time:The commands set the wakeup time to 5 minute from now, regardless of whether the rtc is in utc or locatltime and then turns off the machine. some machines, it may be necessary to enable the rtc interrupt in /proc/acpi/wakeup..24 configured the kernel as required above but used time_t as the wakeup time format (time since epoch) which seems to work when echoed straight to /sys/class/rtc/rtc0/wakealarm. you noticed the echo to the acpi-alarm is commented out by default, because it is really better to check first if everything is working correctly (time format the same on your bios and such). disabled rtc bios settings (they don't seem to be useful unless you want to wakeup your pc on a particular hardcoded time). if, instead, you shut the system down, the mythtv backend is not able to update the bios with the correct wakealarm time. if utc is not supported in your environment you will need to recalculate the time before you write it to the rtc. if so then shut down and see if it wakes up at the alarm date/time..21 and older use /proc/acpi/alarm - see "archive: using /proc/acpi/alarm" below. following example will set the wakeup time to 5 minute from now, regardless of whether the rtc is in utc or locatltime. if, instead, you shut the system down, the mythtv backend is not able to update the bios with the correct wakealarm time..27 and possibly others) and on some hardware, wikipedia:hpet seems to conflict with acpi wakeup capabilities: calls to /sys/class/rtc/rtc0/wakealarm seem to behave normally but computer won't wake up. for example some hp compaq desktop computers allow you to set wakeup from bios at a specific time and at specific week days, however it is ignored acpi alarm. with most rtcs, the machine will not wake up if the hardware clock has been modified after the wakeup alarm has been set. - /sys/class/rtc/rtc0/wakealarm was /proc/acpi/alarm in older ubuntu version. some cases you need to disable the rtc alarm function is the bios to make things work..24 configured the kernel as required above but used time_t as the wakeup time format (time since epoch) which seems to work when echoed straight to /sys/class/rtc/rtc0/wakealarm. bash -c "echo `date '+%s' -d '+ 5 minutes'` > /sys/class/rtc/rtc0/wakealarm"., check the troubleshooting /sys/class/rtc/rtc0/wakealarm section above. it will likely be called something like wake from rtc, wake from alarm, rtc resume, etc. it will likely be called something like wake from rtc, wake from alarm, rtc resume, etc. powering up after a power outage allows mythtv to reset the wakealarm so that future recordings are not missed.
    • Never wait for your computer to start again - BT

      rtc is in local time, however wakealarm must be given a utc time. steps for using the rtc to access the acpi alarm function. upgraded from mythdora 5 to mythdora 10, which included changing from /proc/acpi/alarm to the new acpi rtc driver..25 it dos not work; no /sys/class/rtc/rtc0/wakealarm available, only a /proc/driver/rtc .: the wakealarm interface is incompatible with the kernel's old "enhanced real time clock support" and "generic /dev/rtc emulation" options.. please select “power on by rtc” item and the item default is “disabled”. it will likely be called something like wake from alarm, power-on by alarm, wake from rtc, rtc resume, etc. this is because the mythtv shutdown sequence writes the wakealarm time to the bios just before shutting down the system. if your kernel was built with these enabled your kernel log will contain messages such as rtc_cmos: probe of 00:03 failed with error -16 the solution is to rebuild your kernel with the above two options excluded (find them under drivers -> character devices) and the various rtc interfaces (found under drivers -> real time clock) included. acpi-alarm script will function with the new sys wakealarm interface or the old acpi/alarm interface. real time clock alarm is a feature that can be used to allow a computer to 'wake up' after shut down to execute tasks every day or on a certain day. after you have set the rtc alarm from linux, you might not see the changes in the bios, but it still works. rtc wakeup just works, some tricks required for suspend to ram - see user:lwoggardner#suspend_to_ram_on_idle for details.[1] alternatively the rtcwake utility may be used which prevents problems when using local time instead of utc by automatically processing the /etc/adjtime file. you can tell if the system thinks it needs to wake up by looking at /proc/driver/rtc - if 'alarm_irq' is "yes" then the system should wake up as scheduled. to set wakeup time: date -u -d @$time +%f\ %t > /proc/acpi/alarm.: the wakealarm interface is incompatible with the kernel's old "enhanced real time clock support" and "generic /dev/rtc emulation" options. following example will set the wakeup time to 5 minute from now, regardless of whether the rtc is in utc or locatltime.. please change to “enable” of power on by rtc item.. rtcwake works well after handling the saa7164 module used by the hauppauge wintv-hvr-22xx family of devices. this is because the mythtv shutdown sequence writes the wakealarm time to the bios just before shutting down the system. you are interacting with the rtc on your system, you will need to run the prior script with 'sudo' privileges. if so then shut down and see if it wakes up at the alarm date/time. blacklist the rtc module or don't compile it in (the option in under "character drivers" is the one to be excluded). reason for this recommendation is that most linux distributions write the current system time back to the rtc when shutting down the machine.
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