Re: Wake-on-timer rtcwake experiments on various PC hardware

Mon, Apr 17, 2023 at 09:14:30PM +0300, Marko M=E4kel=E4 wrote:
>The "rtcwake -m show" straight after the reboot indicated that the =

>alarm is off. I read all journal entries between the two rtcwake =

>commands, which were helpfully logged. The only thing I found was a =

>kernel boot message that said that the RTC device supports wakeup from =

>the ACPI S4 state (hibernate, suspend-to-disk). The normal "soft power =

>off" would be S5. So, I will have to shrink the file system and create =

>a swap partition, to enable the suspend-to-disk. I expect that after =

>this exercise, "rtcwake -m disk -s 300" should actually work, perhaps =

>even without using any "powertop" spells.

After I shrunk the only partition and created a swap partition, I got =

"rtcwake -m disk -s 300" to wake up the computer, with no need for any =

tuning with "powertop". After I fixed the resume settings and rebuilt =

the initial RAM disk, the computer would correctly wake up from the =

hibernation, and the exit status of the rtcwake would be 0, as expected.  =

Before I fixed that, the computer powered up, but ran a normal boot =

sequence, including a file system check.

I am going to create a page =

https://www.linuxtv.org/vdrwiki/index.php/Rtcwake for documenting this.  =

For commodity x86 or x86-64 hardware, rtcwake seems to actually work, =

with some quirks.

Assuming that the environment has been set up correctly for rtcwake, I =

believe that my VDR shutdown script in =

https://www.linuxtv.org/vdrwiki/index.php/Systemd should work as is. I =

did not test it yet.

	Marko

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