Re: Programmed wakeup from suspend/hibernate
On Thu, Dec 24, 2020 at 08:16:12AM -0800, Bryan Linton wrote: > On 2020-12-24 10:31:22, Ian Darwin wrote: > > On Thu, Dec 24, 2020 at 11:51:26AM +0100, Gabriel Hondet wrote: > > > Hi, > > > > > > How can I program my computer to automatically wake from suspend to ram > > > or suspend to disk at a certain time? > > > > > > My goal is to suspend a server every day from, say, 11 pm to 7am. > > > > For suspending at night, use see the cron man page. > > > > For waking up in the morning, of course, the OS isn't running so there is > > nothing > > it can do. In fact I was hoping that it can, since for instance it can be woken up by pressing a key (although I don't know anything about the mechanics involved). For this I thought the line acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP2(S4) XHCI(S3) EHC1(S3) of dmesg could help. It seems, if I'm not mistaken, that Linux supports such a thing using rtcwake. > > Some but not all PC BIOSes have a scheduling feature. Ah that's interesting thank you. > > Otherwise a > > $10 mechanical timer to cut the power (well after the suspend is finished!) > > and > > turn it back on in the morning. > > > > If shutting down the server entirely (instead of suspending it) > were an option, you could schedule a cron job to shut it down at a > given time and send a WoL (Wake on LAN) packet from another > computer on the network to wake it up again. > > Oh, I just skimmed the ifconfig manpage and found the following: > > wol Enable Wake on LAN (WoL). When enabled, reception of a > WoL frame will cause the network card to power up the > system from standby or suspend mode. WoL frames are sent > using arp(8). > > So it looks like you could even do this while the system were > suspended if your network card supports it. Of course, this > depends on having another server on the same, physical LAN as the > server in question, so the mechanical switch suggestion above might be > the only option if that's not the case. That's a good idea as well, thank you.
Re: Programmed wakeup from suspend/hibernate
On 2020-12-24, Gabriel Hondet wrote: > On Thu, Dec 24, 2020 at 08:16:12AM -0800, Bryan Linton wrote: >> On 2020-12-24 10:31:22, Ian Darwin wrote: >> > On Thu, Dec 24, 2020 at 11:51:26AM +0100, Gabriel Hondet wrote: >> > > Hi, >> > > >> > > How can I program my computer to automatically wake from suspend to ram >> > > or suspend to disk at a certain time? >> > > >> > > My goal is to suspend a server every day from, say, 11 pm to 7am. >> > >> > For suspending at night, use see the cron man page. >> > >> > For waking up in the morning, of course, the OS isn't running so there is >> > nothing >> > it can do. > In fact I was hoping that it can, since for instance it can be woken up > by pressing a key (although I don't know anything about the mechanics > involved). For this I thought the line > > acpi0: wakeup devices LID_(S4) SLPB(S3) IGBE(S4) EXP2(S4) XHCI(S3) > EHC1(S3) > > of dmesg could help. It seems, if I'm not mistaken, that Linux supports > such a thing using rtcwake. It does, at least on some machines. Nobody has implemented an equivalent for OpenBSD yet afaik. There are various complications, https://www.mythtv.org/wiki/ACPI_Wakeup talks about it a bit. >> > Some but not all PC BIOSes have a scheduling feature. > Ah that's interesting thank you. Yes, this is probably simplest if available. >> > Otherwise a >> > $10 mechanical timer to cut the power (well after the suspend is >> > finished!) and >> > turn it back on in the morning. >> > >> >> If shutting down the server entirely (instead of suspending it) >> were an option, you could schedule a cron job to shut it down at a >> given time and send a WoL (Wake on LAN) packet from another >> computer on the network to wake it up again. >> >> Oh, I just skimmed the ifconfig manpage and found the following: >> >> wol Enable Wake on LAN (WoL). When enabled, reception of a >> WoL frame will cause the network card to power up the >> system from standby or suspend mode. WoL frames are sent >> using arp(8). >> >> So it looks like you could even do this while the system were >> suspended if your network card supports it. Of course, this >> depends on having another server on the same, physical LAN as the >> server in question, so the mechanical switch suggestion above might be >> the only option if that's not the case. > That's a good idea as well, thank you. It is particularly widely supported in NIC drivers on OpenBSD. The following can do wol: re xl jme nfe vr rge. In particular it's not supported with any of the intel NIC drivers.
Re: Programmed wakeup from suspend/hibernate
Ian Darwin wrote: I think you forgot to cc misc@, so the OP won't see your reply. On Thu, Dec 24, 2020 at 10:34:19AM -0500, Daniel Wilkins wrote: Ian Darwin wrote: Otherwise a $10 mechanical timer to cut the power (well after the suspend is finished!) and turn it back on in the morning. You'd want to make sure to *hibernate* for that rather than suspend. Almost all motherboards have wake-on-lan these days. You could get a tiny board that consumes no power whose only job is to send a WoL packet to the server for real suspend if that's viable. I did; my bad. Fixing now.
Re: Programmed wakeup from suspend/hibernate
On 2020-12-24 10:31:22, Ian Darwin wrote: > On Thu, Dec 24, 2020 at 11:51:26AM +0100, Gabriel Hondet wrote: > > Hi, > > > > How can I program my computer to automatically wake from suspend to ram > > or suspend to disk at a certain time? > > > > My goal is to suspend a server every day from, say, 11 pm to 7am. > > For suspending at night, use see the cron man page. > > For waking up in the morning, of course, the OS isn't running so there is > nothing > it can do. Some but not all PC BIOSes have a scheduling feature. Otherwise a > $10 mechanical timer to cut the power (well after the suspend is finished!) > and > turn it back on in the morning. > If shutting down the server entirely (instead of suspending it) were an option, you could schedule a cron job to shut it down at a given time and send a WoL (Wake on LAN) packet from another computer on the network to wake it up again. Oh, I just skimmed the ifconfig manpage and found the following: wol Enable Wake on LAN (WoL). When enabled, reception of a WoL frame will cause the network card to power up the system from standby or suspend mode. WoL frames are sent using arp(8). So it looks like you could even do this while the system were suspended if your network card supports it. Of course, this depends on having another server on the same, physical LAN as the server in question, so the mechanical switch suggestion above might be the only option if that's not the case. -- Bryan
Programmed wakeup from suspend/hibernate
Hi, How can I program my computer to automatically wake from suspend to ram or suspend to disk at a certain time? My goal is to suspend a server every day from, say, 11 pm to 7am. Best regards, Gabriel
Re: Programmed wakeup from suspend/hibernate
On Thu, Dec 24, 2020 at 11:51:26AM +0100, Gabriel Hondet wrote: > Hi, > > How can I program my computer to automatically wake from suspend to ram > or suspend to disk at a certain time? > > My goal is to suspend a server every day from, say, 11 pm to 7am. For suspending at night, use see the cron man page. For waking up in the morning, of course, the OS isn't running so there is nothing it can do. Some but not all PC BIOSes have a scheduling feature. Otherwise a $10 mechanical timer to cut the power (well after the suspend is finished!) and turn it back on in the morning.
