3 ms·

Works fine with suspend-to-RAM. FreeBSD doesn't have software suspend-to-disk support (and it's almost never implemented by the BIOS).

yrro 11y ago
Is BIOS support required for hibernation? I don't see why it's necessary; or rather I don't see why the firmware cares whether or not the operating system saved its state to swap before it powered the system off.
- cperciva 11y ago
  When ACPI S4 was first created, there were two versions: "S4OS", and "S4BIOS". In "S4BIOS", the dumping of RAM to disk is handled by the BIOS rather than the OS; this makes the implementation much easier since it means that the OS disk driver can be suspended rather than needing to figure out how to dump itself (and worse, restore itself) to/from disk.
  - yrro 11y ago
    Thanks for that, I had no idea! It sounds like I've been using S4OS with Linux. Do you know what the difference is between S4BIOS and Intel Rapid Start? They sound very similar to me. I'm wondering how the BIOS identifies, when it powers on, that it should resume and where it should read the contents of RAM from.
    - cperciva 11y ago
      Yes, S4BIOS hasn't really been a thing for a long time -- once Windows supported S4OS (and didn't use S4BIOS even if it existed, since they quite reasonably didn't trust BIOS authors to get it right) all the BIOS authors said "this seems like a useless feature" and stopped providing it. No idea about Intel Rapid Start. I don't really deal with that side of the system.
deleted 11y ago
[deleted]
616c 11y ago
> FreeBSD doesn't have software suspend-to-disk support (and it's almost never implemented by the BIOS). Linux has spoied me so bad I never noticed the former, and I am shocked by the latter. Nice to get a response from a completely ignorant BSD and security notice, by the way. :-) I guess I could ego trip and say "how can I trust this user" but I suspect others will chuckle like me.
- cperciva 11y ago
  I'm having trouble understanding this comment. Possibly due to typos?
  - chongli 11y ago
    I think this person is impressed that the founder of Tarsnap would respond to the question of a novice.

yrro 11y ago

Is BIOS support required for hibernation? I don't see why it's necessary; or rather I don't see why the firmware cares whether or not the operating system saved its state to swap before it powered the system off.

cperciva 11y ago
When ACPI S4 was first created, there were two versions: "S4OS", and "S4BIOS". In "S4BIOS", the dumping of RAM to disk is handled by the BIOS rather than the OS; this makes the implementation much easier since it means that the OS disk driver can be suspended rather than needing to figure out how to dump itself (and worse, restore itself) to/from disk.
- yrro 11y ago
  Thanks for that, I had no idea! It sounds like I've been using S4OS with Linux. Do you know what the difference is between S4BIOS and Intel Rapid Start? They sound very similar to me. I'm wondering how the BIOS identifies, when it powers on, that it should resume and where it should read the contents of RAM from.
  - cperciva 11y ago
    Yes, S4BIOS hasn't really been a thing for a long time -- once Windows supported S4OS (and didn't use S4BIOS even if it existed, since they quite reasonably didn't trust BIOS authors to get it right) all the BIOS authors said "this seems like a useless feature" and stopped providing it. No idea about Intel Rapid Start. I don't really deal with that side of the system.

deleted 11y ago

[deleted]

616c 11y ago

> FreeBSD doesn't have software suspend-to-disk support (and it's almost never implemented by the BIOS). Linux has spoied me so bad I never noticed the former, and I am shocked by the latter. Nice to get a response from a completely ignorant BSD and security notice, by the way. :-) I guess I could ego trip and say "how can I trust this user" but I suspect others will chuckle like me.

cperciva 11y ago
I'm having trouble understanding this comment. Possibly due to typos?
- chongli 11y ago
  I think this person is impressed that the founder of Tarsnap would respond to the question of a novice.