Ubuntu
pm-utils package

  1. Bug #336272
  2. Comment #11

Comment 11 for bug 336272

Revision history for this message
Liam O'Reilly (aliam13-2) wrote :

I have quickly investegated my BIOS settings. Under power management there is a field "ACPI Standby State" with options:
-> S1 (POS)
-> S3 (STR)
-> Auto

The option that was selected was S1. With option S3 or Auto selected then the suspend button correctly appears and the system correctly works. With option S1 selected then the suspend button is not displayed.

According to Wikipedia. The state S1 means "All processor caches are flushed, and the CPU(s) stop executing instructions. Power to the CPU(s) and RAM is maintained; devices that do not indicate they must remain on may be powered down". Shouldn't Ubuntu (or Linux in general) support this (less energy saving) version of suspend?