I am new to CentOS, but do have some experience with other linux variants like OpenWRT or Bananian and I also do have a Windows server that I want to replace with a Linux based system. Thus I installed a CentOS (minimal) server (with encrypted partitions if that matters, need to fiddle with how to provide the keys reasonably) on a Dell T20. As the server is not used 24*7 I would like to install a simple monitor and when no activity is detected suspend-to-ram, from where I can then WOL the system again. WOL is already working, however the suspend-to-ram does not work as expected: the disk spins down (saving ca. 5W), network is inactive (WOL works, but a ssh session does not work), but the power led does not flash as other systems do and the power meter shows 45W - not exactly what I expected.
Dmesg shows something like this:
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[ 1682.283665] PM: Syncing filesystems ... done.
[ 1682.288218] Freezing user space processes ... (elapsed 0.001 seconds) done.
[ 1682.289376] Freezing remaining freezable tasks ... (elapsed 0.000 seconds) done.
[ 1682.290045] Suspending console(s) (use no_console_suspend to debug)
[ 1682.290301] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
[ 1682.290349] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[ 1682.290380] sd 1:0:0:0: [sdb] Stopping disk
[ 1682.290566] sd 0:0:0:0: [sda] Stopping disk
[ 1682.499311] e1000e: EEE TX LPI TIMER: 00000011
[ 1682.850513] PM: suspend of devices complete after 559.857 msecs
[ 1682.873589] PM: late suspend of devices complete after 23.052 msecs
[ 1682.873897] ehci-pci 0000:00:1d.0: System wakeup enabled by ACPI
[ 1682.875481] ehci-pci 0000:00:1a.0: System wakeup enabled by ACPI
[ 1682.876480] e1000e 0000:00:19.0: System wakeup enabled by ACPI
[ 1682.888488] xhci_hcd 0000:00:14.0: System wakeup enabled by ACPI
[ 1682.892537] PM: noirq suspend of devices complete after 18.930 msecs
[ 1706.955963] xhci_hcd 0000:00:14.0: System wakeup disabled by ACPI
[ 1706.969950] ehci-pci 0000:00:1a.0: System wakeup disabled by ACPI
[ 1706.971952] ehci-pci 0000:00:1d.0: System wakeup disabled by ACPI
[ 1706.973174] PM: noirq resume of devices complete after 32.248 msecs
[ 1706.977822] PM: early resume of devices complete after 4.611 msecs
[ 1706.977949] mei_me 0000:00:16.0: irq 29 for MSI/MSI-X
[ 1706.977985] e1000e 0000:00:19.0: System wakeup disabled by ACPI
[ 1706.978058] snd_hda_intel 0000:00:1b.0: irq 32 for MSI/MSI-X
[ 1706.979329] sd 0:0:0:0: [sda] Starting disk
[ 1706.979356] sd 1:0:0:0: [sdb] Starting disk
[ 1707.007303] e1000e 0000:00:19.0 em1: PHY Wakeup cause - Magic Packet
[ 1707.082162] e1000e 0000:00:19.0: irq 33 for MSI/MSI-X
[ 1707.286166] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[ 1707.288175] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[ 1707.311703] ata2.00: configured for UDMA/133
[ 1709.881038] e1000e: em1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[ 1710.154326] ata1.00: configured for UDMA/133
[ 1710.181758] PM: resume of devices complete after 3201.348 msecs
[ 1710.181881] Restarting tasks ... done.
[ 1710.182177] video LNXVIDEO:00: Restoring backlight state
[root@dell02 systemd]#
Thanks for any hint.
Joachim
