Comment # 30 on bug 1137748 from Hubert Mantel

(In reply to Takashi Iwai from comment #29)
> The original issue seems to be some spurious wakeup immediately after the
> suspend.  e.g. the dmesg in comment 1 shows:
> 
> [  813.684339] ACPI: Preparing to enter system sleep state S3
> [  813.684637] PM: Saving platform NVS memory
> [  813.684645] Disabling non-boot CPUs ...
> .....
> [  813.718652] ACPI: Waking up from system sleep state S3
> .....

But in this case the system should come up completely again, no?

If I try to suspend to RAM, the system *seems* to shut down correctly. Display
goes off and I can even hear the hard disk spin down. It is just that power is
not switched off (board fans continue to run and power LED stays lid).

Only after pressing some key the system will come up again in full. Btw, this
works perfectly fine, network still is up correctly.

> It's possibly a BIOS bug that surfaced on the recent system by some reason
> (likely ACPI code changes that take effect).

Well, unfortunately there is no newer BIOS version available.

> Check /proc/acpi/wakeup contents and try to disable the unnecessary wakeup
> sources.

How do I identify an "unnecessary wakeup source" and how do I remove it? Sorry,
I'm a mere mortal user in this respect :)

mantel@Terra:~ [0]> cat /proc/acpi/wakeup
Device  S-state   Status   Sysfs node
PS2K      S3    *enabled   pnp:00:05
PS2M      S3    *disabled
P0P1      S4    *disabled
USB1      S3    *disabled
USB2      S3    *disabled
USB3      S3    *disabled
USB4      S3    *disabled
USB5      S3    *disabled
USB6      S3    *disabled
USB7      S3    *disabled
RP01      S4    *disabled  pci:0000:00:1c.0
PXSX      S4    *disabled
RP02      S4    *disabled
PXSX      S4    *disabled
RP03      S4    *disabled
PXSX      S4    *disabled
RP04      S4    *disabled
PXSX      S4    *disabled
RP05      S4    *disabled
PXSX      S4    *disabled
RP06      S4    *disabled  pci:0000:00:1c.5
PXSX      S4    *disabled  pci:0000:02:00.0
RP07      S4    *disabled  pci:0000:00:1c.6
PXSX      S4    *disabled  pci:0000:04:00.0
RP08      S4    *disabled  pci:0000:00:1c.7
PXSX      S4    *enabled   pci:0000:05:00.0
PEG0      S4    *disabled
PEGP      S4    *disabled
PEG1      S4    *disabled
PEG2      S4    *disabled
PEG3      S4    *disabled
GLAN      S4    *disabled
EHC1      S4    *enabled   pci:0000:00:1d.0
EHC2      S4    *enabled   pci:0000:00:1a.0
XHC       S4    *enabled   pci:0000:00:14.0
HDEF      S4    *disabled  pci:0000:00:1b.0
PWRB      S3    *enabled   platform:PNP0C0C:00