Just in case it might help someone else, here's a wrapup of the final
status for my issues.
Intent : migrate from "Ubuntu Studio x64 10.10" to "Ubuntu Studio x64
12.10" (both installed, on distinct HDDs)
System specs : Tyan s2915 (non-E) motherboard, Tyan BIOS v3.00, MCP55
Pro chipset, dual Opteron 2212, NUMA + IOMMU + S3 S-state + C2/C3
C-states are enabled, cross-nodes RAM interleave + NVRAID are disabled,
NVidia 9600GT PCIe, SiliconImage 3124 eSATA controller PCI-X, 4xSATA II
Hitachi HDDs
>From info I've gathered here and there while searching for a solution, there
>seems to be two main "families" of suspend to RAM issues on NVidia chipsets :
1- suspend procedure hangs because some devices refuse to suspend =>
machine wakes back up after ~30 seconds timeout
2- suspend procedure finishes normally but some device concurrently
wakes machine up (this behavior sometimes only occurs randomly,
depending upon specific hardware) => machine's back up immediately
I experienced both problems above.
Here's what I believe were their root causes, with the workarounds (numbering
corresponds to that of issue above) :
1- kernel 3.5 differs from my previous kernel 2.6 by using by default,
an async device-suspend scheme, which revealed an async-suspend-request
management bug in NVidia's chipset driver (sata_nv), diag'ed in kernel
bug #48951 opened by Joe Sapp (poster in this thread)
=> only workaround at the moment : use udev rule given in kernel bug
#48951 thread, comment #20
2- kernel 3.5 also differs from my previous kernel 2.6 by granting by
default, USB devices the right to wake machine up from suspend
(/proc/acpi/wakeup)
=> most frequently described workaround : unload driver of offending
device before suspending (see for example :
https://wiki.archlinux.org/index.php/Pm-
utils#Standby_.2F_Suspend_to_RAM)
=> a workaround that I find less "invasive" : disable wake-up
"permission" for offending devices before suspending, by means of a pm-
utils hook (see : http://askubuntu.com/questions/152403/how-do-i-make-
changes-to-proc-acpi-wakeup-permanent)
Hope it can help.
Eric
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https://bugs.launchpad.net/bugs/1065840
Title:
Suspend wakes right back up
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