Re: Occasional (too common) suspend problem

On Fri, 2011-01-21 at 13:23 +0800, Lin Ming wrote:

---------- Forwarded message ----------
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, Jan 21, 2011 at 12:50 PM
Subject: [linux-pm] Occasional (too common) suspend problem
To: "Rafael J. Wysocki" <redacted>, Len Brown <lenb@kernel.org>,
Jeff Chua [off-list ref], ACPI Devel Maling List
[off-list ref], Linux-pm mailing list
[off-list ref]


So I have one remaining problem on my nasty EeePC problem child
computer, and this one I cannot bisect simply because it's so flaky.

The exact same kernel may suspend and resume many many times in a row,
and then I reboot it, and it hangs on the first suspend. Very
occasionally the machine comes back when I press a key, and resumes
ok. Most of the time it does not - it's just dead to the world, and
there are no logs to go by. I even tried pm_trace, and that didn't get
me anywhere, although I once got a hash match:

 hash matches drivers/base/power/main.c:555

which is the last part of a deivice_resume(), but none of the devices
matched, so that didn't really give any information at all.

So I have very little to go on.

However, at least one time when it failed and came back (remember:
very rare), I did get that suspend sequence printouts logged. Here's a
_good_ suspend:

 ...
 [   79.596367] PM: Saving platform NVS memory
 [   79.596378] Disabling non-boot CPUs ...
 [   79.700053] CPU 1 is now offline
 [   79.700565] PM: Restoring platform NVS memory
 [   79.700565] Enabling non-boot CPUs ...
 [   79.700565] Booting Node 0 Processor 1 APIC 0x1
 [   79.597894] Initializing CPU#1
 ...

and here's the one that failed and then ended up coming back on a keypress:

 ...
 [   54.628375] PM: Saving platform NVS memory
 [   54.628387] Disabling non-boot CPUs ...
 [   63.554966] ACPI Exception: AE_BAD_PARAMETER, Returned by Handler
for [EmbeddedControl] (20110112/evregion-474)
 [   63.554992] ACPI Error: Method parse/execution failed
[\_SB_.PCI0.SBRG.EC0_.RCTP] (Node f5c2dea0), AE_BAD_PARAMETER
(20110112/psparse-536)
 [   63.555022] ACPI Error: Method parse/execution failed
[\_TZ_.RTMP] (Node f5c32fa8), AE_BAD_PARAMETER (20110112/psparse-536)
 [   63.555047] ACPI Error: Method parse/execution failed
[\_TZ_.TZ00._TMP] (Node f5c34018), AE_BAD_PARAMETER
(20110112/psparse-536)
 [   63.555079] Thermal: failed to read out thermal zone 0
 [   63.556361] CPU 1 is now offline
 [   63.556944] PM: Restoring platform NVS memory
 [   63.556944] Enabling non-boot CPUs ...
 [   63.556944] Booting Node 0 Processor 1 APIC 0x1
 [   63.556279] Initializing CPU#1
 ...

which really doesn't tell me much, except that clearly something in
ACPI-land is unhappy, and it looks thermal-related (that last error
message comes from thermal_zone_device_update()).

Any ideas?

Does revert bba63a29(ACPICA: Implicit notify support) help?

Lin Ming

                   Linus
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