https://bugzilla.kernel.org/show_bug.cgi?id=16396


Bjorn Helgaas <bjorn.helg...@hp.com> changed:

           What    |Removed                     |Added
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                 CC|                            |a...@fitzenreiter.de




--- Comment #31 from Rafael J. Wysocki <r...@sisk.pl>  2010-07-21 20:22:50 ---
Patch : https://patchwork.kernel.org/patch/113108/
Handled-By : Rafael J. Wysocki <r...@sisk.pl>

--- Comment #32 from Bjorn Helgaas <bjorn.helg...@hp.com>  2010-07-26 17:11:43 
---
I'm still hopeful that we can find a generic solution that doesn't require
a kernel argument, so here are some breadcrumbs for future investigation.

Arne Fitzenreiter reports in bug 9905 comment 108 that he has a similar
laptop (Averatec 2400), and suspend to disk and ram works correctly under
Windows XP.  With Ubuntu 10.04, suspend to ram is works but suspend to
disk fails.

I think bug 9905 is caused by the fact that the BIOS put some PCI devices
at addresses that conflict with a PNP0C02 motherboard device.  In this case,
Windows moves the PCI devices, but Linux currently does not (see bug 9905
comment 110).  The Linux workaround is to boot with "reserve=", which
forces us to move the PCI devices.

I hoped that a fix for bug 9905 would also fix this bug, but based on
the following observations by Tomas, that doesn't seem likely:

  <2.6.34 "reserve=0xffb00000,0x100000 acpi_sleep=nonvs" suspends OK
  <2.6.34 "pci=use_crs acpi_sleep=nonvs" suspends OK
   2.6.34 "reserve=0xffb00000,0x100000" suspends OK
   2.6.35 "reserve=0xffb00000,0x100000" hangs during resume

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