Suspend and Resume with ACPI
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"It took me quite a while to realize the real root cause of the VAIO - and probably many other machines - suspend/resume regressions, which were unearthed by the dyntick / clockevents patches," Thomas Gleixner explained regarding two patches for fixing suspend issues that Andrew Morton experienced with his VAIO laptop. He continued, "we disable a lot of ACPI/BIOS functionality during suspend, but we keep the lower idle C-states functionality active across suspend/resume. It seems that this causes trouble with certain BIOSes, but I assume that the problem is more wide spread and just not surfacing due to the various scenarios in which a machine goes into suspend/resume." Thomas concluded, "I really hope that this two patches finally set an end to the 'jinxed VAIO heisenbug series', which started when we removed the periodic tick with the clockevents/dyntick patches."
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