Hang when booting with verbose ACPI debugging

[Andriy Gapon]

on 12/09/2010 22:12 Bruce Cran said the following:
> Hi,
> 
> I'm running -current from a few days ago and decided to see if I could
> figure out if I should be getting more Cx levels after enabling
> C3/C6/C7 in the BIOS. However when setting:
> 
> debug.acpi.layer="ACPI_ALL_DRIVERS"
> debug.acpi.level="ACPI_LV_ALL"
> 
> the system hangs at the Entropy harvesting line (I know those debug
> settings are too much for debugging Cx support). It also hung when I
> booted into single-user mode and tried to list the debug.acpi sysctls.
> Although the system doesn't respond to keypresses, the system isn't
> totally locked up: pressing the power button a couple of times triggers
> the message that the system's not ready to switch into S5 mode.

Well, can't really tell what's going on, but consider a possibility that the
system is just very busy writing out all the debugging info.
All in all, this needs further investigation.

-- 
Andriy Gapon