Re: [linux-pm] ACPI/ACPICA: resume hang (battery related)

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Sunday 22 November 2009, Maxim Levitsky wrote:
> I had just disabled the AC driver, yeah, got similar backtrace from acpi
> video driver.
> 
> Ok, enough, pattern is visible.
> The common point is that all backtraces lead to
> acpi_ex_acquire_global_lock
> 
> According to sources, it is only taken on access to ACPI hardware ranges
> that are marked as 'Lock'.
> 
> On my system only EC space is marked as such, thus this leads me to two
> conclusions.
> 
> Ether during suspend EC access isn't synced (this is, EC transaction is
> still pending),or that EC gets busted (suprise...) on resume or suspend,
> and first read/write cycle to/from it never finishes.
> 
> I am using hibernate cycles using 'reboot' mechanism.

OK, at this point I think it's better to file a bug report in the kernel
and assign it to ACPI (please add my address to the CC list in there).

Thanks,
Rafael