On Wed, 2007-07-25 at 13:04 -0700, David Brownell wrote: > As I recall, Mattia Dongili <malattia@xxxxxxxx> reported an error > with a Vaio laptop; it would wake immediately after entering STR. > It didn't reproduce for anyone else. But that was eventually tracked > down to a bug in iwl3945, which has since been fixed (yes?). I'm not sure if this might inform your thinking here but today I've just tracked down a similar issue on another Sony Vaio (PCG-SRX51) where S3 STR immediately wakes. I enabled ACPI_FUTURE_USAGE and called acpi_get_event_status() immediately upon resume (before the wake flag is cleared) and iterated each wake event. I discovered that the PM timer event is the reason the system resumes but so far haven't discovered why. I have a tenuous theory it could be related to the kernel timer using the ACPI PM Timer. I tried disabling that with the boot parameter 'nopmtimer' but that didn't help. To test this I'm currently building a kernel that disables the PM Timer wake event during suspend and re-enables it on resume, something the ACPI specification hints at in section 4.7.2.1. I'm not sure if this problem occurs on a wider range of systems than the Sony since at present, without a debug kernel with ACPI_FUTURE_USAGE and specific additional checks, there is no way to know the reason a system resumed. I'm planning on submitting a patch to log the wake event since it would greatly enhance our abilities to diagnose reasons behind these situations if the log showed it without a custom-kernel build. TJ. - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
