From: Andrew Morton CONFIG_PM_TRACES scrogs your RTC. Mark it as experimental, and defaulting to `off'. Also beef up the help message a bit. Signed-off-by: Andrew Morton --- kernel/power/Kconfig | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff -puN kernel/power/Kconfig~pm_trace-is-bust kernel/power/Kconfig --- a/kernel/power/Kconfig~pm_trace-is-bust +++ a/kernel/power/Kconfig @@ -38,13 +38,22 @@ config PM_DEBUG config PM_TRACE bool "Suspend/resume event tracing" - depends on PM && PM_DEBUG && X86_32 - default y + depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL + default n ---help--- This enables some cheesy code to save the last PM event point in the RTC across reboots, so that you can debug a machine that just hangs during suspend (or more commonly, during resume). + To use this debugging feature you should attempt to suspend the machine, + then reboot it, then run + + dmesg -s 1000000 | grep 'hash matches' + + CAUTION: this option will cause your machine's real-time clock to be + set to an invalid time after a resume. + + config SOFTWARE_SUSPEND bool "Software Suspend" depends on PM && SWAP && (X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP) _