Re: pm_trace displays the wrong time from the RTC
- From: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
- Date: Tue, 31 Jul 2007 14:39:39 -0700
On Tue, 31 Jul 2007 17:20:10 -0400 Chuck Ebbert wrote:
When resuming, systems print this when booted on 07/31/07:
Date: 06/31/107
/drivers/base/power/trace.c::read_magic_time():
114 get_rtc_time(&time);
115 printk("Time: %2d:%02d:%02d Date: %02d/%02d/%02d\n",
116 time.tm_hour, time.tm_min, time.tm_sec,
117 time.tm_mon, time.tm_mday, time.tm_year);
include/asm-generic/rtc.h:
102 /*
103 * Account for differences between how the RTC uses the values
104 * and how they are defined in a struct rtc_time;
105 */
106 if (time->tm_year <= 69)
107 time->tm_year += 100;
108
109 time->tm_mon--;
That's this config option (read all of it):
config PM_TRACE
bool "Suspend/resume event tracing"
depends on PM_DEBUG && X86 && 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.
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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- pm_trace displays the wrong time from the RTC
- From: Chuck Ebbert
- pm_trace displays the wrong time from the RTC
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