The patch titled
PM: Add pm_trace switch (doc)
has been added to the -mm tree. Its filename is
pm-add-pm_trace-switch-doc.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PM: Add pm_trace switch (doc)
From: "Rafael J. Wysocki" <rjw@xxxxxxx>
Well, this is the most difficult part. ;-)
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
Documentation/power/interface.txt | 15 +++++++++++++++
1 files changed, 15 insertions(+)
diff -puN Documentation/power/interface.txt~pm-add-pm_trace-switch-doc Documentation/power/interface.txt
--- a/Documentation/power/interface.txt~pm-add-pm_trace-switch-doc
+++ a/Documentation/power/interface.txt
@@ -52,3 +52,18 @@ suspend image will be as small as possib
Reading from this file will display the current image size limit, which
is set to 500 MB by default.
+
+/sys/power/pm_trace controls the code which saves 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). Namely, the RTC is only
+used to save the last PM event point if this file contains '1'. Initially it
+contains '0' which may be changed to '1' by writing a string representing a
+nonzero integer into it.
+
+To use this debugging feature you should attempt to suspend the machine, then
+reboot it and run
+
+ dmesg -s 1000000 | grep 'hash matches'
+
+CAUTION: Using it will cause your machine's real-time (CMOS) clock to be
+set to a random invalid time after a resume.
_
Patches currently in -mm which might be from rjw@xxxxxxx are
origin.patch
pm-define-pm_event_prethaw.patch
pm-pci-and-ide-handle-pm_event_prethaw.patch
pm-video-drivers-and-pm_event_prethaw.patch
pm-usb-hcds-use-pm_event_prethaw.patch
pm-usb-hcds-use-pm_event_prethaw-fix.patch
pm-issue-pm_event_prethaw.patch
swsusp-write-timer.patch
swsusp-write-speedup.patch
swsusp-read-timer.patch
swsusp-read-speedup.patch
swsusp-read-speedup-fix.patch
swsusp-read-speedup-cleanup.patch
swsusp-read-speedup-cleanup-2.patch
swsusp-read-speedup-fix-fix-2.patch
swsusp-clean-up-browsing-of-pfns.patch
swsusp-struct-snapshot_handle-cleanup.patch
make-swsusp-avoid-memory-holes-and-reserved-memory-regions-on-x86_64.patch
disable-cpu-hotplug-during-suspend-2.patch
swsusp-fix-mark_free_pages.patch
swsusp-reorder-memory-allocating-functions.patch
swsusp-fix-alloc_pagedir.patch
clean-up-suspend-header.patch
change-the-name-of-pagedir_nosave.patch
swsusp-introduce-some-helpful-constants.patch
swsusp-introduce-memory-bitmaps.patch
swsusp-use-memory-bitmaps-during-resume.patch
swsusp-use-memory-bitmaps-during-resume-fix.patch
swsusp-use-suspend_console.patch
pm-make-it-possible-to-disable-console-suspending.patch
pm-make-it-possible-to-disable-console-suspending-fix.patch
make-it-possible-to-disable-serial-console-suspend.patch
i386-detect-clock-skew-during-suspend.patch
pm-add-pm_trace-switch.patch
pm-add-pm_trace-switch-doc.patch
reiserfs-make-sure-all-dentries-refs-are-released-before-calling-kill_block_super-try-2.patch
ide-reprogram-disk-pio-timings-on-resume.patch
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