[lkml]   [2020]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH] PM / sleep: Add pm_debug_messages boot command control
Debug messages from the system suspend/hibernation infrastructure
is disabled by default, and can only be enabled after the system
has boot up via /sys/power/pm_debug_messages. This makes the hibernation
resume hard to track as it involves system boot up across hibernation.
There's no chance for software_resume() to track the resume process,

Turning on the pm_debug_messages during boot up by appending

Cc: "Rafael J. Wysocki" <>
Cc: Len Brown <>
Cc: Andy Shevchenko <>
Signed-off-by: Chen Yu <>
kernel/power/main.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 69b7a8aeca3b..1da3d7c15e03 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -535,6 +535,13 @@ static ssize_t pm_debug_messages_store(struct kobject *kobj,


+static int __init pm_debug_message_setup(char *str)
+ pm_debug_messages_on = true;
+ return 1;
+__setup("pm_debug_message", pm_debug_message_setup);
* __pm_pr_dbg - Print a suspend debug message to the kernel log.
* @defer: Whether or not to use printk_deferred() to print the message.
 \ /
  Last update: 2020-03-27 12:14    [W:0.052 / U:0.788 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site