From db96a75946d3a2a41092c83992e65f727cd35529 Mon Sep 17 00:00:00 2001 From: Chen Yu Date: Thu, 2 Apr 2020 15:56:52 +0800 Subject: PM: sleep: Add pm_debug_messages kernel command line option Debug messages from the system suspend/hibernation infrastructure are 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, for example. Add a kernel command line option to set pm_debug_messages during boot up. Signed-off-by: Chen Yu [ rjw: Subject & changelog ] Signed-off-by: Rafael J. Wysocki --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation/admin-guide') diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 4e3885e38179..df2c2b97f417 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3719,6 +3719,9 @@ Override pmtimer IOPort with a hex value. e.g. pmtmr=0x508 + pm_debug_messages [SUSPEND,KNL] + Enable suspend/resume debug messages during boot up. + pnp.debug=1 [PNP] Enable PNP debug messages (depends on the CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time -- cgit v1.2.3