linux-kernel - [PATCH 04/11] Documentation: PM: amd-pstate: introducing recommended reboot requirement during driver switch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <cba2303c23bb579299f7c268b49286e62782893e.1715065568.git.perry.yuan@amd.com>
Date: Tue, 7 May 2024 15:15:20 +0800
From: Perry Yuan <perry.yuan@....com>
To: <rafael.j.wysocki@...el.com>, <Mario.Limonciello@....com>,
	<viresh.kumar@...aro.org>, <Ray.Huang@....com>, <gautham.shenoy@....com>,
	<Borislav.Petkov@....com>
CC: <Alexander.Deucher@....com>, <Xinmei.Huang@....com>,
	<Xiaojian.Du@....com>, <Li.Meng@....com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 04/11] Documentation: PM: amd-pstate: introducing recommended reboot requirement during driver switch

It is highly recommended to reboot the system when switching between the 'amd-pstate'
and 'acpi-cpufreq' drivers to avoid potential unexpected issues.
Rebooting will ensure that the system properly applies the changes and allows for a
seamless transition between the drivers.

Reported-by : Reported-by: Artem S. Tashkinov <aros@....com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=215801
Signed-off-by: Perry Yuan <perry.yuan@....com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 1e0d101b020a..2695feec1baa 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -299,6 +299,10 @@ module which supports the new AMD P-States mechanism on most of the future AMD
 platforms. The AMD P-States mechanism is the more performance and energy
 efficiency frequency management method on AMD processors.
 
+When users attempt to switch from the acpi-cpufreq driver to the amd-pstate driver's working mode,
+it is recommended to reboot the system. This is to ensure that any low-level power management
+control states are properly switched to pstate control. By rebooting, the firmware can initialize
+with optimal power states, reducing the likelihood of unexpected issues.
 
 ``amd-pstate`` Driver Operation Modes
 ======================================
-- 
2.34.1