Commit d60cd063 authored Oct 30, 2020 by Kai-Heng Feng Committed by Rafael J. Wysocki Nov 10, 2020

PM: ACPI: reboot: Use S5 for reboot

After reboot, it's not possible to use hotkeys to enter BIOS setup
and boot menu on some HP laptops.

BIOS folks identified the root cause is the missing _PTS call, and
BIOS is expecting _PTS to do proper reset.

Using S5 for reboot is default behavior under Windows, "A full
shutdown (S5) occurs when a system restart is requested" [1], so
let's do the same here.

[1] https://docs.microsoft.com/en-us/windows/win32/power/system-power-states



Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent f8394f23

kernel/reboot.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -244,6 +244,8 @@ void migrate_to_reboot_cpu(void)
		void kernel_restart(char *cmd)
		{
		kernel_restart_prepare(cmd);
		if (pm_power_off_prepare)
		pm_power_off_prepare();
		migrate_to_reboot_cpu();
		syscore_shutdown();
		if (!cmd)

Admin message