linux-kernel - Re: [PATCH] PM / reboot: Use S5 for reboot

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Date:   Tue, 10 Nov 2020 19:02:18 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        Mike Rapoport <rppt@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Kees Cook <keescook@...omium.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM / reboot: Use S5 for reboot

On Fri, Oct 30, 2020 at 8:07 AM Kai-Heng Feng
<kai.heng.feng@...onical.com> wrote:
>
> 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@...onical.com>
> ---
>  kernel/reboot.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index e7b78d5ae1ab..7e5aa1f78693 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -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)
> --

Applied as 5.11 material with a minor edit in the subject, thanks!