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Message-ID: <CAD8Lp44pQRYdw4cbfMt3uOSO23dzy_mWTt5T-Zjft08WWu_yUA@mail.gmail.com> Date: Tue, 16 Apr 2019 19:35:18 +0800 From: Daniel Drake <drake@...lessm.com> To: Ingo Molnar <mingo@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, Linux Kernel <linux-kernel@...r.kernel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Jian-Hong Pan <jian-hong@...lessm.com>, matt@...eblueprint.co.uk, Ard Biesheuvel <ard.biesheuvel@...aro.org>, hpa@...or.com, linux-efi@...r.kernel.org, Len Brown <len.brown@...el.com>, linux-tip-commits@...r.kernel.org, Endless Linux Upstreaming Team <linux@...lessm.com> Subject: Re: EFI reboot vs. ACPI reboot (was: Re: [tip:x86/urgent] x86/reboot, efi: Use EFI reboot for Acer TravelMate X514-51T) On Tue, Apr 16, 2019 at 4:20 PM Ingo Molnar <mingo@...nel.org> wrote: > I wanted to get a second opinion from the EFI folks for this whole > concept. On x86 we default to ACPI reboot on modern systems, and we > default to EFI reboot on modern EFI systems, via the > efi_reboot_required() method which keys off on acpi_gbl_reduced_hardware > to create a barrier for older ACPI systems. So if acpi_gbl_reduced_hardware is set, we are on a "modern EFI system", and EFI reboot is used. > It appears that Acer TravelMate X514-51T systems get marked as > 'acpi_gbl_reduced_hardware' which enables ACPI-reboot, but they require > EFI-reboot. We will double check, but in this case I believe the system is *not* marked as reduced hardware, which is why ACPI reboot is used. > Should we perhaps re-think the boundary between EFI-reboot and > ACPI-reboot systems? I.e. if the EFI runtime is enabled, shouldn't we > just use the EFI reboot method? I agree this is a good question. We also previously hit a similar issue for shutdown on Acer laptops which is still unresolved. https://marc.info/?l=linux-acpi&m=148857214431346&w=2 Daniel
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