Date: Tue, 16 Mar 2021 21:18:08 -0700 From: Xin Li <delphij@FreeBSD.org> To: d@delphij.net, freebsd-current@freebsd.org Cc: jkim@freebsd.org, cem@FreeBSD.org, marcel@freebsd.org, Warner Losh <imp@FreeBSD.org>, byuu@tutanota.com, interloper255@gmail.com Subject: Re: ThinkPad: reboots after successful shutdown -p Message-ID: <cde330ac-d254-fd2d-760a-cfb63c5cd058@FreeBSD.org> In-Reply-To: <b22bad03-238f-ad74-e8ce-9c02287d4cd4@delphij.net> References: <b22bad03-238f-ad74-e8ce-9c02287d4cd4@delphij.net>
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On 11/17/19 23:14, Xin Li wrote: > Hi, > > I recently noticed that if I do a 'shutdown -p' from -CURRENT, the > system would shut down and seemingly powered off, then it would restart > after about 5-10 seconds. > > Is this a known issue? Arguably this is not necessarily a FreeBSD > issue, but it seems that the Windows 10 installation doesn't have the > problem, so I guess there might be some difference between our and > Windows's shutdown sequence. I've found a workaround for this, for the record, setting hw.efi.poweroff=0 would make the laptop to correctly shutdown. However I don't see anything wrong with sys/dev/efidev/efirt.c's implementation of EFI shutdown; it appears to be essentially the same as implemented in command_poweroff() in stand/efi/loader/main.c, but 'poweroff' would work just fine in loader.efi. Can someone familiar with the code shed me some light here? :-) It looks like what Linux did was to prefer ACPI S5, unless it's not available or the system have HW_REDUCED flag in FADT, so if we do something similar it would fix the issue for me, but according to bugs.freebsd.org/233998 that's not the case for at least Conor's system (_S5 appears to be in the ACPI dump), so I think it's something else... Cheers,
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